NULL pointer dereference in Kerberos 5 - CVE-2016-3120

Vulnerability identifier: #VU32240

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2016-3120

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via an S4U2Self request.

Kerberos 5
Amazon Linux AMI
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server for ARM
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - Extended Update Support
Fedora
krb5 (Alpine package)
krb5
krb5 (Red Hat package)

Update to version 1.13.6.

Kerberos 5 - update to 1.13.6
krb5 (Alpine package) - update to 1.13.6-r0
krb5 - addressed in versions 1.14.1-8.fc23, 1.14.1-8.fc24, 1.14.1-9.fc23, 1.14.3-4.fc23, 1.14.3-8.fc23
krb5 (Red Hat package) - update to 1.14.1-26.el7

• 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/

• NULL pointer dereference in web.mit.edu krb5
• NULL pointer dereference in krb5 (Alpine package)
• Amazon Linux AMI update for krb5
• Fedora 23 update for krb5
• Fedora 24 update for krb5
• Fedora 23 update for krb5
• Fedora 23 update for krb5
• Fedora 23 update for krb5
• Red Hat Enterprise Linux 7 update for krb5