=========================================================================Ubuntu Security Notice USN-5570-2
October 17, 2022

zlib vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

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

Software Description:
- zlib: Lossless data-compression library

Details:

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 LTS:
   lib32z1                         1:1.2.11.dfsg-2ubuntu9.2
   lib64z1                         1:1.2.11.dfsg-2ubuntu9.2
   libx32z1                        1:1.2.11.dfsg-2ubuntu9.2
   zlib1g                          1:1.2.11.dfsg-2ubuntu9.2

Ubuntu 20.04 LTS:
   lib32z1                         1:1.2.11.dfsg-2ubuntu1.5
   lib64z1                         1:1.2.11.dfsg-2ubuntu1.5
   libx32z1                        1:1.2.11.dfsg-2ubuntu1.5
   zlib1g                          1:1.2.11.dfsg-2ubuntu1.5

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

References:
   https://ubuntu.com/security/notices/USN-5570-2
   https://ubuntu.com/security/notices/USN-5570-1
   CVE-2022-37434

Package Information:
   https://launchpad.net/ubuntu/+source/zlib/1:1.2.11.dfsg-2ubuntu9.2
   https://launchpad.net/ubuntu/+source/zlib/1:1.2.11.dfsg-2ubuntu1.5