Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the openssl packages
Detailed Explanation for this Vulnerability Assessment
Updated OpenSSL packages are available that fix a potential timing-based
[Updated 12 March 2003]
Added packages for Red Hat Enterprise Linux ES and Red Hat Enterprise
OpenSSL is a commercial-grade, full-featured, open source toolkit which
implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer
Security (TLS v1) protocols as well as a full-strength, general purpose
In a paper, Brice Canvel, Alain Hiltgen, Serge Vaudenay, and Martin
Vuagnoux describe and demonstrate a timing-based attack on CBC ciphersuites
in SSL and TLS. An active attacker may be able to use timing observations
to distinguish between two different error cases: cipher padding errors and
MAC verification errors. Over multiple connections this can leak
sufficient information to be able to retrieve the plaintext of a common,
In order for an attack to be sucessful a possible hacker must be able to act as a
man-in-the-middle to intercept and modify multiple connections which all
involve a common fixed plaintext block (such as a password), and have good
network conditions that permit small changes in timing to be reliably
These updated packages contain a patch provided by the OpenSSL group that
corrects this vulnerability.
Because server applications are affected by these vulnerabilities, we
advise users to restart all services that use OpenSSL functionality or
alternatively reboot their systems after installing these updates.
Solution : http://rhn.redhat.com/errata/RHSA-2003-063.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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