Bug 576011 (CVE-2010-0629)

Summary:	CVE-2010-0629 krb5: kadmind use-after-free remote crash (MITKRB5-SA-2010-003)
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	batkisso, jlieskov, lsmid, mjc, nalin, rryder, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2010-003.txt
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-04-09 06:16:45 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:	578185, 578186
Bug Blocks:

Description Vincent Danen 2010-03-23 01:21:18 UTC

Brian Atkisson reported that the kadmind server on a master KDC was crashing due to certain requests from kadmin clients from krb5 1.8.  This is due to check_handle() in server_stubs.c returning a failure if the clients tries to start with API version 3.  The server frees the handle, and then attempts to dereference the handle when calling krb5_get_error_message(), at which point kadmind will usually segfault and crash.

This has already been fixed upstream in changeset 20485:

http://src.mit.edu/fisheye/changelog/krb5/?cs=20485

Comment 2 Vincent Danen 2010-03-23 02:08:28 UTC

This was previously reported to Debian:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567052

and upstream:

http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=5998

By the looks of the upstream reports, this is just a denial of service, nothing more.  It was also assigned CVE-2010-0629.

Comment 10 Vincent Danen 2010-03-23 19:50:48 UTC

Looking at the commit, this would have been fixed in 1.6.4, which means Fedora 11 is vulnerable.

This issue also does not affect Red Hat Enterprise Linux 4 or earlier as the variable in question (handle) isn't referenced after it is freed.

This issue does affect Red Hat Enterprise Linux 5.

Comment 13 Jan Lieskovsky 2010-04-06 21:01:56 UTC

Public via:
  [1] http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2010-003.txt

Comment 14 errata-xmlrpc 2010-04-06 23:07:58 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0343 https://rhn.redhat.com/errata/RHSA-2010-0343.html

Comment 15 Fedora Update System 2010-04-07 06:47:45 UTC

krb5-1.6.3-29.fc11 has been submitted as an update for Fedora 11.
http://admin.fedoraproject.org/updates/krb5-1.6.3-29.fc11

Comment 16 Fedora Update System 2010-04-09 01:42:00 UTC

krb5-1.6.3-29.fc11 has been pushed to the Fedora 11 stable repository.  If problems still persist, please make note of it in this bug report.