CVE-2016-3120: Null Pointer Dereference
First published: Mon Aug 01 2016(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Kerberos | =1.13 | |
| Kerberos | =1.13.1 | |
| Kerberos | =1.13.2 | |
| Kerberos | =1.13.3 | |
| Kerberos | =1.13.4 | |
| Kerberos | =1.13.5 | |
| Kerberos | =1.13.6 | |
| Kerberos | =1.14 | |
| Kerberos | =1.14.1 | |
| Kerberos | =1.14.2 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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@lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
Frequently Asked Questions
What is the severity of CVE-2016-3120?
CVE-2016-3120 has a medium severity rating as it allows denial of service attacks against the Key Distribution Center.
How do I fix CVE-2016-3120?
To fix CVE-2016-3120, upgrade to MIT Kerberos version 1.13.6 or later, or 1.14.3 or later.
Which versions of MIT Kerberos are affected by CVE-2016-3120?
MIT Kerberos versions 1.13.0 to 1.13.5 and 1.14.0 to 1.14.2 are affected by CVE-2016-3120.
What is the impact of CVE-2016-3120?
CVE-2016-3120 can lead to a denial of service by allowing remote authenticated users to cause service disruptions.
Is CVE-2016-3120 exploitable in all configurations of MIT Kerberos?
CVE-2016-3120 is exploitable only when the restrict_anonymous_to_tgt option is enabled in the configuration.
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/last-modified-date
- agent/author
- agent/references
- agent/description
- agent/first-publish-date
- agent/event
- agent/weakness
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/mit
- canonical/kerberos
- version/kerberos/1.13
- version/kerberos/1.13.1
- version/kerberos/1.13.2
- version/kerberos/1.13.3
- version/kerberos/1.13.4
- version/kerberos/1.13.5
- version/kerberos/1.13.6
- version/kerberos/1.14
- version/kerberos/1.14.1
- version/kerberos/1.14.2