Date:         Thu, 18 Oct 2007 16:43:05 -0500
Reply-To:     Troy Dawson 
Sender:       Security Errata for Scientific Linux
              
From:         Troy Dawson 
Subject:      Security ERRATA for openssl on SL5.x i386/x86_64
Comments: To: scientific-linux-errata@fnal.gov

Synopsis:	Important: openssl security update
Issue date:	2007-10-12
CVE Names:	CVE-2007-3108 CVE-2007-4995 CVE-2007-5135

OpenSSL is a toolkit that implements Secure Sockets Layer (SSL v2/v3) and
Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library. Datagram TLS (DTLS) is a protocol
based on TLS that is capable of securing datagram transport (UDP for
instance).

The OpenSSL security team discovered a flaw in DTLS support.  An attacker
could create a malicious client or server that could trigger a heap
overflow. This is possibly exploitable to run arbitrary code, but it has
not been verified  (CVE-2007-5135). Note that this flaw only affects
applications making use of DTLS. Scientific Linux does not ship any DTLS client 
or server applications.

A flaw was found in the SSL_get_shared_ciphers() utility function. An
attacker could send a list of ciphers to an application that used this
function and overrun a buffer with a single byte (CVE-2007-4995). Few
applications make use of this vulnerable function and generally it is used
only when applications are compiled for debugging.

A number of possible side-channel attacks were discovered affecting
OpenSSL. A local attacker could possibly obtain RSA private keys being
used on a system. In practice these attacks would be difficult to perform
outside of a lab environment. This update contains backported patches
designed to mitigate these issues.  (CVE-2007-3108).

Users of OpenSSL should upgrade to these updated packages, which contain
backported patches to resolve these issues.

Please note that the fix for the DTLS flaw involved an overhaul of the DTLS
handshake processing which may introduce incompatibilities if a new client
is used with an older server.

After installing this update, users are advised to either restart all
services that use OpenSSL or restart their system.

SL 5.x

   SRPMS:
openssl-0.9.8b-8.3.el5.2.src.rpm
   i386:
openssl-0.9.8b-8.3.el5.2.i386.rpm
openssl-0.9.8b-8.3.el5.2.i686.rpm
openssl-devel-0.9.8b-8.3.el5.2.i386.rpm
openssl-perl-0.9.8b-8.3.el5.2.i386.rpm
   x86_64:
openssl-0.9.8b-8.3.el5.2.i686.rpm
openssl-0.9.8b-8.3.2.x86_64.rpm
openssl-devel-0.9.8b-8.3.el5.2.i386.rpm
openssl-devel-0.9.8b-8.3.2.x86_64.rpm
openssl-perl-0.9.8b-8.3.2.x86_64.rpm

-Connie Sieh
-Troy Dawson