CVE-2021-39208

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Summary

CVECVE-2021-39208
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-09-16 15:15:00 UTC
Updated2021-09-28 12:40:00 UTC
DescriptionSharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However, prior to version 0.29.0, it is not enforced that fullDestinationDirectoryPath ends with slash. If the destinationDirectory 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. This issue is fixed in SharpCompress version 0.29.0.

Risk And Classification

Problem Types: CWE-22

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Sharpcompress Project Sharpcompress All All All All

References

ReferenceSourceLinkTags
Ensure destination directory exists. by adamhathcock · Pull Request #614 · adamhathcock/sharpcompress · GitHub MISC github.com
WriteEntryToDirectory used for an archive extraction is vulnerable to partial path traversal. · Advisory · adamhathcock/sharpcompress · GitHub CONFIRM github.com
Release 0.29.0 - minor behavior change and fixes · adamhathcock/sharpcompress · GitHub MISC github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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