CVE-2021-32840: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

February 1, 2022

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. A TAR file entry ../evil.txt may be extracted in the parent directory of destFolder. This leads to arbitrary file write that may lead to code execution.

References

github.com/advisories/GHSA-m22m-h4rf-pwq3
github.com/icsharpcode/SharpZipLib/commit/a0e96de70b5264f4c919b09253b1522bc7a221cc
github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
nvd.nist.gov/vuln/detail/CVE-2021-32840
securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/

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