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Home >> Browse Vulnerability Assessment Database >> Red Hat Local Security Checks >> RHSA-2003-293: openssl

Vulnerability Assessment Details

RHSA-2003-293: openssl

Vulnerability Assessment Summary
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 ( 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 :
Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security

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