1. Ubuntu Security Notices
  2. USN-4747-1

USN-4747-1: GNU Screen vulnerability

Publication date

24 February 2021

Overview

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

Releases

Packages

  • screen - terminal multiplexer with VT100/ANSI terminal emulation

Details

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.

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

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

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
20.10 groovy screen –  4.8.0-2ubuntu0.1
20.04 focal screen –  4.8.0-1ubuntu0.1
18.04 bionic screen –  4.6.2-1ubuntu1.1
16.04 xenial screen –  4.3.1-2ubuntu0.1

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References

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