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Ubuntu Security Notice USN-4747-2
February 24, 2021

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

- Ubuntu 14.04 ESM

Summary:

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

Details:

USN-4747-1 fixed a vulnerability in screen. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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.

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~esm2

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

References:
  https://usn.ubuntu.com/4747-2
  https://usn.ubuntu.com/4747-1
  CVE-2021-26937