medium4.0
CVE-2021-32842
Path Traversal in SharpZipLib
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | SharpZipLib | >= 1.0.0, < 1.3.3 | 1.3.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sharpziplib Project | Sharpziplib | from 1.0.0 before 1.3.3 |