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==========================================================================
Ubuntu Security Notice USN-5355-2
March 30, 2022

zlib vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- zlib: compression library - 32 bit runtime

Details:

USN-5355-1 fixed a vulnerability in zlib. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 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 16.04 ESM:
  lib32z1                         1:1.2.8.dfsg-2ubuntu4.3+esm1
  lib64z1                         1:1.2.8.dfsg-2ubuntu4.3+esm1
  libx32z1                        1:1.2.8.dfsg-2ubuntu4.3+esm1
  zlib1g                          1:1.2.8.dfsg-2ubuntu4.3+esm1

Ubuntu 14.04 ESM:
  lib32z1                         1:1.2.8.dfsg-1ubuntu1.1+esm1
  lib64z1                         1:1.2.8.dfsg-1ubuntu1.1+esm1
  libx32z1                        1:1.2.8.dfsg-1ubuntu1.1+esm1
  zlib1g                          1:1.2.8.dfsg-1ubuntu1.1+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5355-2
  https://ubuntu.com/security/notices/USN-5355-1
  CVE-2018-25032

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