OpenSSL Server Name extension 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 server name extension data is handled that may result in a denial of service. According to OpenSSL Security Advisory [28-Mar-2008]:

If OpenSSL has been compiled using the non-default TLS server name extensions, a remote attacker could send a carefully crafted packet to a server application using OpenSSL and cause it 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

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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

Refer to 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%23661475 Feedback>).

CVSS Metrics

Group	Score	Vector
Base	0	AV:–/AC:–/Au:–/C:–/I:–/A:–
Temporal	0	E:ND/RL:ND/RC:ND
Environmental	0	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

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-2008-0891
Severity Metric:	14.88 Date Public: