[USN-4747-1] GNU Screen vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Wed Feb 24 14:53:31 UTC 2021

Ubuntu Security Notice USN-4747-1
February 24, 2021

screen vulnerability

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


GNU Screen could be made to crash or run programs if it processed specially
crafted character sequences.

Software Description:
- screen: terminal multiplexer with VT100/ANSI terminal emulation


Felix Weinmann discovered that GNU Screen incorrectly handled certain
character sequences. A remote attacker could use this issue to cause GNU
Screen 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:
  screen                          4.8.0-2ubuntu0.1

Ubuntu 20.04 LTS:
  screen                          4.8.0-1ubuntu0.1

Ubuntu 18.04 LTS:
  screen                          4.6.2-1ubuntu1.1

Ubuntu 16.04 LTS:
  screen                          4.3.1-2ubuntu0.1

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


Package Information:

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