CVE-2024-2698

Summary

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.

Affected Software

VendorProductVersion RangeStatus
4.11.0 < 4.11.2affected
4.12.0 < 4.12.1affected
Red HatRed Hat Enterprise Linux 88100020240528133707.823393f5 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support8080020240530051744.b0a6ceea < *unaffected
Red HatRed Hat Enterprise Linux 90:4.11.0-15.el9_4 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support0:4.10.1-12.el9_2.2 < *unaffected

Weaknesses

  • CWE-863: Incorrect Authorization

Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References