Vulnerability Note VU#258555

OpenSSL clients contain a buffer overflow during the SSL3 handshake process

Overview

OpenSSL is an open-source implementation of the Secure Sockets Layer (SSL) protocol. A remotely exploitable vulnerability exists in OpenSSL clients that could lead to the execution of arbitrary code on the client's system.

I. Description

OpenSSL clients using SSLv3 prior to version 0.9.6e and pre-release version 0.9.7-beta2 contain a buffer overflow vulnerability. A malicious server can exploit this by sending a large session ID to the client during the handshake process.

II. Impact

A remote attacker may be able to execute arbitrary code on the client system with the privileges of the current user.

III. Solution

Apply the relevant patches to the OpenSSL client or upgrade to OpenSSL 0.9.6e. Note that applications statically linking to OpenSSL libraries may need to be recompiled with the corrected version of OpenSSL.

Systems Affected

Vendor	Status	Date Notified
Alcatel	Vulnerable	20-Sep-2002
Apache	Unknown	9-Aug-2002
Apache-SSL	Unknown	9-Aug-2002
Apple Computer Inc.	Vulnerable	9-Aug-2002
Covalent	Unknown	9-Aug-2002
Debian	Vulnerable	9-Aug-2002
Gentoo Linux	Vulnerable	9-Aug-2002
Guardian Digital	Vulnerable	9-Aug-2002
Hewlett-Packard Company	Vulnerable	9-Aug-2002
IBM	Vulnerable	9-Aug-2002
Juniper Networks	Vulnerable	16-Aug-2002
Lotus Development Corporation	Not Vulnerable	9-Aug-2002
MandrakeSoft	Vulnerable	23-Sep-2002
Microsoft Corporation	Not Vulnerable	26-Sep-2002
NCSA	Unknown	9-Aug-2002
NetBSD	Vulnerable	23-Sep-2002
OpenLDAP	Vulnerable	9-Aug-2002
OpenPKG	Vulnerable	9-Aug-2002
OpenSSL	Vulnerable	30-Jul-2002
Oracle	Vulnerable	9-Aug-2002
Red Hat Inc.	Vulnerable	9-Aug-2002
Secure Computing Corporation	Vulnerable	30-Sep-2002
SuSE	Vulnerable	23-Sep-2002
Trustix	Vulnerable	9-Aug-2002

References

http://www.kb.cert.org/vuls/id/102795
http://www.kb.cert.org/vuls/id/308891
http://www.kb.cert.org/vuls/id/561275
http://www.kb.cert.org/vuls/id/748355
http://wp.netscape.com/eng/ssl3/draft302.txt
http://www.securityfocus.com/bid/5362

Credit

Thanks to A.L. Digital Ltd for discovering and reporting on this vulnerability.

This document was written by Jason A Rafail and Jeffrey S. Havrilla.

Other Information

Date Public:	2002-07-30
Date First Published:	2002-07-30
Date Last Updated:	2002-09-30
CERT Advisory:	CA-2002-23
CVE-ID(s):	CAN-2002-0656
NVD-ID(s):	CAN-2002-0656
US-CERT Technical Alerts:
Metric:	3.19
Document Revision:	37

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