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.