Bug 491034 (CVE-2009-0847)

Summary:	CVE-2009-0847 krb5: incorrect length check inside ASN.1 decoder (MITKRB5-SA-2009-001)
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:	nalin, rcvalle
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-0847
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-04-08 17:58:53 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:

Description Vincent Danen 2009-03-19 02:17:48 UTC

MIT krb5 can perform an incorrect length check inside an ASN.1
decoder.  This only presents a problem in the PK-INIT code paths.  In
the MIT krb5 KDC or kinit program, this could lead to spurious
malloc() failures or, under some conditions, program crash.  We have
heard reports of the spurious malloc() failures, but nobody has yet
made the publicly made the connection to a security issue.

Comment 2 Vincent Danen 2009-03-19 02:21:24 UTC

This issue only affects krb5 1.6.3+.  Prior releases contained the vulnerable code, but the vulnerability is masked due to operations perfomed by other code. so this does not affect Red Hat Enterprise Linux 2.1, 3, 4, or 5.

Comment 6 Tomas Hoger 2009-04-07 18:20:59 UTC

Public now via:
  http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt

Comment 7 Fedora Update System 2009-04-07 23:23:15 UTC

krb5-1.6.3-16.fc9 has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2009-04-07 23:23:35 UTC

krb5-1.6.3-18.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Tomas Hoger 2009-04-09 09:30:20 UTC

Even though this problem was not exposed in the krb5 versions shipped in Red Hat Enterprise Linux 2.1, 3, 4, and 5 and hence did not create a security flaw on those versions, upstream patch addressing underlying problem being part of the MITKRB5-SA-2009-001 patch was included in the updates addressing other ASN.1 decoding issue - CVE-2009-0846 and was released in following errata:
  https://rhn.redhat.com/errata/CVE-2009-0846.html

Comment 10 Red Hat Product Security 2009-04-09 09:35:48 UTC

This issue was addressed in:

Fedora:
  https://admin.fedoraproject.org/updates/F10/FEDORA-2009-2852
  https://admin.fedoraproject.org/updates/F9/FEDORA-2009-2834