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AUSCERT External Security Bulletin Redistribution
ESB-2023.3788
USN-6198-1: GNU Screen vulnerability
4 July 2023
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AusCERT Security Bulletin Summary
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Product: GNU Screen
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2023-24626
Original Bulletin:
https://ubuntu.com/security/notices/USN-6198-1
Comment: CVSS (Max): 6.5 CVE-2023-24626 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
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USN-6198-1: GNU Screen vulnerability
3 July 2023
GNU Screen could be made to crash applications if it received specially crafted
input.
Releases
o Ubuntu 18.04 ESM
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o 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.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o screen – 4.6.2-1ubuntu1.1+esm1
Available with Ubuntu Pro
Ubuntu 16.04
o screen – 4.3.1-2ubuntu0.1+esm1
Available with Ubuntu Pro
Ubuntu 14.04
o screen – 4.1.0~20120320gitdb59704-9ubuntu0.1~esm3
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References
o CVE-2023-24626
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