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Vulnerability Assessment & Network Security Forums |
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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. Home >> Browse Vulnerability Assessment Database >> Red Hat Local Security Checks >> RHSA-2003-063: openssl Vulnerability Assessment Details
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RHSA-2003-063: openssl |
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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 attack. [Updated 12 March 2003] Added packages for Red Hat Enterprise Linux ES and Red Hat Enterprise Linux WS 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 cryptography library. 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, fixed block. 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 observed. 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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