CVE-2024-2698: Freeipa: delegation rules allow a proxy service to impersonate any user to access another target service
First published: Tue Mar 19 2024(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/FreeIPA | <4.11.2 | 4.11.2 |
| redhat/FreeIPA | <4.12.1 | 4.12.1 |
| All of | ||
| Any of | ||
| Red Hat FreeIPA | >=4.11.0<4.11.2 | |
| Red Hat FreeIPA | =4.12.0 | |
| Any of | ||
| Red Hat Enterprise Linux | =6.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| Red Hat Enterprise Linux Server EUS | =8.8 | |
| Red Hat Enterprise Linux Server EUS | =9.2 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2024:3754
- https://access.redhat.com/errata/RHSA-2024:3755
- https://access.redhat.com/errata/RHSA-2024:3757
- https://access.redhat.com/errata/RHSA-2024:3759
- https://access.redhat.com/security/cve/CVE-2024-2698
- https://bugzilla.redhat.com/show_bug.cgi?id=2270353
- https://www.freeipa.org/release-notes/4-12-1.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2291165
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WT3JL7JQDIAFKKEFARWYES7GZNWGQNCI/
Frequently Asked Questions
What is the severity of CVE-2024-2698?
CVE-2024-2698 has been classified as a moderate severity vulnerability.
How do I fix CVE-2024-2698?
To fix CVE-2024-2698, upgrade FreeIPA to version 4.11.2 or 4.12.1 as specified in the vulnerability report.
What software is affected by CVE-2024-2698?
CVE-2024-2698 affects FreeIPA versions prior to 4.11.2 and 4.12.1.
Can I continue using FreeIPA with CVE-2024-2698?
It is not recommended to continue using FreeIPA with CVE-2024-2698 as it poses potential security risks.
What is the impact of CVE-2024-2698 on FreeIPA?
The impact of CVE-2024-2698 includes potential unauthorized delegation of the forwardable flag on S4U2Self tickets in the FreeIPA environment.
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