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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Red Hat Issues Fix) OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
SecurityTracker Alert ID:  1026857
SecurityTracker URL:  http://securitytracker.com/id/1026857
CVE Reference:   CVE-2012-0884   (Links to External Site)
Date:  Mar 28 2012
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 0.9.8u, 1.0.0h
Description:   A vulnerability was reported in OpenSSL. A remote user can decrypt messages in certain cases.

A remote user can exploit a flaw in the CMS and PKCS#7 code by conducting an RSA padding attack (similar to the Bleichenbacher PKCS#1 attack and also known as the million message attack (MMA)) to potentially decrypt a message.

The vendor reports that an average of 2^20 messages must be sent by the remote user to the target decryption system to achieve a successful attack.

SSL/TLS applications do not use the CMS, PKCS#7, or S/MIME decryption code and are not affected.

Ivan Nestlerode reported this vulnerability.

Impact:   A remote user can decrypt a message in certain cases.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-0426.html

Vendor URL:  www.openssl.org/news/secadv_20120312.txt (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 12 2012 OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages



 Source Message Contents

Date:  Tue, 27 Mar 2012 23:05:05 +0000
Subject:  [RHSA-2012:0426-01] Moderate: openssl security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: openssl security and bug fix update
Advisory ID:       RHSA-2012:0426-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0426.html
Issue date:        2012-03-27
CVE Names:         CVE-2012-0884 CVE-2012-1165 
=====================================================================

1. Summary:

Updated openssl packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.

A NULL pointer dereference flaw was found in the way OpenSSL parsed
Secure/Multipurpose Internet Mail Extensions (S/MIME) messages. An attacker
could use this flaw to crash an application that uses OpenSSL to decrypt or
verify S/MIME messages. (CVE-2012-1165)

A flaw was found in the PKCS#7 and Cryptographic Message Syntax (CMS)
implementations in OpenSSL. An attacker could possibly use this flaw to
perform a Bleichenbacher attack to decrypt an encrypted CMS, PKCS#7, or
S/MIME message by sending a large number of chosen ciphertext messages to
a service using OpenSSL and measuring error response times. (CVE-2012-0884)

This update also fixes a regression caused by the fix for CVE-2011-4619,
released via RHSA-2012:0060 and RHSA-2012:0059, which caused Server Gated
Cryptography (SGC) handshakes to fail.

All OpenSSL users should upgrade to these updated packages, which contain
backported patches to resolve these issues. For the update to take effect,
all services linked to the OpenSSL library must be restarted, or the system
rebooted.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

802489 - CVE-2012-1165 openssl: mime_param_cmp NULL dereference crash
802725 - CVE-2012-0884 openssl: CMS and PKCS#7 Bleichenbacher attack

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/openssl-0.9.8e-22.el5_8.1.src.rpm

i386:
openssl-0.9.8e-22.el5_8.1.i386.rpm
openssl-0.9.8e-22.el5_8.1.i686.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i386.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i686.rpm
openssl-perl-0.9.8e-22.el5_8.1.i386.rpm

x86_64:
openssl-0.9.8e-22.el5_8.1.i686.rpm
openssl-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i686.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-perl-0.9.8e-22.el5_8.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/openssl-0.9.8e-22.el5_8.1.src.rpm

i386:
openssl-debuginfo-0.9.8e-22.el5_8.1.i386.rpm
openssl-devel-0.9.8e-22.el5_8.1.i386.rpm

x86_64:
openssl-debuginfo-0.9.8e-22.el5_8.1.i386.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-devel-0.9.8e-22.el5_8.1.i386.rpm
openssl-devel-0.9.8e-22.el5_8.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/openssl-0.9.8e-22.el5_8.1.src.rpm

i386:
openssl-0.9.8e-22.el5_8.1.i386.rpm
openssl-0.9.8e-22.el5_8.1.i686.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i386.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i686.rpm
openssl-devel-0.9.8e-22.el5_8.1.i386.rpm
openssl-perl-0.9.8e-22.el5_8.1.i386.rpm

ia64:
openssl-0.9.8e-22.el5_8.1.i686.rpm
openssl-0.9.8e-22.el5_8.1.ia64.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i686.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.ia64.rpm
openssl-devel-0.9.8e-22.el5_8.1.ia64.rpm
openssl-perl-0.9.8e-22.el5_8.1.ia64.rpm

ppc:
openssl-0.9.8e-22.el5_8.1.ppc.rpm
openssl-0.9.8e-22.el5_8.1.ppc64.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.ppc.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.ppc64.rpm
openssl-devel-0.9.8e-22.el5_8.1.ppc.rpm
openssl-devel-0.9.8e-22.el5_8.1.ppc64.rpm
openssl-perl-0.9.8e-22.el5_8.1.ppc.rpm

s390x:
openssl-0.9.8e-22.el5_8.1.s390.rpm
openssl-0.9.8e-22.el5_8.1.s390x.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.s390.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.s390x.rpm
openssl-devel-0.9.8e-22.el5_8.1.s390.rpm
openssl-devel-0.9.8e-22.el5_8.1.s390x.rpm
openssl-perl-0.9.8e-22.el5_8.1.s390x.rpm

x86_64:
openssl-0.9.8e-22.el5_8.1.i686.rpm
openssl-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i386.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.i686.rpm
openssl-debuginfo-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-devel-0.9.8e-22.el5_8.1.i386.rpm
openssl-devel-0.9.8e-22.el5_8.1.x86_64.rpm
openssl-perl-0.9.8e-22.el5_8.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm

x86_64:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm
openssl-perl-1.0.0-20.el6_2.3.i686.rpm
openssl-static-1.0.0-20.el6_2.3.i686.rpm

x86_64:
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.x86_64.rpm
openssl-perl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-static-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

x86_64:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

x86_64:
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.x86_64.rpm
openssl-perl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-static-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm

ppc64:
openssl-1.0.0-20.el6_2.3.ppc.rpm
openssl-1.0.0-20.el6_2.3.ppc64.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.ppc.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.ppc64.rpm
openssl-devel-1.0.0-20.el6_2.3.ppc.rpm
openssl-devel-1.0.0-20.el6_2.3.ppc64.rpm

s390x:
openssl-1.0.0-20.el6_2.3.s390.rpm
openssl-1.0.0-20.el6_2.3.s390x.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.s390.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.s390x.rpm
openssl-devel-1.0.0-20.el6_2.3.s390.rpm
openssl-devel-1.0.0-20.el6_2.3.s390x.rpm

x86_64:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-perl-1.0.0-20.el6_2.3.i686.rpm
openssl-static-1.0.0-20.el6_2.3.i686.rpm

ppc64:
openssl-debuginfo-1.0.0-20.el6_2.3.ppc64.rpm
openssl-perl-1.0.0-20.el6_2.3.ppc64.rpm
openssl-static-1.0.0-20.el6_2.3.ppc64.rpm

s390x:
openssl-debuginfo-1.0.0-20.el6_2.3.s390x.rpm
openssl-perl-1.0.0-20.el6_2.3.s390x.rpm
openssl-static-1.0.0-20.el6_2.3.s390x.rpm

x86_64:
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-perl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-static-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm

x86_64:
openssl-1.0.0-20.el6_2.3.i686.rpm
openssl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-devel-1.0.0-20.el6_2.3.i686.rpm
openssl-devel-1.0.0-20.el6_2.3.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/openssl-1.0.0-20.el6_2.3.src.rpm

i386:
openssl-debuginfo-1.0.0-20.el6_2.3.i686.rpm
openssl-perl-1.0.0-20.el6_2.3.i686.rpm
openssl-static-1.0.0-20.el6_2.3.i686.rpm

x86_64:
openssl-debuginfo-1.0.0-20.el6_2.3.x86_64.rpm
openssl-perl-1.0.0-20.el6_2.3.x86_64.rpm
openssl-static-1.0.0-20.el6_2.3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-0884.html
https://www.redhat.com/security/data/cve/CVE-2012-1165.html
https://access.redhat.com/security/updates/classification/#moderate
https://rhn.redhat.com/errata/RHSA-2012-0060.html
https://rhn.redhat.com/errata/RHSA-2012-0059.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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