CVE-2024-2698

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.

Reserved 2024-03-19 | Published 2024-06-12 | Updated 2024-11-25 | Assigner redhat

Problem types

Incorrect Authorization

Product status

Default status
unaffected

4.11.0 before 4.11.2
affected

4.12.0 before 4.12.1
affected

Default status
affected

8100020240528133707.823393f5 before *
unaffected

Default status
affected

8080020240530051744.b0a6ceea before *
unaffected

Default status
affected

0:4.11.0-15.el9_4 before *
unaffected

Default status
affected

0:4.10.1-12.el9_2.2 before *
unaffected

Default status
unknown

Default status
affected

Default status
unaffected

Timeline

2024-03-19:	Reported to Red Hat.
2024-06-10:	Made public.

References

access.redhat.com/errata/RHSA-2024:3754 (RHSA-2024:3754) vendor-advisory

access.redhat.com/errata/RHSA-2024:3755 (RHSA-2024:3755) vendor-advisory

access.redhat.com/errata/RHSA-2024:3757 (RHSA-2024:3757) vendor-advisory

access.redhat.com/errata/RHSA-2024:3759 (RHSA-2024:3759) vendor-advisory

access.redhat.com/security/cve/CVE-2024-2698 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2270353 (RHBZ#2270353) issue-tracking

www.freeipa.org/release-notes/4-12-1.html

cve.org (CVE-2024-2698)

nvd.nist.gov (CVE-2024-2698)

Download JSON