[USN-5355-1] zlib vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Wed Mar 30 16:06:54 UTC 2022

Ubuntu Security Notice USN-5355-1
March 30, 2022

zlib vulnerability

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


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

Software Description:
- zlib: Lossless data-compression library


Danilo Ramos discovered that zlib incorrectly handled memory when
performing certain deflating 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 21.10:
  lib32z1                         1:1.2.11.dfsg-2ubuntu7.1
  lib64z1                         1:1.2.11.dfsg-2ubuntu7.1
  libx32z1                        1:1.2.11.dfsg-2ubuntu7.1
  zlib1g                          1:1.2.11.dfsg-2ubuntu7.1

Ubuntu 20.04 LTS:
  lib32z1                         1:1.2.11.dfsg-2ubuntu1.3
  lib64z1                         1:1.2.11.dfsg-2ubuntu1.3
  libx32z1                        1:1.2.11.dfsg-2ubuntu1.3
  zlib1g                          1:1.2.11.dfsg-2ubuntu1.3

Ubuntu 18.04 LTS:
  lib32z1                         1:1.2.11.dfsg-0ubuntu2.1
  lib64z1                         1:1.2.11.dfsg-0ubuntu2.1
  libx32z1                        1:1.2.11.dfsg-0ubuntu2.1
  zlib1g                          1:1.2.11.dfsg-0ubuntu2.1

After a standard system update you need to reboot your computer to make
all the necessary changes.


Package Information:
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