CVE-2023-24626

Publication date 8 April 2023

Last updated 4 October 2024

Ubuntu priority

Cvss 3 Severity Score

socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
screen	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Fixed 4.6.2-1ubuntu1.1+esm1 Ubuntu Pro
	16.04 LTS xenial	Fixed 4.3.1-2ubuntu0.1+esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 4.1.0~20120320gitdb59704-9ubuntu0.1~esm3 Ubuntu Pro

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro

Notes

rodrigo-zaiden

debian does not use setuid or setgid for screen by default

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
screen	Upstream: ?id=e9a

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-6198-1
GNU Screen vulnerability
3 July 2023