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5e7244ab8b
Three defense-in-depth gaps from GHSA-3wgj-c2hg-vm6q that the v0.9.5 serving-side fix didn't address: 1. _process_picture_url (utils/oauth.py): MIME was inferred from the URL extension via mimetypes.guess_type, the upstream Content-Type was discarded, and there was no allowlist. An SVG picture URL produced data:image/svg+xml;base64,... in the user's profile_image_url. Switch to the upstream Content-Type and gate it against PROFILE_IMAGE_ALLOWED_MIME_TYPES (the same env var the serving endpoint already uses); fall back to /user.png if the MIME isn't in the allowlist. Also pass allow_redirects=AIOHTTP_CLIENT_ ALLOW_REDIRECTS on the aiohttp session.get — the existing validate_url() only checks the initial URL, redirects to internal targets would otherwise still be followed (same class as the rh5x-h6pp-cjj6 cluster, sixth call site). 2. update_user_profile_image_url_by_id (models/users.py): SQLAlchemy write path bypassed the Pydantic form validators, so anything stored via OAuth or any other non-form caller landed in the column unchallenged. Run validate_profile_image_url at the storage layer before the assignment. 3. insert_new_user (models/users.py): same gap on the new-user path used by Auths.insert_new_auth (OAuth signup, LDAP). Same storage-layer call to validate_profile_image_url, falling back to /user.png if the supplied value doesn't pass. The serving-endpoint allowlist landed in v0.9.5 already broke the exploit chain matte1782 demonstrated (browser never receives Content-Type: image/svg+xml), but bad data was still being written to the DB and the upstream MIME was never trusted. These three fixes harden the ingestion + storage layers so future serving paths or DB readers don't have to assume the column is clean. Reported by matte1782 in GHSA-3wgj-c2hg-vm6q. Co-authored-by: matte1782 <matte1782@users.noreply.github.com> |
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