Bug 668719 (CVE-2011-0281)

Summary:	CVE-2011-0281 krb5: KDC hang when using LDAP backend caused by special principal name (MITKRB5-SA-2011-002)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	nalin, security-response-team, vdanen, wnefal+redhatbugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-06-21 09:31:14 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:	671096, 671097, 671101, 671102, 676127
Bug Blocks:

Description Jan Lieskovsky 2011-01-11 11:39:17 UTC

A denial of service flaw was found in the way 
MIT Key Distribution Center (KDC) daemon processed
certain principal names provided in request for 
ticket-granting ticket, when the krb5kdc daemon was 
configured to use an LDAP back end. A remote attacker 
could use this flaw to cause a krb5kdc daemon hang
via a ticket-granting ticket request for specially-crafted
principal name.

Acknowledgements: 

Red Hat would like to thank the MIT Kerberos project for reporting
this issue. Upstream acknowledges Kevin Longfellow of Oracle Corporation
as the original reporter.

Comment 5 Jan Lieskovsky 2011-01-20 09:14:18 UTC

This issue does NOT affect the versions of the krb5 package,
as shipped with Red Hat Enterprise Linux 3 or 4, as those
versions do not support LDAP back end yet.

--

This issue affects the versions of the krb5 package, as shipped
with Red Hat Enterprise Linux 5 and 6.

--

This issue affects the versions of the krb5 package, as shipped
with Fedora release of 13 and 14.

Comment 8 Vincent Danen 2011-02-08 21:19:48 UTC

This issue is now public:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt

Statement:

This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 3 or 4 as they did not include support for the LDAP backend.

Comment 9 Vincent Danen 2011-02-08 21:38:31 UTC

Created krb5 tracking bugs for this issue

Affects: fedora-all [bug 676127]

Comment 10 errata-xmlrpc 2011-02-08 21:41:40 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0199 https://rhn.redhat.com/errata/RHSA-2011-0199.html

Comment 11 errata-xmlrpc 2011-02-08 21:52:02 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0200 https://rhn.redhat.com/errata/RHSA-2011-0200.html