CVE-2021-28676

NameCVE-2021-28676
DescriptionAn issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.
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)
NVD severitymedium
Debian Bugs989062

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pillow (PTS)stretch4.0.0-4+deb9u1vulnerable
stretch (security)4.0.0-4+deb9u2vulnerable
buster5.4.1-2+deb10u2vulnerable
buster (security)5.4.1-2+deb10u1vulnerable
bullseye8.1.2+dfsg-0.1vulnerable
sid8.1.2+dfsg-0.2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pillowsourceexperimental8.2.0-1
pillowsource(unstable)8.1.2+dfsg-0.2989062

Notes

[buster] - pillow <no-dsa> (Minor issue)
[stretch] - pillow <no-dsa> (Minor issue)
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos
https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856

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