CVE-2021-32840

Summary

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Prior to version 1.3.3, 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. The vulnerability was patched in version 1.3.3.

Affected Software

Weaknesses

• CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CVE Program Container

Additional References

• https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
• https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
• https://github.com/icsharpcode/SharpZipLib/commit/a0e96de70b5264f4c919b09253b1522bc7a221cc

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
• https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
• https://github.com/icsharpcode/SharpZipLib/commit/a0e96de70b5264f4c919b09253b1522bc7a221cc

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