A rsync security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

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Ubuntu Security Notice USN-5359-1
March 31, 2022

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

rsync could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- rsync: fast, versatile, remote (and local) file-copying tool

Details:

Danilo Ramos discovered that rsync incorrectly handled memory when
performing certain zlib deflating operations. An attacker could use this
issue to cause rsync 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 20.04 LTS:
rsync 3.1.3-8ubuntu0.3

Ubuntu 18.04 LTS:
rsync 3.1.2-2.1ubuntu1.4

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

References:
  https://ubuntu.com/security/notices/USN-5359-1
CVE-2018-25032

Package Information:
  https://launchpad.net/ubuntu/+source/rsync/3.1.3-8ubuntu0.3
  https://launchpad.net/ubuntu/+source/rsync/3.1.2-2.1ubuntu1.4