CVE-2021-32841

NameCVE-2021-32841
DescriptionSharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.3.0 and prior to version 1.3.3, a check was added if the destination file is under destination directory. However, it is not enforced that `destDir` ends with slash. If the `destDir` is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins with the destination directory, i.e. `/home/user/dir.sh`. Because of the file name and destination directory constraints, the arbitrary file creation impact is limited and depends on the use case. Version 1.3.3 contains a patch for this vulnerability.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mono (PTS)bullseye6.8.0.105+dfsg-3.3~deb11u1fixed
bookworm6.8.0.105+dfsg-3.3fixed
sid, trixie6.12.0.199+dfsg-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
monosource(unstable)(not affected)

Notes

- mono <not-affected> (Vulnerable code not yet uploaded)
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78 (v1.3.3)
Introduced by https://github.com/icsharpcode/SharpZipLib/commit/0cbdef20f1d5654ab5b93a6ce1ff8a917d3b905b

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