CVE-2016-3120
Description
The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.14.3+dfsg-1 |
| sid | Fixed | 1.14.3+dfsg-1 |
| forky | Fixed | 1.14.3+dfsg-1 |
| bullseye | Fixed | 1.14.3+dfsg-1 |
| bookworm | Fixed | 1.14.3+dfsg-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| mit | kerberos_5 | 1.13 | |
| mit | kerberos_5 | 1.13.1 | |
| mit | kerberos_5 | 1.13.2 | |
| mit | kerberos_5 | 1.13.3 | |
| mit | kerberos_5 | 1.13.4 | |
| mit | kerberos_5 | 1.13.5 | |
| mit | kerberos_5 | 1.13.6 | |
| mit | kerberos_5 | 1.14 | |
| mit | kerberos_5 | 1.14.1 | |
| mit | kerberos_5 | 1.14.2 | |
References
- https://www.suse.com/security/cve/CVE-2016-3120.html
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
- http://rhn.redhat.com/errata/RHSA-2016-2591.html
- http://web.mit.edu/kerberos/krb5-1.13/
- http://web.mit.edu/kerberos/krb5-1.14/
- http://www.securityfocus.com/bid/92132
- http://www.securitytracker.com/id/1036442
- https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
- https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
- https://security-tracker.debian.org/tracker/CVE-2016-3120
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.