Bug 771775 (CVE-2011-4576)

Summary:	CVE-2011-4576 openssl: uninitialized SSL 3.0 padding
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, ktietz, lfarkas, 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:	2012-09-25 07:55:54 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:	773239, 773240, 773241, 773243, 773246, 773330, 773331, 846586
Bug Blocks:	771783

Description Vincent Danen 2012-01-04 22:38:53 UTC

Uninitialized SSL 3.0 Padding (CVE-2011-4576)
=============================================

OpenSSL prior to 1.0.0f and 0.9.8s failed to clear the bytes used as
block cipher padding in SSL 3.0 records. This affects both clients and
servers that accept SSL 3.0 handshakes: those that call SSL_CTX_new with
SSLv3_{server|client}_method or SSLv23_{server|client}_method. It does
not affect TLS.

As a result, in each record, up to 15 bytes of uninitialized memory
may be sent, encrypted, to the SSL peer. This could include sensitive
contents of previously freed memory.

However, in practice, most deployments do not use
SSL_MODE_RELEASE_BUFFERS and therefore have a single write buffer per
connection. That write buffer is partially filled with non-sensitive,
handshake data at the beginning of the connection and, thereafter,
only records which are longer any any previously sent record leak any
non-encrypted data. This, combined with the small number of bytes
leaked per record, serves to limit to severity of this issue.

Thanks to Adam Langley <agl> for identifying and fixing
this issue.

Affected users should upgrade to OpenSSL 1.0.0f or 0.9.8s.

Reference: http://openssl.org/news/secadv_20120104.txt

Comment 1 Vincent Danen 2012-01-04 23:12:29 UTC

Seems to be the fix here:

http://cvs.openssl.org/chngview?cn=21940

Comment 2 Fedora Update System 2012-01-11 06:13:12 UTC

openssl-1.0.0f-1.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Tomas Hoger 2012-01-11 14:52:04 UTC

Created mingw32-openssl tracking bugs for this issue

Affects: fedora-all [bug 773330]
Affects: epel-5 [bug 773331]

Comment 5 Fedora Update System 2012-01-15 20:09:50 UTC

openssl-1.0.0f-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 errata-xmlrpc 2012-01-24 21:05:13 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:0060 https://rhn.redhat.com/errata/RHSA-2012-0060.html

Comment 7 errata-xmlrpc 2012-01-24 21:05:24 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0059 https://rhn.redhat.com/errata/RHSA-2012-0059.html

Comment 8 errata-xmlrpc 2012-02-01 18:56:59 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2012:0086 https://rhn.redhat.com/errata/RHSA-2012-0086.html

Comment 9 errata-xmlrpc 2012-02-15 16:09:43 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2012:0109 https://rhn.redhat.com/errata/RHSA-2012-0109.html

Comment 10 errata-xmlrpc 2012-02-21 05:05:48 UTC

This issue has been addressed in following products:

  RHEV-H, V2V and Agents for RHEL-5

Via RHSA-2012:0168 https://rhn.redhat.com/errata/RHSA-2012-0168.html

Comment 11 errata-xmlrpc 2012-09-24 16:02:37 UTC

This issue has been addressed in following products:

  JBoss Enterprise Application Platform 6.0.0

Via RHSA-2012:1308 https://rhn.redhat.com/errata/RHSA-2012-1308.html

Comment 12 errata-xmlrpc 2012-09-24 16:03:38 UTC

This issue has been addressed in following products:

  JBoss Enterprise Application Platform 5.1.2

Via RHSA-2012:1307 https://rhn.redhat.com/errata/RHSA-2012-1307.html

Comment 13 errata-xmlrpc 2012-09-24 16:04:47 UTC

This issue has been addressed in following products:

  JBoss Enterprise Web Server 1.0.2

Via RHSA-2012:1306 https://rhn.redhat.com/errata/RHSA-2012-1306.html