CVE-2021-39208

Path Traversal in nuget/sharpcompress

Identifier

CVE-2021-39208

Package Slug

nuget/sharpcompress

Vulnerability

Path Traversal

Description

SharpCompress is a fully managed C# library to deal with many compression types and formats. SharpCompress has been found to be 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, 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

Affected Versions

All versions before 0.29.0

Solution

Upgrade to version 0.29.0 or above.

Last Modified

2021-09-30

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