Bug 752308 (CVE-2011-4128)

Summary:	CVE-2011-4128 gnutls: buffer overflow in gnutls_session_get_data() (GNUTLS-SA-2011-2)
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	jorton, omoris, scorneli, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gnutls 2.12.14, gnutls 3.0.7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-03-14 07:49:45 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:	752703, 805074, 805075, 805078, 805079, 805438, 805439, 841165, 1063396
Bug Blocks:	752310

Description Vincent Danen 2011-11-09 06:27:41 UTC

A flaw was reported [1] in the GnuTLS gnutls_session_get_data() function, which could overflow a too-short buffer parameter allocated by the caller.  The test which was to avoid such buffer overflows was not working.  A malicious server could use this flaw in a vulnerable client to send a larger SessionTicket in the hope of overflowing the client.

Upstream has indicated that they are unaware of any client software that does not properly use the session resumption functions; clients that perform session resumption as documented [2] are not vulnerable.

[1] http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/5596
[2] http://www.gnu.org/s/gnutls/manual/html_node/Client-with-Resume-capability-example.html#Client-with-Resume-capability-example

Comment 1 Vincent Danen 2011-11-09 06:32:11 UTC

Upstream git commits to correct the flaw:

http://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commitdiff;h=190cef6eed37d0e73a73c1e205eb31d45ab60a3c
http://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commitdiff;h=e82ef4545e9e98cbcb032f55d7c750b81e3a0450

This is corrected in upstream 2.12.14 and 3.0.7.

Comment 2 Vincent Danen 2011-11-09 17:07:10 UTC

This has been assigned the name CVE-2011-4128.

Comment 7 Huzaifa S. Sidhpurwala 2011-11-10 07:21:33 UTC

This issue affects the version of gnutls as shipped with Fedora 14, 15 and 16.

Comment 9 Huzaifa S. Sidhpurwala 2011-11-10 07:28:20 UTC

Created gnutls tracking bugs for this issue

Affects: fedora-all [bug 752703]

Comment 14 errata-xmlrpc 2012-03-27 22:56:54 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0429 https://rhn.redhat.com/errata/RHSA-2012-0429.html

Comment 15 errata-xmlrpc 2012-03-27 22:57:04 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:0428 https://rhn.redhat.com/errata/RHSA-2012-0428.html

Comment 16 Vincent Danen 2012-03-27 23:55:09 UTC

Statement:

This issue does not affect the version of gnutls as shipped with Red Hat Enterprise Linux 4.

Comment 17 Fedora Update System 2012-04-11 03:49:38 UTC

gnutls-2.10.5-3.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 18 Fedora Update System 2012-04-11 17:00:25 UTC

gnutls-2.10.5-3.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.