GnuTLS Pad Length Denial of Service

Overview

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

Description

GnuTLS contains a vulnerability in gnults-serv that may result in a denial of service when handling a sequence of specially crafted packets. According to CERT-FI Vulnerability Advisory on GnuTLS:

_We have found the flaw by doing complete TLS 1.0 handshake followed by a encrypted Client-Hello message to start abbreviated handshake. In this case the the Re__cord Length field of the TLS Record containing the Client Hello contains erroneus value ‘8’ triggering the bug. __Note that this might not be the only way to reproduce the bug. _

Note that this issue may affect GnuTLS versions prior to 2.2.5 and also affects version 2.3.0.

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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
GnuTLS has issued an upgrade and a patch to address this issue. See GnuTLS Security Advisory SA-2008-01 for more information. GnuTLS 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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GnuTLS __ 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 GnuTLS Security Advisory SA-2008-01 for more information.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23659209 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.cert.fi/haavoittuvuudet/advisory-gnutls.html&gt;
• <http://lists.gnu.org/archive/html/gnutls-devel/2008-05/msg00060.html&gt;
• <http://secunia.com/advisories/30287/&gt;
• <http://secunia.com/advisories/30330/&gt;

Acknowledgements

This issue was reported in GnuTLS Security Advisory SA-2008-01. GnuTLS credits Ossi Herrala and Jukka Taimisto from the CROSS project at Codenomicon Ltd. for reporting this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs:	CVE-2008-1950
Severity Metric:	16.54 Date Public: