Pre-installation verification of VS Code extensions via URL — fetch a remote
VSIX, extract it in a hardened sandbox, and run the existing IDE scanner
pipeline against it. No npm dependencies.
Sources:
- VS Code Marketplace (publisher.gallery.vsassets.io direct download)
- OpenVSX (open-vsx.org official API)
- Direct .vsix HTTPS URLs
Defenses:
- HTTPS-only, TLS verified, manual redirect with per-source host whitelist
- 30s total timeout via AbortController
- 50MB compressed cap, 500MB uncompressed, 100x expansion ratio
- Zero-dep ZIP extractor: zip-slip, absolute paths, drive letters, NUL bytes,
symlinks (Unix mode 0xA000), depth limits, ZIP64 rejected, encrypted rejected
- SHA-256 streamed during fetch, surfaced in meta.source
- Temp dir cleanup in all paths (try/finally)
Files:
- scanners/lib/vsix-fetch.mjs (HTTPS fetcher, host whitelist, streaming SHA-256)
- scanners/lib/zip-extract.mjs (zero-dep parser with hardening caps)
- knowledge/marketplace-api-notes.md (endpoint reference)
- 3 test files (48 tests added: vsix-fetch, zip-extract, ide-extension-url)
Tests: 1296 → 1344 (all green).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Harden git clone attack surface for remote scans with defense-in-depth:
Layer 1 (all platforms): 8 git config flags disable hooks, symlinks,
filter/smudge drivers, fsmonitor, local file protocol. 4 env vars
isolate from system/user git config and block interactive prompts.
Layer 2 (OS sandbox): macOS sandbox-exec and Linux bubblewrap (bwrap)
restrict file writes to only the specific temp directory. bwrap
probe-tests availability before use. Graceful fallback on Windows
and Ubuntu 24.04+ (git config hardening only).
Additional: post-clone 100MB size check, UUID-unique evidence filenames,
evidence file cleanup, cleanup guarantee in scan/plugin-audit commands.
32 new tests (1147 total).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
