USN-4747-1: GNU Screen vulnerability

24 February 2021

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



  • 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
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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


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