NULL Pointer Dereference Affecting krb5-libs package, versions <0:1.14.1-26.el7
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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- published26 Jul 2021
- disclosed19 Jul 2016
Introduced: 19 Jul 2016
CVE-2016-3120 (opens in a new tab)How to fix?
Upgrade RHEL:7 krb5-libs to version 0:1.14.1-26.el7 or higher.
This issue was patched in RHSA-2016:2591.
NVD Description
Note: Versions mentioned in the description apply only to the upstream krb5-libs package and not the krb5-libs package as distributed by RHEL.
See How to fix? for RHEL:7 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
- http://www.securityfocus.com/bid/92132
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458
- https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
- http://web.mit.edu/kerberos/krb5-1.13/
- http://web.mit.edu/kerberos/krb5-1.14/
- https://access.redhat.com/security/cve/CVE-2016-3120
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
- https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
- http://rhn.redhat.com/errata/RHSA-2016-2591.html
- https://access.redhat.com/errata/RHSA-2016:2591
- http://www.securitytracker.com/id/1036442
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/