NULL Pointer Dereference Affecting krb5 package, versions <1.14.3+dfsg-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-KRB5-5683894
- published1 Aug 2016
- disclosed1 Aug 2016
Introduced: 1 Aug 2016
CVE-2016-3120 (opens in a new tab)How to fix?
Upgrade Debian:13 krb5 to version 1.14.3+dfsg-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream krb5 package and not the krb5 package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2016-3120
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458
- http://web.mit.edu/kerberos/krb5-1.13/
- http://web.mit.edu/kerberos/krb5-1.14/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3120
- 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://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
- http://rhn.redhat.com/errata/RHSA-2016-2591.html
- http://www.securityfocus.com/bid/92132
- http://www.securitytracker.com/id/1036442
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-3120
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/