Vulnerability Details CVE-2021-32842
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.7%
CVSS Severity
CVSS v3 Score 4.0
CVSS v2 Score 5.0
References
Products affected by CVE-2021-32842
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.0.0
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.1.0
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.2.0
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.3.0
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.3.1
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cpe:2.3:a:sharpziplib_project:sharpziplib:1.3.2