Bug 2232682 (CVE-2023-39975) - CVE-2023-39975 krb5: double-free in KDC TGS processing
Summary: CVE-2023-39975 krb5: double-free in KDC TGS processing
Keywords:
Status: NEW
Alias: CVE-2023-39975
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2232684 2232685
Blocks: 2232683
TreeView+ depends on / blocked
 
Reported: 2023-08-17 21:17 UTC by Zack Miele
Modified: 2025-10-10 12:53 UTC (History)
4 users (show)

Fixed In Version: krb5-1.21.2
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2023:6699 0 None None None 2023-11-07 08:22:40 UTC

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.
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