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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.
Vulnerability Assessment Details
Check for the version of the openssl packages
Detailed Explanation for this Vulnerability Assessment
Updated OpenSSL packages are available that fix ASN.1 parsing
OpenSSL is a commercial-grade, full-featured, and open source 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
NISCC testing of implementations of the SSL protocol uncovered two bugs in
OpenSSL 0.9.6. The parsing of unusual ASN.1 tag values can cause OpenSSL to
crash. A remote attacker could trigger this bug by sending a carefully
crafted SSL client certificate to an application. The effects of such an
attack vary depending on the application targetted
against Apache the
effects are limited, as the attack would only cause child processes to die
and be replaced. An attack against other applications that use OpenSSL
could result in a Denial of Service. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the names CVE-2003-0543 and
CVE-2003-0544 to this issue.
These erratum packages contain a patch provided by the OpenSSL group that
protects against this issue.
Because server applications are affected by this issue, users are advised
to either restart all services that use OpenSSL functionality or reboot
their systems after installing these updates.
Red Hat would like to thank NISCC and Stephen Henson for their work on this
These packages also include a patch from OpenSSL 0.9.6f which removes
the calls to abort the process in certain circumstances. Red Hat would
like to thank Patrik Hornik for notifying us of this issue.
Solution : http://rhn.redhat.com/errata/RHSA-2003-293.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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