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USN-5570-2: zlib vulnerability

17 October 2022

zlib could be made to crash or run programs if it received specially crafted input.



  • zlib - Lossless data-compression library


USN-5570-1 fixed a vulnerability in zlib. This update provides the
corresponding update for Ubuntu 22.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

Evgeny Legerov discovered that zlib incorrectly handled memory when
performing certain inflate operations. An attacker could use this issue
to cause zlib to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions

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

Ubuntu 22.04
Ubuntu 20.04

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


Related notices

  • USN-5570-1: lib64z1-dev, lib64z1, lib32z1, lib32z1-dev, zlib1g, zlib, libx32z1-dev, zlib1g-dev, zlib-bin, libx32z1
  • USN-5573-1: rsync