CVE-2021-21848

NameCVE-2021-21848
DescriptionAn exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4966-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gpac (PTS)stretch0.5.2-426-gc5ad4e4+dfsg5-3+deb9u1fixed
buster0.5.2-426-gc5ad4e4+dfsg5-5fixed
bullseye (security), bullseye1.0.1+dfsg1-4+deb11u1fixed
bookworm, sid1.0.1+dfsg1-5fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gpacsourcestretch(not affected)
gpacsourcebuster(not affected)
gpacsourcebullseye1.0.1+dfsg1-4+deb11u1DSA-4966-1
gpacsource(unstable)1.0.1+dfsg1-5

Notes

[buster] - gpac <not-affected> (Vulnerable code not present)
[stretch] - gpac <not-affected> (Vulnerable code not present)
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297
https://github.com/gpac/gpac/commit/b515fd04f5f00f4a99df741042f1efb31ad56351
https://github.com/gpac/gpac/issues/1814

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