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Ubuntu Security Notice USN-5570-2

Ubuntu Security Notice 5570-2 - USN-5570-1 fixed a vulnerability in zlib. This update provides the corresponding update for Ubuntu 22.04 LTS and Ubuntu 20.04 LTS. 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.

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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

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