Ubuntu Security Notice 4747-2 - USN-4747-1 fixed a vulnerability in screen. This update provides the corresponding update for Ubuntu 14.04 ESM. 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. Various other issues were also addressed.
1b3fb06c80115b5fd908c46bc9df0c0b72cf0a01e3ab16f2514b31da9f648478
=========================================================================
Ubuntu Security Notice USN-4747-2
February 24, 2021
screen vulnerability
=========================================================================
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