Bug 676063 (CVE-2011-0014)

Summary:	CVE-2011-0014 openssl: OCSP stapling vulnerability
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:	erik-fedora, kalevlember, lfarkas, mvadkert, rjones, tmraz, wnefal+redhatbugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-19 13:34:53 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:
Bug Depends On:	676069, 676070, 676341, 1127896
Bug Blocks:

Description Vincent Danen 2011-02-08 18:25:00 UTC

A flaw [1] was found in OpenSSL 0.9.8h through 0.9.8q and 1.0.0 through 1.0.0c where an incorrectly formatted ClientHello handshake message could cause OpenSSL to parse past the end of the message.  An attacker could use this flaw to trigger an invalid memory access, causing a crash of an application linked to OpenSSL.  As well, certain applications may expose the contents of parsed OCSP extensions, specifically the OCSP nonce extension.

Applications are only affected if they act as a server and call SSL_CTX_set_tlsext_status_cb on the server's SSL_CTX.  One such application is Apache httpd >= 2.3.3.

This issue was addressed in OpenSSL versions 0.9.8r and 1.0.0d.  A patch is included in the upstream advisory [1].

[1] http://www.openssl.org/news/secadv_20110208.txt

Comment 1 Vincent Danen 2011-02-08 18:31:48 UTC

Created mingw32-openssl tracking bugs for this issue

Affects: fedora-all [bug 676070]

Comment 2 Vincent Danen 2011-02-08 18:31:51 UTC

Created openssl tracking bugs for this issue

Affects: fedora-all [bug 676069]

Comment 4 Tomas Hoger 2011-02-11 14:56:25 UTC

The flaw exists in the code for parsing TLS status_request extension.  Support for that extension was introduced in version 0.9.8h via this upstream commit:
  http://cvs.openssl.org/chngview?cn=16672

Therefore, this issue does not affect openssl packages in Red Hat Enterprise Linux 3, 4 and 5.  Only openssl packages in Red Hat Enterprise Linux 6 are affected.

Upstream advisory also mentions that this issue only affects server applications that call SSL_CTX_set_tlsext_status_cb to set status_request extension callback function.  The only application shipped with Red Hat Enterprise Linux 6 using this function is openssl's testing s_server application.

Comment 8 Tomas Hoger 2011-02-21 18:38:16 UTC

As noted above, this OpenSSL feature is not used by any application shipped with Red Hat Enterprise Linux 6.  Given the limited impact and the lack of affected applications, we plan to address this as part of openssl update in Red Hat Enterprise Linux 6.1.

Statement:

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, and 5. It was addressed in Red Hat Enterprise Linux 6 via RHSA-2011:0677.

Comment 9 errata-xmlrpc 2011-05-19 11:47:33 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0677 https://rhn.redhat.com/errata/RHSA-2011-0677.html