Severity: high

Arbitrary File Overwrite



Versions of fstream prior to 1.0.12 are vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hardlink to a file that already exists in the system and a file that matches the hardlink will overwrite the system's file with the contents of the extracted file. The fstream.DirWriter() function is vulnerable.


Upgrade to version 1.0.12 or later.


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Advisory timeline

  1. published

    Advisory Published
    May 15th, 2019
  2. reported

    Reported by Max Justicz
    May 15th, 2019