CVE-2020-12284 — cbs_jpeg_split_fragment in libavcodec/cbs_jpeg

cbs_jpeg_split_fragment in libavcodec/cbs_jpeg.c in FFmpeg 4.1 and 4.2.2 has a heap-based buffer overflow during JPEG_MARKER_SOS handling because of a missing length check.

01What is this vulnerability?

cbs_jpeg_split_fragment in libavcodec/cbs_jpeg.c in FFmpeg 4.1 and 4.2.2 has a heap-based buffer overflow during JPEG_MARKER_SOS handling because of a missing length check.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-04-28T05:16:43.000Z
• Last modified: 2024-08-04T11:48:58.777Z

09References

• github.com — https://github.com/FFmpeg/FFmpeg/commit/1812352d767ccf5431aa440123e2e260a4db2726
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19734
• www.debian.org — https://www.debian.org/security/2020/dsa-4722
• usn.ubuntu.com — https://usn.ubuntu.com/4431-1/
• security.gentoo.org — https://security.gentoo.org/glsa/202007-58
• github.com — https://github.com/FFmpeg/FFmpeg/commit/a3a3730b5456ca00587455004d40c047f7b20a99