Bug 1102323 (CVE-2014-3468)

Summary:	CVE-2014-3468 libtasn1: asn1_get_bit_der() can return negative bit length
Product:	[Other] Security Response	Reporter:	Tomas Hoger <thoger>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jkurik, jrusnack, ktietz, lbopf, nmavrogi, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libtasn1 3.6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-06-10 12:45:19 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1102336, 1102337, 1102338, 1102339, 1102355, 1102356, 1103087, 1103088, 1103089
Bug Blocks:	1101736

Description Tomas Hoger 2014-05-28 18:31:12 UTC

It was discovered that libtasn1 library function asn1_get_bit_der() could incorrectly report negative bit length of the value read from ASN.1 input.  This could possibly lead to an out of bounds access in an application using libtasn1, for example in case if application tried to terminate read value with NUL byte.

The following upstream commit corrects the issue and causes the function to report error rather than return negative length value:
http://git.savannah.gnu.org/cgit/libtasn1.git/commit/?id=1c3ccb3e040bf13e342ee60bc23b21b97b11923f

Comment 3 Tomas Hoger 2014-05-29 11:41:39 UTC

Acknowledgment:

Red Hat would like to thank GnuTLS upstream for reporting this issue.

Comment 4 Tomas Hoger 2014-05-30 08:18:04 UTC

Fixed upstream in libtasn1 3.6:
http://lists.gnu.org/archive/html/help-libtasn1/2014-05/msg00006.html

Comment 5 Tomas Hoger 2014-05-30 08:26:28 UTC

Created libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1103087]

Comment 6 Tomas Hoger 2014-05-30 08:26:31 UTC

Created mingw-libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1103088]

Comment 7 Tomas Hoger 2014-05-30 08:26:34 UTC

Created mingw32-gnutls tracking bugs for this issue:

Affects: epel-5 [bug 1103089]

Comment 8 errata-xmlrpc 2014-06-03 16:09:41 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0596 https://rhn.redhat.com/errata/RHSA-2014-0596.html

Comment 9 errata-xmlrpc 2014-06-03 16:10:41 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:0594 https://rhn.redhat.com/errata/RHSA-2014-0594.html

Comment 10 Fedora Update System 2014-06-04 07:52:08 UTC

libtasn1-3.6-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Fedora Update System 2014-06-10 03:06:14 UTC

libtasn1-3.6-1.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 errata-xmlrpc 2014-06-10 12:35:40 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0687 https://rhn.redhat.com/errata/RHSA-2014-0687.html

Comment 13 errata-xmlrpc 2014-06-30 17:28:55 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2014:0815 https://rhn.redhat.com/errata/RHSA-2014-0815.html