Bug 2232682 (CVE-2023-39975)

Summary:	CVE-2023-39975 krb5: double-free in KDC TGS processing
Product:	[Other] Security Response	Reporter:	Zack Miele <zmiele>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	abokovoy, jplans, jrische, nalin
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	krb5-1.21.2	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in MIT krb5, where an authenticated attacker can cause a KDC to free the same pointer twice if it can induce a failure in authorization data handling.	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:	2232684, 2232685
Bug Blocks:	2232683

Description Zack Miele 2023-08-17 21:17:43 UTC

kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.

https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
https://web.mit.edu/kerberos/www/advisories/
https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final

Comment 2 errata-xmlrpc 2023-11-07 08:22:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:6699 https://access.redhat.com/errata/RHSA-2023:6699

Comment 3 Julien Rische 2025-10-10 12:53:13 UTC

I think this ticket should be closed. RHEL8 was not affected and the fix was released on RHEL9. The fix was also released on Fedora.