Description
SharpZipLib (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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| icsharpcode | sharpziplib | 1.3.3 – < 1.3.3, 1.0.0 – < 1.0.0* | 1.3.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mono | No fix yet | — |
| Ubuntu 26.04 LTS | mono | No fix yet | — |
| Ubuntu 25.10 | mono | No fix yet | — |
| Ubuntu 24.04 LTS | mono | No fix yet | — |
| Ubuntu 22.04 LTS | mono | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mono | No fix yet | — |
| Ubuntu 18.04 LTS | mono | No fix yet | — |
| Ubuntu 16.04 LTS | mono | No fix yet | — |
| Ubuntu 14.04 LTS | mono | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| NuGet | SharpZipLib | >= 1.0.0, < 1.3.3 | 1.3.3 | GHSA-mm6g-mmq6-53ff |