fix(llm-security): scanner false-positives/negatives — trigger, toxic-flow, policy-loader (#38-#41,#57,#26)
#38 toxic-flow matched trifecta-leg keywords with bare includes(), so substrings ('url' in 'curl', 'key' in 'monkey', 'auth' in 'author') fabricated CRITICAL trifectas on benign components; now word-boundary matched. #40 TRG-broad fired HIGH on a bare any/all/every anywhere ('fix any lint errors'); the universal-claim regex now requires genuine universal phrasing. #41 TRG-baiting substring-matched ('any file' in 'many files'); now boundary-anchored. #39 the broad-name list missed multi-char generic names (helper/assistant/auto/general/agent/tool); widened coherently so it does not reintroduce #40. #57 the '(recovered from obfuscation)' label compared raw against a lowercased normal form, firing on any uppercase char; now gated on an explicit decode-changed flag. #26 (same file) getPolicyValue used 'key in sectionObj' with no type guard, so a scalar section override in policy.json (e.g. {"injection":"block"}) threw an uncaught TypeError; now guarded to fall back to the default. Suite 1931/0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TcQyMTQfyrsAapaCMPxTtQ
This commit is contained in:
parent
196517f38a
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6 changed files with 339 additions and 13 deletions
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@ -81,6 +81,7 @@ const DEFAULT_POLICY = Object.freeze({
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],
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broad_single_words: [
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'run', 'do', 'go', 'help', 'fix', 'use', 'get', 'set', 'all', 'any', 'it', 'this', 'that',
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'helper', 'assistant', 'auto', 'general', 'agent', 'tool',
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],
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},
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// SIG — known-bad-identity signature engine. Toggle families or point at a
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@ -180,7 +181,10 @@ export function loadPolicy(projectRoot) {
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export function getPolicyValue(section, key, defaultValue, projectRoot) {
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const policy = loadPolicy(projectRoot);
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const sectionObj = policy[section];
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if (sectionObj && key in sectionObj) return sectionObj[key];
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// v7.8.3 (#26): a scalar section override in policy.json (e.g.
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// {"injection": "block"}) survives deepMerge — guard before `in` so it
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// falls back to the default instead of throwing a TypeError.
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if (sectionObj && typeof sectionObj === 'object' && key in sectionObj) return sectionObj[key];
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return defaultValue;
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}
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@ -64,6 +64,26 @@ const EXFIL_KEYWORDS = [
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'network', 'api', 'endpoint', 'transfer', 'exfil',
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];
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/**
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* Compile a keyword into a word-boundary-anchored regex (#38), so 'url' no
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* longer matches inside 'curl', 'key' inside 'monkey', 'auth' inside
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* 'author', or 'api' inside 'rapidly'. Boundary guards are only applied
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* where the keyword edge is a word character (so '.env' still matches
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* 'config.env'); a trailing plural 's' is allowed ('credentials', 'tokens').
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*/
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function keywordToRegex(kw) {
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const escaped = String(kw).split(/\s+/)
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.map(w => w.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'))
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.join('\\s+');
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const lead = /^[a-z0-9_$]/i.test(kw) ? '(?<![a-z0-9_$])' : '';
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const trail = /[a-z0-9_]$/i.test(kw) ? 's?(?![a-z0-9_])' : '';
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return new RegExp(lead + escaped + trail, 'i');
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}
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const INPUT_KEYWORD_MATCHERS = INPUT_KEYWORDS.map(kw => ({ kw, re: keywordToRegex(kw) }));
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const SENSITIVE_KEYWORD_MATCHERS = SENSITIVE_KEYWORDS.map(kw => ({ kw, re: keywordToRegex(kw) }));
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const EXFIL_KEYWORD_MATCHERS = EXFIL_KEYWORDS.map(kw => ({ kw, re: keywordToRegex(kw) }));
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// ---------------------------------------------------------------------------
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// Hook guard patterns — known hooks that mitigate exfil paths
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// ---------------------------------------------------------------------------
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@ -234,9 +254,9 @@ function classifyTrifectaLegs(components, priorResults, mcpPresent) {
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comp.inputEvidence.push('$ARGUMENTS in command body');
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}
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// Keyword-based
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for (const kw of INPUT_KEYWORDS) {
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if (comp.description.includes(kw) || comp.body.includes(kw)) {
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// Keyword-based (word-boundary matched, #38)
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for (const { kw, re } of INPUT_KEYWORD_MATCHERS) {
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if (re.test(comp.description) || re.test(comp.body)) {
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comp.hasInputSurface = true;
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comp.inputEvidence.push(`keyword "${kw}"`);
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break;
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@ -267,8 +287,8 @@ function classifyTrifectaLegs(components, priorResults, mcpPresent) {
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}
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}
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for (const kw of SENSITIVE_KEYWORDS) {
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if (comp.description.includes(kw) || comp.body.includes(kw)) {
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for (const { kw, re } of SENSITIVE_KEYWORD_MATCHERS) {
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if (re.test(comp.description) || re.test(comp.body)) {
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comp.hasDataAccess = true;
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comp.accessEvidence.push(`keyword "${kw}"`);
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break;
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@ -290,8 +310,8 @@ function classifyTrifectaLegs(components, priorResults, mcpPresent) {
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comp.exfilEvidence.push(`delegation: ${matched.join(', ')} (can spawn capable sub-agents)`);
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}
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for (const kw of EXFIL_KEYWORDS) {
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if (comp.description.includes(kw) || comp.body.includes(kw)) {
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for (const { kw, re } of EXFIL_KEYWORD_MATCHERS) {
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if (re.test(comp.description) || re.test(comp.body)) {
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comp.hasExfilSink = true;
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comp.exfilEvidence.push(`keyword "${kw}"`);
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break;
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@ -44,10 +44,20 @@ const DEFAULT_BUILTIN_NAMES = [
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const DEFAULT_BROAD_SINGLE_WORDS = [
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'run', 'do', 'go', 'help', 'fix', 'use', 'get', 'set', 'all', 'any', 'it', 'this', 'that',
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'helper', 'assistant', 'auto', 'general', 'agent', 'tool',
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];
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// Bare universal-applicability claim words used only for the TRG-broad combo.
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const UNIVERSAL_CLAIM_RE = /\b(any|all|every|everything|anything|universal|whenever|always|no matter what)\b/i;
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// Universal-applicability claim used only for the TRG-broad combo. A bare
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// quantifier inside a scoped noun phrase ("any lint errors", "all tests") is
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// NOT a universal claim (#40) — the quantifier must pair with a universal
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// noun ("any request"), an unbounded pronoun ("anything"), or an
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// unconditional-invocation phrase ("always invoke", "no matter what").
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const UNIVERSAL_CLAIM_RE = new RegExp(
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'\\b(?:anything|everything|no matter what|universal(?:ly)?'
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+ '|(?:any|all|every)\\s+(?:request|task|prompt|question|message|input|situation|scenario|purpose|context|case|time|user)s?'
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+ '|always\\s+(?:use|invoke|activate|apply|run|trigger)'
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+ '|whenever\\s+(?:the\\s+user|you|asked|possible)'
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+ ')\\b', 'i');
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// Invisible / zero-width characters used to split keywords (ZWSP, ZWNJ, ZWJ,
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// word-joiner, BOM/zero-width-no-break-space).
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@ -76,6 +86,22 @@ function normalizeText(s) {
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return normalizeForScan(foldHomoglyphs(noZeroWidth)).toLowerCase();
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}
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/**
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* Compile a baiting phrase into a word-boundary-anchored regex (#41), so
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* "any file" no longer matches inside "many files" nor "all files" inside
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* "install files". Boundary anchors are only applied where the phrase edge
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* is a word character; internal whitespace matches flexibly.
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*/
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function phraseToRegex(phrase) {
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const trimmed = String(phrase).trim();
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const escaped = trimmed.split(/\s+/)
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.map(w => w.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'))
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.join('\\s+');
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const lead = /^[a-z0-9]/i.test(trimmed) ? '\\b' : '';
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const trail = /[a-z0-9]$/i.test(trimmed) ? '\\b' : '';
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return new RegExp(lead + escaped + trail, 'i');
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}
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/**
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* Scan command/agent/skill definitions for trigger/activation abuse.
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*
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@ -95,6 +121,9 @@ export async function scan(targetPath, discovery) {
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.map(n => String(n).toLowerCase());
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const broadWords = (getPolicyValue('trg', 'broad_single_words', DEFAULT_BROAD_SINGLE_WORDS, targetPath) || [])
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.map(w => String(w).toLowerCase());
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const baitingMatchers = baitingPhrases
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.filter(Boolean)
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.map(p => ({ phrase: p, re: phraseToRegex(p) }));
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for (const fileInfo of discovery.files) {
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if (!isTriggerFile(fileInfo.relPath)) continue;
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@ -111,9 +140,15 @@ export async function scan(targetPath, discovery) {
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const nameLower = name.toLowerCase();
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const rawDesc = typeof fm.description === 'string' ? fm.description : '';
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const normDesc = normalizeText(rawDesc);
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const plainDesc = rawDesc.toLowerCase();
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const fileType = fileTypeOf(fileInfo.relPath);
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const isBroadName = broadWords.includes(nameLower) || nameLower.length <= 2;
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// Broad name: a listed generic word, a very short name, or a compound
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// name made entirely of generic words ("helper-agent") (#39).
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const nameTokens = nameLower.split(/[^a-z0-9]+/).filter(Boolean);
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const isBroadName = broadWords.includes(nameLower)
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|| nameLower.length <= 2
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|| (nameTokens.length > 0 && nameTokens.every(t => broadWords.includes(t)));
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const hasUniversalClaim = UNIVERSAL_CLAIM_RE.test(normDesc);
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// TRG-shadow — name collides with a built-in command/tool.
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@ -147,14 +182,19 @@ export async function scan(targetPath, discovery) {
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}
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// TRG-baiting — maximally-activating phrases in the (decoded) description.
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const matched = baitingPhrases.filter(p => p && normDesc.includes(p));
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const matched = baitingMatchers.filter(m => m.re.test(normDesc)).map(m => m.phrase);
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// "(recovered from obfuscation)" only when a matched phrase is NOT
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// findable in the plain lowercased raw text — i.e. the decode pipeline
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// actually recovered it (#57). Mere case differences do not count.
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const recovered = baitingMatchers.some(m =>
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m.re.test(normDesc) && !m.re.test(plainDesc));
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if (matched.length > 0) {
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findings.push(finding({
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scanner: 'TRG',
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severity: SEVERITY.MEDIUM,
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title: `Activation baiting phrase in ${fileType} description`,
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description: `The ${fileType} "${name}" description uses maximally-activating phrasing that baits the `
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+ `model into invoking it indiscriminately${rawDesc === normDesc ? '' : ' (recovered from obfuscation)'}.`,
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+ `model into invoking it indiscriminately${recovered ? ' (recovered from obfuscation)' : ''}.`,
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file: fileInfo.relPath,
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evidence: `phrases: ${matched.join(', ')}`,
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owasp: 'LLM06',
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@ -129,6 +129,14 @@ describe('policy-loader', () => {
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const defaults = getDefaultPolicy();
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assert.equal(defaults.trifecta.escalation_window, 5);
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});
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it('getPolicyValue survives a scalar section override without throwing (#26)', () => {
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// A user writing {"injection": "block"} (scalar instead of object) must
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// not crash the "key in sectionObj" lookup with a TypeError.
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writeFileSync(POLICY_FILE, JSON.stringify({ injection: 'block' }));
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const val = getPolicyValue('injection', 'mode', 'warn', TEST_ROOT);
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assert.equal(val, 'warn');
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});
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});
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// ---------------------------------------------------------------------------
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85
tests/scanners/toxic-flow-keyword-boundary.test.mjs
Normal file
85
tests/scanners/toxic-flow-keyword-boundary.test.mjs
Normal file
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@ -0,0 +1,85 @@
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// toxic-flow-keyword-boundary.test.mjs — Regression tests for TFA keyword
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// matching (v7.8.3, finding #38): trifecta legs were classified via plain
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// substring matching, so benign words containing a keyword as a substring
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// ('curl' > 'url', 'monkey'/'keyword' > 'key', 'author' > 'auth',
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// 'rapidly' > 'api') fabricated all three legs and a CRITICAL direct
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// trifecta on read-only components. Keywords must match on word boundaries.
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import { describe, it, beforeEach } from 'node:test';
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import assert from 'node:assert/strict';
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import { join } from 'node:path';
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import { mkdtempSync, mkdirSync, writeFileSync, rmSync } from 'node:fs';
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import { tmpdir } from 'node:os';
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import { resetCounter } from '../../scanners/lib/output.mjs';
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import { scan } from '../../scanners/toxic-flow-analyzer.mjs';
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/** Build a temp plugin dir with the given commands/*.md files. */
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function makePlugin(files) {
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const dir = mkdtempSync(join(tmpdir(), 'tfa-boundary-'));
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mkdirSync(join(dir, 'commands'), { recursive: true });
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for (const [name, content] of Object.entries(files)) {
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writeFileSync(join(dir, 'commands', name), content);
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}
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return dir;
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}
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describe('toxic-flow-analyzer: keyword word boundaries (#38)', () => {
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beforeEach(() => {
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resetCounter();
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});
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it('does not fabricate trifecta legs from substring-only matches (curly/monkey/author/rapidly)', async () => {
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const dir = makePlugin({
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'release-notes.md': [
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'---',
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'name: release-notes',
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'description: Formats release notes written by the author using curly braces and monkey-patched templates.',
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'---',
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'',
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'# release-notes',
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'',
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'The author reviews monkey-patched curly-brace templates rapidly.',
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'No tools, read-nothing formatting helper.',
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'',
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].join('\n'),
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});
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try {
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const result = await scan(dir, { files: [] }, {});
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assert.equal(result.status, 'ok');
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assert.equal(
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result.findings.length, 0,
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`Expected 0 findings for a benign component, got: ${result.findings.map(f => `${f.title} [${f.severity}]`).join('; ')}`,
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);
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} finally {
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rmSync(dir, { recursive: true, force: true });
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}
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});
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it('still detects a direct trifecta from genuine keywords (incl. plural forms)', async () => {
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const dir = makePlugin({
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'sync.md': [
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'---',
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'name: sync',
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'description: Takes user input, reads stored credentials, and uploads results to a webhook endpoint.',
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'---',
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'',
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'# sync',
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'',
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'Reads credentials and sends them to the configured webhook.',
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'',
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].join('\n'),
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});
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try {
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const result = await scan(dir, { files: [] }, {});
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assert.equal(result.status, 'ok');
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const direct = result.findings.filter(f => f.title.startsWith('Lethal trifecta:'));
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assert.ok(
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direct.length >= 1,
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`Expected a direct trifecta finding, got: ${result.findings.map(f => f.title).join('; ')}`,
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);
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assert.equal(direct[0].severity, 'critical', 'unguarded direct trifecta should be CRITICAL');
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} finally {
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rmSync(dir, { recursive: true, force: true });
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}
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});
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});
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@ -157,6 +157,175 @@ describe('trigger-scanner: orchestrator registration', () => {
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});
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});
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// ---------------------------------------------------------------------------
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// v7.8.3 regressions — scoped quantifiers, phrase boundaries, generic names,
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// and the "(recovered from obfuscation)" label (#39/#40/#41/#57)
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// ---------------------------------------------------------------------------
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/** Build a temp dir with the given relative-path -> content markdown files. */
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function makeTriggerDir(files) {
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const dir = mkdtempSync(join(tmpdir(), 'trg-v783-'));
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for (const [rel, content] of Object.entries(files)) {
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const abs = join(dir, rel);
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mkdirSync(abs.replace(/\/[^/]+$/, ''), { recursive: true });
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writeFileSync(abs, content);
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}
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return dir;
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}
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async function scanDir(dir) {
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resetCounter();
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const discovery = await discoverFiles(dir);
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return scan(dir, discovery);
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}
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describe('trigger-scanner: scoped quantifiers do not trip TRG-broad (#40)', () => {
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it('broad name "fix" with a scoped noun phrase ("any lint errors") produces 0 findings', async () => {
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const dir = makeTriggerDir({
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'commands/fix.md':
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'---\nname: fix\ndescription: Fix any lint errors reported in the current file and re-run the linter on all tests.\n---\n\n# fix\n',
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});
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try {
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const result = await scanDir(dir);
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assert.equal(result.status, 'ok');
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assert.equal(
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result.findings.length, 0,
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`Expected 0 findings, got: ${result.findings.map(f => f.title).join('; ')}`,
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);
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} finally {
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rmSync(dir, { recursive: true, force: true });
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}
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});
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it('broad name with a genuine universal-applicability claim still trips TRG-broad at HIGH', async () => {
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const dir = makeTriggerDir({
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'commands/fix.md':
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'---\nname: fix\ndescription: Use this for any request, in every situation, no matter what the user asks.\n---\n\n# fix\n',
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});
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try {
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const result = await scanDir(dir);
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const broad = result.findings.filter(f => /broad/i.test(f.title));
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assert.ok(broad.length >= 1, `Expected a broad-trigger finding, got: ${result.findings.map(f => f.title).join('; ')}`);
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assert.ok(broad.every(f => f.severity === 'high'), 'broad-trigger findings should be HIGH');
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} finally {
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rmSync(dir, { recursive: true, force: true });
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}
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});
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});
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describe('trigger-scanner: baiting phrases use word boundaries (#41)', () => {
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it('"many files" / "install files" do not match "any file" / "all files"', async () => {
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const dir = makeTriggerDir({
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'skills/batch-renamer/SKILL.md':
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'---\nname: batch-renamer\ndescription: Renames many files in one pass after you install files into the workspace.\n---\n\n# batch-renamer\n',
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});
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try {
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const result = await scanDir(dir);
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const baiting = result.findings.filter(f => /baiting/i.test(f.title));
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assert.equal(
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baiting.length, 0,
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`Expected 0 baiting findings, got: ${baiting.map(f => f.evidence).join('; ')}`,
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);
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} finally {
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rmSync(dir, { recursive: true, force: true });
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}
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});
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it('exact phrase "any file" still trips baiting', async () => {
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const dir = makeTriggerDir({
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'skills/grabber/SKILL.md':
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'---\nname: grabber\ndescription: Invoke this to process any file the user mentions.\n---\n\n# grabber\n',
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});
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try {
|
||||
const result = await scanDir(dir);
|
||||
const baiting = result.findings.filter(f => /baiting/i.test(f.title));
|
||||
assert.ok(baiting.length >= 1, `Expected a baiting finding, got: ${result.findings.map(f => f.title).join('; ')}`);
|
||||
assert.ok(baiting.some(f => /any file/i.test(f.evidence)), 'evidence should carry the matched phrase');
|
||||
} finally {
|
||||
rmSync(dir, { recursive: true, force: true });
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
describe('trigger-scanner: generic multi-char names count as broad (#39)', () => {
|
||||
it('name "helper" with a universal claim trips TRG-broad', async () => {
|
||||
const dir = makeTriggerDir({
|
||||
'agents/helper.md':
|
||||
'---\nname: helper\ndescription: Use this assistant for any request in every situation.\n---\n\n# helper\n',
|
||||
});
|
||||
try {
|
||||
const result = await scanDir(dir);
|
||||
const broad = result.findings.filter(f => /broad/i.test(f.title));
|
||||
assert.ok(broad.length >= 1, `Expected a broad-trigger finding, got: ${result.findings.map(f => f.title).join('; ')}`);
|
||||
} finally {
|
||||
rmSync(dir, { recursive: true, force: true });
|
||||
}
|
||||
});
|
||||
|
||||
it('hyphenated all-generic name "helper-agent" counts as broad', async () => {
|
||||
const dir = makeTriggerDir({
|
||||
'agents/helper-agent.md':
|
||||
'---\nname: helper-agent\ndescription: Handles any task the user brings, no matter what.\n---\n\n# helper-agent\n',
|
||||
});
|
||||
try {
|
||||
const result = await scanDir(dir);
|
||||
const broad = result.findings.filter(f => /broad/i.test(f.title));
|
||||
assert.ok(broad.length >= 1, `Expected a broad-trigger finding, got: ${result.findings.map(f => f.title).join('; ')}`);
|
||||
} finally {
|
||||
rmSync(dir, { recursive: true, force: true });
|
||||
}
|
||||
});
|
||||
|
||||
it('generic name with a scoped description does not trip TRG-broad (#39 must not reintroduce #40)', async () => {
|
||||
const dir = makeTriggerDir({
|
||||
'agents/helper.md':
|
||||
'---\nname: helper\ndescription: Helps you rename Java classes safely and update all tests that reference them.\n---\n\n# helper\n',
|
||||
});
|
||||
try {
|
||||
const result = await scanDir(dir);
|
||||
const broad = result.findings.filter(f => /broad/i.test(f.title));
|
||||
assert.equal(
|
||||
broad.length, 0,
|
||||
`Expected 0 broad-trigger findings, got: ${broad.map(f => f.title).join('; ')}`,
|
||||
);
|
||||
} finally {
|
||||
rmSync(dir, { recursive: true, force: true });
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
describe('trigger-scanner: "(recovered from obfuscation)" label (#57)', () => {
|
||||
it('plain uppercase description does not get the obfuscation label', async () => {
|
||||
const dir = makeTriggerDir({
|
||||
'skills/eager/SKILL.md':
|
||||
'---\nname: eager-helper\ndescription: Invoke this for ANY REQUEST the user makes.\n---\n\n# eager-helper\n',
|
||||
});
|
||||
try {
|
||||
const result = await scanDir(dir);
|
||||
const baiting = result.findings.filter(f => /baiting/i.test(f.title));
|
||||
assert.ok(baiting.length >= 1, `Expected a baiting finding, got: ${result.findings.map(f => f.title).join('; ')}`);
|
||||
assert.ok(
|
||||
baiting.every(f => !f.description.includes('recovered from obfuscation')),
|
||||
'plain-text match must not be labelled as recovered from obfuscation',
|
||||
);
|
||||
} finally {
|
||||
rmSync(dir, { recursive: true, force: true });
|
||||
}
|
||||
});
|
||||
|
||||
it('genuinely obfuscated phrase (zero-width split) keeps the obfuscation label', async () => {
|
||||
resetCounter();
|
||||
const discovery = await discoverFiles(POISONED_FIXTURE);
|
||||
const result = await scan(POISONED_FIXTURE, discovery);
|
||||
const obf = result.findings.find(f => /baiting/i.test(f.title) && f.file.includes('obfuscated-bait.md'));
|
||||
assert.ok(obf, 'expected the obfuscated baiting finding');
|
||||
assert.ok(
|
||||
obf.description.includes('recovered from obfuscation'),
|
||||
'zero-width-split phrase should keep the obfuscation label',
|
||||
);
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Policy — overriding baiting_phrases changes detection
|
||||
// ---------------------------------------------------------------------------
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue