PT-2026-120304 · Npm · @Apostrophecms/Form
تاريخ النشر
2026-10-20
·
تاريخ التحديث
2026-10-20
CVSS v3.1
5.3
متوسطة
| المتجه | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Summary
The form submission endpoint runs
multer({ dest: os.tmpdir() }).any() before authentication, API-key, CSRF-equivalent, or form-existence logic, with no size/count/rate limits. Unauthenticated users can stream unbounded bodies to disk per request; cleanup occurs only after the full body is received.Details
packages/form/index.js apiRoutes.post.submit (L274–296): [ multer({ dest: os.tmpdir() }).any(), self.normalizeFiles, async function (req) { try { submitForm } finally { unlink files } } ]. No limits, no rate limiting, no pre-validation. "CSRF" is a fixed-value double-submit cookie (vulnlab.csrf=csrf, set on any GET, express/index.js L694–703) — trivially obtainable anonymously.PoC
$ curl -s -c csrfjar.cookies http://localhost:3100/ # get vulnlab.csrf=csrf (any GET)
$ df -P /tmp # before: used=1105212
$ curl -b csrfjar.cookies -X POST http://localhost:3100/api/v1/@apostrophecms/form/submit
-F "file=@/tmp/opencode/big.bin;type=application/octet-stream" &
DURING transfer: used=1148668
still transferring: used=1226936 # +121MB mid-transfer on disk
http=500 time=1.78s sent=209715411B # generic error AFTER full staging
# Anonymous, zero credentials. 200MB written to /tmp pre-validation.Impact
Any unauthenticated client can force the server to persist entire request bodies to the temp filesystem and CPU-decode them; parallel requests exhaust disk
/tmp (process/host crash) and saturate the event loop — a trivial remote DoS. Aborted transfers risk orphaning staged files (no req.aborted cleanup).Remediation — Set multer
limits (fileSize, fields, parts, fieldSize); perform auth/role/existence checks before the multer mount or inside the checked handler; unlink staged files on first read and on req.aborted/error; add per-IP rate limiting.إصلاح
Allocation of Resources Without Limits
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المنتجات المتأثرة
@Apostrophecms/Form