USN-3996-1: GNU Screen vulnerability

29 May 2019

GNU Screen vulnerability

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


GNU Screen could be made to crash or run programs as your login if it opened a specially crafted file or received specially crafted input.

Software Description

  • screen - terminal multiplexer with VT100/ANSI terminal emulation


Kuang-che Wu discovered that GNU Screen improperly handled certain input. An attacker could use this issue to cause GNU Screen to crash, resulting in a denial of service or the execution of arbitrary code.

Update instructions

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

Ubuntu 14.04 ESM
screen - 4.1.0~20120320gitdb59704-9ubuntu0.1~esm1
Ubuntu 12.04 ESM
screen - 4.0.3-14ubuntu8.1

To update your system, please follow these instructions:

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