| Name | CVE-2021-32841 |
| Description | SharpZipLib (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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| mono (PTS) | jessie, jessie (lts) | 3.2.8+dfsg-10+deb8u1 | fixed |
| stretch (lts), stretch | 4.6.2.7+dfsg-1+deb9u1 | fixed | |
| buster (security), buster, buster (lts) | 5.18.0.240+dfsg-3+deb10u1 | fixed | |
| bullseye | 6.8.0.105+dfsg-3.3~deb11u1 | fixed | |
| bookworm | 6.8.0.105+dfsg-3.3 | fixed | |
| sid, trixie | 6.12.0.199+dfsg-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| mono | source | (unstable) | (not affected) |
- 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