CVE-2021-32842

NameCVE-2021-32842
DescriptionSharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that `_baseDirectory` ends with slash. If the _baseDirectory is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins as the destination directory one level up from the 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 fixed 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)buster5.18.0.240+dfsg-3fixed
buster (security)5.18.0.240+dfsg-3+deb10u1fixed
bullseye6.8.0.105+dfsg-3.3~deb11u1fixed
bookworm6.8.0.105+dfsg-3.3fixed
sid, trixie6.8.0.105+dfsg-3.6fixed

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

Search for package or bug name: Reporting problems