CVE-2024-2698 — Freeipa: delegation rules allow a proxy service to impersonate any user to access another target service

Description (CNA)

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 (CNA)

Vendor / product	Versions
Not supplied / Not supplied	affected 4.11.0 before 4.11.2; affected 4.12.0 before 4.12.1
Red Hat / Red Hat Enterprise Linux 8	unaffected 8100020240528133707.823393f5 before *
Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 8080020240530051744.b0a6ceea before *
Red Hat / Red Hat Enterprise Linux 9	unaffected 0:4.11.0-15.el9_4 before *
Red Hat / Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:4.10.1-12.el9_2.2 before *
Red Hat / Red Hat Enterprise Linux 6	unknown
Red Hat / Red Hat Enterprise Linux 7	affected
Red Hat / Red Hat Enterprise Linux 8	unaffected

CWE

CWE-863

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.