Bug 1026942 (CVE-2013-1418)

Summary:	CVE-2013-1418 krb5: multi-realm KDC null dereference leads to crash
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	colin, ddas, dpal, jkurik, jplans, jrusnack, nalin, nathaniel, rmainz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	krb5 1.10.7	Doc Type:	Bug Fix
Doc Text:	It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-10-14 09:19:55 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:	1026981, 1026997, 1089845, 1121510
Bug Blocks:	1026945, 1063682, 1101912

Description Vincent Danen 2013-11-05 17:11:13 UTC

It was reported [1] that if a KDC serves multiple realms, certain requests could cause the setup_server_realm() funtion to dereference a null pointer, resulting in a crash of the KDC (Key Distribution Center).  This can be triggered by an unauthenticated user.

This has been correct in git [2].

[1] http://mailman.mit.edu/pipermail/krb5-bugs/2013-November/010206.html
[2] https://github.com/krb5/krb5/commit/5d2d9a1abe46a2c1a8614d4672d08d9d30a5f8bf

Comment 2 Vincent Danen 2013-11-05 19:20:00 UTC

Upstream ticket:

http://krbdev.mit.edu/rt/Ticket/Display.html?id=7757

Comment 3 Vincent Danen 2013-11-05 20:41:01 UTC

Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1026997]

Comment 4 Fedora Update System 2013-11-12 00:28:10 UTC

krb5-1.11.3-29.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2013-12-03 10:37:19 UTC

krb5-1.11.3-13.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Huzaifa S. Sidhpurwala 2013-12-30 09:07:14 UTC

Note: This issue can be triggered only if multiple realms are served from one KDC

Statement:

(none)

Comment 12 Martin Prpič 2014-09-09 09:47:11 UTC

IssueDescription:

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request.

Comment 13 errata-xmlrpc 2014-09-16 05:29:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:1245 https://rhn.redhat.com/errata/RHSA-2014-1245.html

Comment 14 errata-xmlrpc 2014-10-14 08:10:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:1389 https://rhn.redhat.com/errata/RHSA-2014-1389.html