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How the CVE Works:
The vulnerability in `bep/imagemeta` arises during PNG and WebP image metadata parsing. The library allocates memory for metadata buffers based solely on values extracted from the image headers, without enforcing reasonable size limits. Attackers can craft malicious PNG or WebP files with abnormally large metadata chunks, causing excessive memory consumption. Since the allocation relies on unchecked user-supplied values, this leads to denial-of-service (DoS) conditions by exhausting system resources. The flaw was mitigated in v0.11.0 by capping metadata buffer allocations at 10 MB.
DailyCVE Form:
Platform: bep/imagemeta
Version: < v0.11.0
Vulnerability: Unbounded memory allocation
Severity: Medium
Date: Apr 9, 2025
What Undercode Say:
Exploitation:
1. Craft a PNG/WebP with oversized metadata:
with open("exploit.png", "wb") as f:
f.write(b"\x89PNG\r\n\x1a\n...") Insert inflated metadata chunk
2. Serve the file to trigger parsing:
curl -X POST --data-binary @exploit.png http://target/upload
Protection:
1. Upgrade to `bep/imagemeta` v0.11.0+:
go get github.com/bep/[email protected]
2. Validate image metadata size pre-processing:
func safeParse(img []byte) error {
if len(img) > 1010241024 {
return errors.New("metadata too large")
}
return imagemeta.Parse(img)
}
Detection:
1. Scan for vulnerable dependencies:
go list -m all | grep bep/imagemeta
2. Monitor memory spikes during image processing.
Mitigation:
- Implement rate-limiting on image uploads.
- Use sandboxed environments for parsing.
- Reject files with irregular metadata early.
References:
- Patch: GitHub Commit
- CVE: NVD Entry
References:
Reported By: https://github.com/advisories/GHSA-fmhh-rw3h-785m
Extra Source Hub:
Undercode
