Freeipa: delegation rules allow a proxy service to impersonate any user to access another target service

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-2698
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-06-12 08:15:50 UTC
Updated2026-11-07 14:17:01 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-863 | CWE-863 Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Freeipa Freeipa All All All All
Application Freeipa Freeipa 4.12.0 All All All
Operating System Redhat Enterprise Linux 6.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Operating System Redhat Enterprise Linux Eus 8.8 All All All
Operating System Redhat Enterprise Linux Eus 9.2 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 8100020240528133707.823393f5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support unaffected 8080020240530051744.b0a6ceea * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:4.11.0-15.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support unaffected 0:4.10.1-12.el9_2.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified

References

ReferenceSourceLinkTags
lists.fedoraproject.org/archives/list/[email protected]/messag... af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
access.redhat.com/security/cve/CVE-2024-2698 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2024:3759 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2024:3757 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2024:3755 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2024:3754 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
bugzilla.redhat.com/show_bug.cgi af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Mitigation, Vendor Advisory
www.freeipa.org/release-notes/4-12-1.html af854a3a-2127-422b-91ae-364da2661108 www.freeipa.org Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2024-03-19T00:00:00.000ZReported to Red Hat.
CNA2024-06-10T00:00:00.000ZMade public.

Workarounds

CNA: 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.

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