NULL pointer dereference in Kerberos 5 - CVE-2015-8630

Vulnerability identifier: #VU32306

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-8630

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 in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.4 and 1.14.x before 1.14.1 allow remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) by specifying KADM5_POLICY with a NULL policy name. <a href="http://cwe.mitre.org/data/definitions/476. A remote attacker can perform a denial of service (DoS) attack.

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

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

krb5 (Alpine package) - update to 1.12.4-r1
krb5 (Red Hat package) - update to 1.13.2-12.el7_2
krb5 - addressed in versions 1.13.2-13.fc22, 1.14-7.fc23

• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8342
• http://lists.opensuse.org/opensuse-updates/2016-02/msg00059.html
• http://lists.opensuse.org/opensuse-updates/2016-02/msg00110.html
• http://rhn.redhat.com/errata/RHSA-2016-0532.html
• http://www.debian.org/security/2016/dsa-3466
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
• http://www.securitytracker.com/id/1034915
• https://github.com/krb5/krb5/commit/b863de7fbf080b15e347a736fdda0a82d42f4f6b

• 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 22 update for krb5
• Red Hat Enterprise Linux 7 update for krb5