CVE-2021-39208
Versions prior to 0.29.0 are vulnerable to partial path traversal.
Does this matter?
Lower severity and a low EPSS score (1.19%). Track it; it rarely justifies an emergency change on its own.
Description
SharpCompress 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.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 1.19% probability · 66th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- sharpcompress project/sharpcompress
- Source
- security-advisories@github.com
References
- https://github.com/adamhathcock/sharpcompress/pull/614Patch, Third Party Advisory
- https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0Release Notes, Third Party Advisory
- https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjfExploit, Third Party Advisory
- https://github.com/adamhathcock/sharpcompress/pull/614Patch, Third Party Advisory
- https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0Release Notes, Third Party Advisory
- https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcv-6mjfExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.