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Ubuntu Security Notice USN-3996-1
May 29, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

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

Details:

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

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

References:
  https://usn.ubuntu.com/usn/usn-3996-1
  CVE-2015-6806