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USN-5378-4: Gzip vulnerability

13 April 2022

Gzip could be made to overwrite arbitrary files.



  • gzip - GNU compression utilities


USN-5378-1 fixed a vulnerability in Gzip. This update provides
the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

Cleemy Desu Wayo discovered that Gzip incorrectly handled certain
filenames. If a user or automated system were tricked into performing zgrep
operations with specially crafted filenames, a remote attacker could
overwrite arbitrary files.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04
Ubuntu 14.04

In general, a standard system update will make all the necessary changes.


Related notices

  • USN-5378-1: gzip-win32, gzip
  • USN-5378-2: xz-utils, liblzma-dev, xzdec, liblzma-doc, liblzma5
  • USN-5378-3: xz-utils, liblzma-dev, xzdec, liblzma-doc, liblzma5