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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Red Hat Issues Fix) OpenSSL Stored Session Cache Modification Bug May Let Remote Users Downgrade the Ciphersuite
SecurityTracker Alert ID:  1024864
SecurityTracker URL:  http://securitytracker.com/id/1024864
CVE Reference:   CVE-2010-4180   (Links to External Site)
Date:  Dec 13 2010
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.9.8q, 1.0.0 prior to 1.0.0c
Description:   A vulnerability was reported in OpenSSL. A remote user can cause the ciphersuite to be downgraded.

A remote client user can modify the stored session cache ciphersuite, which may cause the ciphersuite to be downgraded to a weaker one on subsequent connections.

Martin Rex reported reported this vulnerability.
Impact:   A remote user can cause the ciphersuite to be downgraded.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0979.html
Vendor URL:  openssl.org/news/secadv_20101202.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.
Dec 3 2010 OpenSSL Stored Session Cache Modification Bug May Let Remote Users Downgrade the Ciphersuite


 Source Message Contents
Date:  Mon, 13 Dec 2010 13:48:20 -0500
Subject:  [RHSA-2010:0979-01] Moderate: openssl security update

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

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

Synopsis:          Moderate: openssl security update
Advisory ID:       RHSA-2010:0979-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0979.html
Issue date:        2010-12-13
CVE Names:         CVE-2010-4180 
=====================================================================

1. Summary:

Updated openssl packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

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 ciphersuite downgrade flaw was found in the OpenSSL SSL/TLS server code.
A remote attacker could possibly use this flaw to change the ciphersuite
associated with a cached session stored on the server, if the server
enabled the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG option, possibly
forcing the client to use a weaker ciphersuite after resuming the session.
(CVE-2010-4180)

Note: With this update, setting the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
option has no effect and this bug workaround can no longer be enabled.

All OpenSSL users should upgrade to these updated packages, which contain a
backported patch to resolve this issue. 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
http://kbase.redhat.com/faq/docs/DOC-11259

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

659462 - CVE-2010-4180 openssl: NETSCAPE_REUSE_CIPHER_CHANGE_BUG ciphersuite downgrade attack

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/openssl-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm

x86_64:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.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-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm
openssl-perl-1.0.0-4.el6_0.2.i686.rpm
openssl-static-1.0.0-4.el6_0.2.i686.rpm

x86_64:
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.x86_64.rpm
openssl-perl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-static-1.0.0-4.el6_0.2.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-1.0.0-4.el6_0.2.src.rpm

x86_64:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.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-1.0.0-4.el6_0.2.src.rpm

x86_64:
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.x86_64.rpm
openssl-perl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-static-1.0.0-4.el6_0.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/openssl-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm

ppc64:
openssl-1.0.0-4.el6_0.2.ppc.rpm
openssl-1.0.0-4.el6_0.2.ppc64.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.ppc.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.ppc64.rpm
openssl-devel-1.0.0-4.el6_0.2.ppc.rpm
openssl-devel-1.0.0-4.el6_0.2.ppc64.rpm

s390x:
openssl-1.0.0-4.el6_0.2.s390.rpm
openssl-1.0.0-4.el6_0.2.s390x.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.s390.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.s390x.rpm
openssl-devel-1.0.0-4.el6_0.2.s390.rpm
openssl-devel-1.0.0-4.el6_0.2.s390x.rpm

x86_64:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.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-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-perl-1.0.0-4.el6_0.2.i686.rpm
openssl-static-1.0.0-4.el6_0.2.i686.rpm

ppc64:
openssl-debuginfo-1.0.0-4.el6_0.2.ppc64.rpm
openssl-perl-1.0.0-4.el6_0.2.ppc64.rpm
openssl-static-1.0.0-4.el6_0.2.ppc64.rpm

s390x:
openssl-debuginfo-1.0.0-4.el6_0.2.s390x.rpm
openssl-perl-1.0.0-4.el6_0.2.s390x.rpm
openssl-static-1.0.0-4.el6_0.2.s390x.rpm

x86_64:
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-perl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-static-1.0.0-4.el6_0.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/openssl-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm

x86_64:
openssl-1.0.0-4.el6_0.2.i686.rpm
openssl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-devel-1.0.0-4.el6_0.2.i686.rpm
openssl-devel-1.0.0-4.el6_0.2.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-1.0.0-4.el6_0.2.src.rpm

i386:
openssl-debuginfo-1.0.0-4.el6_0.2.i686.rpm
openssl-perl-1.0.0-4.el6_0.2.i686.rpm
openssl-static-1.0.0-4.el6_0.2.i686.rpm

x86_64:
openssl-debuginfo-1.0.0-4.el6_0.2.x86_64.rpm
openssl-perl-1.0.0-4.el6_0.2.x86_64.rpm
openssl-static-1.0.0-4.el6_0.2.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-2010-4180.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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