CVE-2024-2698
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.67% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- freeipa/freeipa
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2024:3754Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3755Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3757Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3759Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2024-2698Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2270353Issue Tracking, Mitigation, Vendor Advisory
- https://www.freeipa.org/release-notes/4-12-1.htmlRelease Notes
- https://access.redhat.com/errata/RHSA-2024:3754Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3755Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3757Vendor Advisory
- https://access.redhat.com/errata/RHSA-2024:3759Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2024-2698Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2270353Issue Tracking, Mitigation, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WT3JL7JQDIAFKKEFARWYES7GZNWGQNCI/
- https://www.freeipa.org/release-notes/4-12-1.htmlRelease Notes
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.