OpenSSL TLS handshake Denial of Service

Overview

A vulnerability exists in OpenSSL that may allow a remote attacker to cause a denial of service.

Description

OpenSSL contains a vulnerability in the way specially crafted TLS handshake packets are handled that may result in a denial of service. According to OpenSSL Security Advisory [28-Mar-2008]:

… if the ‘Server Key exchange message’ is omitted from a TLS handshake in OpenSSL 0.9.8f and OpenSSL 0.9.8g. If a client connects to a malicious server with particular cipher suites, the server could cause the client to crash.

Note that this issue may affect OpenSSL versions prior to 0.9.8h.

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Impact

A remote, unauthorized attacker may be able to cause a denial of service.

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Solution

Upgrade or Apply Patch
OpenSSL has issued an upgrade and a patch to address this issue. See OpenSSL Security Advisory [28-Mar-2008] for more information. OpenSSL is included in various Linux and UNIX distributions. Please consult the relevant documentation of your distribution to obtain the appropriate updates.

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Vendor Information

520586

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OpenSSL __ Affected

Updated: May 30, 2008

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

OpenSSL has issued an upgrade and a patch to address this issue. See OpenSSL Security Advisory [28-Mar-2008] for more information.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23520586 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.securityfocus.com/bid/29405&gt;
• <http://cert.fi/haavoittuvuudet/2008/advisory-openssl.html&gt;
• <http://secunia.com/advisories/30405/&gt;
• <http://www.openssl.org/news/secadv_20080528.txt&gt;

Acknowledgements

This issue was reported in OpenSSL Security Advisory [28-Mar-2008]. OpenSSL credits Codenomicon for reporting these issues.

This document was written by Chris Taschner.

Other Information

CVE IDs:	CVE-2008-1672
Severity Metric:	14.70 Date Public: