A vulnerability was found in FreeIPA in how the initial implementation of MS-SFU by MIT Kerberos was missing a condition for granting the "forwardable" flag on S4U2Self tickets. Fixing this mistake required adding a special case for the check_allowed_to_delegate() function: If the target service argument is NULL, then it means the KDC is probing for general constrained delegation rules and not checking a specific S4U2Proxy request.
In FreeIPA 4.11.0, the behavior of ipadb_match_acl() was modified to match the changes from upstream MIT Kerberos 1.20. However, a mistake resulting in this mechanism applies in cases where the target service argument is set AND where it is unset. This results in S4U2Proxy requests being accepted regardless of whether or not there is a matching service delegation rule.
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Tue, 17 Sep 2024 20:30:00 +0000
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MITRE
Status: PUBLISHED
Assigner: redhat
Published: 2024-06-12T08:03:49.013Z
Updated: 2024-09-17T14:33:38.882Z
Reserved: 2024-03-19T21:12:01.436Z
Link: CVE-2024-2698
Vulnrichment
Updated: 2024-08-01T19:18:48.347Z
NVD
Status : Awaiting Analysis
Published: 2024-06-12T08:15:50.250
Modified: 2024-09-16T20:15:45.940
Link: CVE-2024-2698
Redhat