HIGH severity fixes:
- H1: Bot token leak via 302 redirect — always proxy S3 GETs
- H2: PUT TOCTOU race — add unique partial index (bucket_id, s3_key) WHERE NOT deleted
- H3: GET/HEAD ignore conditional headers (If-Match, If-None-Match, etc.)
- H4: Body payload hash not verified — add verifyBodyHash() post-stream check
- H5: Header-based auth has no expiry check — add 15-min clock skew window
- H7: Multipart abort does not delete parts — DELETE before UPDATE status
- H8: CompleteMultipartUpload skips part number & etag verification
- H9: XML regex fails on keys containing < — use non-greedy [\s\S]*?
- H10: Path-style vs virtual-hosted key decode mismatch
MEDIUM severity fixes:
- M1: Add Date header fallback for x-amz-date
- M2/M3: Validate service/termination in credential scope
- M4: Temp file leak when forwardToStorage throws in handleUploadPart
- M5: Multipart key consistency check (s3Key matches URL)
- M7: Use stored content-type from multipart initiate
- M9: Copy conditional headers skip when fileHash is null
- M11: Add 1000-key limit on DeleteObjects
- M13: Stricter bucket name validation (no .., no IP format)
- M14: NaN partNumber bypasses validation
LOW fixes:
- normalizeUri: dot-segment removal per RFC 3986
- localeCompare -> byte-order comparison in canonical query string
- Validate host in signed headers
- Server: AmazonS3 header on all responses
- x-amz-id-2 separate from x-amz-request-id
- IPv6 handling in stripPort
- Quiet element whitespace tolerance in XML parser
- content-type: application/xml on empty 2xx responses
- Duplicate interfaces/s3/ -> re-exports from utils/s3/
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude