Bug 2401960 (CVE-2025-61984)

Summary:	CVE-2025-61984 openssh: OpenSSH: Control characters in usernames can lead to code execution via ProxyCommand
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adudiak, kshier, sadas, stcannon, teagle, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in OpenSSH where control characters in usernames were not properly validated when sourced from untrusted inputs like the command line or configuration expansion. If a ProxyCommand is used, these control characters could modify command behavior, potentially leading to code execution.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2402666, 2402667
Bug Blocks:

Description OSIDB Bzimport 2025-10-06 19:01:37 UTC

ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)

Comment 2 errata-xmlrpc 2025-12-17 14:05:49 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:23479 https://access.redhat.com/errata/RHSA-2025:23479

Comment 3 errata-xmlrpc 2025-12-17 16:33:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:23480 https://access.redhat.com/errata/RHSA-2025:23480

Comment 4 errata-xmlrpc 2025-12-17 17:28:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:23481 https://access.redhat.com/errata/RHSA-2025:23481

Comment 5 errata-xmlrpc 2026-01-15 11:39:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:0693 https://access.redhat.com/errata/RHSA-2026:0693

Comment 6 errata-xmlrpc 2026-01-22 09:03:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:0976 https://access.redhat.com/errata/RHSA-2026:0976