Date:         Thu, 25 Mar 2010 10:55:13 -0500
Reply-To:     Troy Dawson 
Sender:       Security Errata for Scientific Linux
              
From:         Troy Dawson 
Subject:      Security ERRATA Important: openssl on SL5.x i386/x86_64
Comments: To: "scientific-linux-errata@fnal.gov"
          

Synopsis:	Important: openssl security update
Issue date:	2010-03-25
CVE Names:	CVE-2009-3245 CVE-2009-3555 CVE-2010-0433

CVE-2009-3555 TLS: MITM attacks via session renegotiation
CVE-2010-0433 openssl: crash caused by a missing 
krb5_sname_to_principal() return value check
CVE-2009-3245 openssl: missing bn_wexpand return value checks

It was discovered that OpenSSL did not always check the return value of 
the bn_wexpand() function. An attacker able to trigger a memory 
allocation failure in that function could cause an application using the 
OpenSSL library to crash or, possibly, execute arbitrary code. 
(CVE-2009-3245)

A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure
Sockets Layer) protocols handled session renegotiation. A 
man-in-the-middle attacker could use this flaw to prefix arbitrary plain 
text to a client's session (for example, an HTTPS connection to a 
website). This could force the server to process an attacker's request 
as if authenticated using the victim's credentials. This update 
addresses this flaw by implementing the TLS Renegotiation Indication 
Extension, as defined in RFC 5746. (CVE-2009-3555)

Refer to the following Knowledgebase article for additional details 
about the CVE-2009-3555 flaw: 
A missing return value check flaw was discovered in OpenSSL, that could
possibly cause OpenSSL to call a Kerberos library function with invalid
arguments, resulting in a NULL pointer dereference crash in the MIT
Kerberos library. In certain configurations, a remote attacker could use
this flaw to crash a TLS/SSL server using OpenSSL by requesting Kerberos
cipher suites during the TLS handshake. (CVE-2010-0433)

For the update to take effect, all services linked to the OpenSSL 
library must be restarted, or the system rebooted.

SL 5.x

     SRPMS:
openssl-0.9.8e-12.el5_4.6.src.rpm
     i386:
openssl-0.9.8e-12.el5_4.6.i386.rpm
openssl-0.9.8e-12.el5_4.6.i686.rpm
openssl-devel-0.9.8e-12.el5_4.6.i386.rpm
openssl-perl-0.9.8e-12.el5_4.6.i386.rpm
     x86_64:
openssl-0.9.8e-12.el5_4.6.i686.rpm
openssl-0.9.8e-12.el5_4.6.x86_64.rpm
openssl-devel-0.9.8e-12.el5_4.6.i386.rpm
openssl-devel-0.9.8e-12.el5_4.6.x86_64.rpm
openssl-perl-0.9.8e-12.el5_4.6.x86_64.rpm

-Connie Sieh
-Troy Dawson