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Ubuntu 18.04: 6198-1 Critical: GNU Screen Application Crash

ubuntu
Calendar Grey July 3, 2023
Dist Ubuntu Esm H88
Ubuntu 7102-2 resolves a significant vulnerability in GNU Screen that may lead to program failures. Upgrade promptly to ensure your system's safety.
GNU Screen could be made to crash applications if it received specially crafted input.

Summary

GNU Screen could be made to crash applications if it received specially

crafted input.

Software Description:

- screen: terminal multiplexer with VT100/ANSI terminal emulation

Details:

It was discovered that GNU Screen was not properly checking user

identifiers before sending certain signals to target processes. If GNU

Screen was installed as setuid or setgid, a local attacker could possibly

use this issue to cause a denial of service on a target application.

Topics%20covered

Topics Covered

security advisory denial of service critical issue application crash ubuntu gnu screen

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   screen                          4.6.2-1ubuntu1.1+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   screen                          4.3.1-2ubuntu0.1+esm1

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   screen 4.1.0~20120320gitdb59704-9ubuntu0.1~esm3

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

References

  https://ubuntu.com/security/notices/USN-6198-1

  CVE-2023-24626

Severity
critical
Lowest
Low
Medium
High
Critical

July 03, 2023

Topics%20covered

Topics Covered

security advisory denial of service critical issue application crash ubuntu gnu screen

Package Information

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