A zlib security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

USN-5570-2: zlib vulnerability

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

zlib vulnerability
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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