Bug 949984 (CVE-2013-1416)

Summary:	CVE-2013-1416 krb5: NULL pointer dereference (DoS, KDC crash) by processing certain TGS requests
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dpal, jclere, jdoyle, jplans, lgao, nalin, nathaniel, weli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	krb5-1.10.5, krb5-1.9.5	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-04-16 19:17:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	949987, 950342, 950343
Bug Blocks:	949998

Description Jan Lieskovsky 2013-04-09 12:27:16 UTC

A NULL pointer deference flaw was found in the way key distribution center (KDC) of MIT Kerberos 5, a network authentication system, performed processing of certain ticket-granting service requests (TGS-REQs). A remote authenticated attacker could use this flaw to cause the KDC process to crash (attempting to dereference a NULL pointer).

Upstream ticket:
[1] http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=7600

Relevant upstream patch:
[2] https://github.com/krb5/krb5/commit/8ee70ec63931d1e38567905387ab9b1d45734d81

Other references:
[3] http://diswww.mit.edu:8008/menelaus.mit.edu/cvs-krb5/27664
[4] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=704775

Comment 1 Jan Lieskovsky 2013-04-09 12:33:23 UTC

This issue affects the versions of the krb5 package, as shipped with Fedora release of 17 and 18. Please schedule an update.

Comment 2 Jan Lieskovsky 2013-04-09 12:34:44 UTC

Created krb5 tracking bugs for this issue

Affects: fedora-all [bug 949987]

Comment 3 Jan Lieskovsky 2013-04-09 12:48:05 UTC

This issue did NOT affect the versions of the krb5 package, as shipped with Red Hat Enterprise Linux 4 and 5.

--

This issue affects the version of the krb5 package, as shipped with Red Hat Enterprise Linux 6.

Comment 7 Vincent Danen 2013-04-16 17:17:15 UTC

Statement:

This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 4 and 5.

Comment 8 errata-xmlrpc 2013-04-16 18:23:46 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0748 https://rhn.redhat.com/errata/RHSA-2013-0748.html

Comment 9 Fedora Update System 2013-04-18 02:43:23 UTC

krb5-1.10.3-15.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 Fedora Update System 2013-04-18 02:54:43 UTC

krb5-1.10.2-10.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Jan Lieskovsky 2013-04-20 08:56:11 UTC

Kerberos 5 release 1.10.5 announcement:
  http://web.mit.edu/kerberos/krb5-1.10/krb5-1.10.5.html#announcement

Kerberos 5 release 1.9.5 announcement:
  http://web.mit.edu/kerberos/krb5-1.9/krb5-1.9.5.html#announcement