A xterm security update has been relased for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

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Ubuntu Security Notice USN-4746-1
February 24, 2021

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

xterm could be made to crash or run programs if it handled specially
crafted character sequences.

Software Description:
- xterm: X terminal emulator

Details:

Tavis Ormandy discovered that xterm incorrectly handled certain character
sequences. A remote attacker could use this issue to cause xterm 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 20.10:
xterm 353-1ubuntu1.20.10.2

Ubuntu 20.04 LTS:
xterm 353-1ubuntu1.20.04.2

Ubuntu 18.04 LTS:
xterm 330-1ubuntu2.2

Ubuntu 16.04 LTS:
xterm 322-1ubuntu1.2

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

References:
  https://usn.ubuntu.com/4746-1
CVE-2021-27135

Package Information:
  https://launchpad.net/ubuntu/+source/xterm/353-1ubuntu1.20.10.2
  https://launchpad.net/ubuntu/+source/xterm/353-1ubuntu1.20.04.2
  https://launchpad.net/ubuntu/+source/xterm/330-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/xterm/322-1ubuntu1.2