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osvGoogleOSV:GHSA-JP7F-GRCV-6MJF
HistorySep 20, 2021 - 7:53 p.m.

Partial path traversal in sharpcompress

2021-09-2019:53:42
Google
osv.dev
4
sharpcompress
path traversal
hierarchy recreation
destination directory
extraction
destinationfilename
fulldestinationdirectorypath
file creation
arbitrary file
security impact
software restriction.

EPSS

0.001

Percentile

34.5%

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:

public static void WriteEntryToDirectory(IEntry entry,
                                         string destinationDirectory,
                                         ExtractionOptions? options,
                                         Action<string, ExtractionOptions?> write)
{
    string destinationFileName;
    string file = Path.GetFileName(entry.Key);
    string fullDestinationDirectoryPath = Path.GetFullPath(destinationDirectory);
...
        throw new ExtractionException("Entry is trying to write a file outside of the destination directory.");
}

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.

Impact

Because of the file name and destination directory constraints the arbitrary file creation impact is limited and depends on the use case.

EPSS

0.001

Percentile

34.5%

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