Vulnerability Note VU#102795

OpenSSL servers contain a buffer overflow during the SSL2 handshake process

Original Release date: 30 Jul 2002 | Last revised: 30 Sep 2002


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


Versions of OpenSSL servers prior to 0.9.6e and pre-release version 0.9.7-beta2 contain a remotely exploitable buffer overflow vulnerability. This vulnerability can be exploited by a client using a malformed key during the handshake process with an SSL server connection using the SSLv2 communication process.


Exploitation of this vulnerability could lead to the execution of arbitrary code on the server. The code will be executed with the privileges of the application or service exploited via this vulnerability.


OpenSSL servers should apply the patches provided by your vendors, 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.

Servers can disable SSL2 or disable all applications using SSL or TLS until the patches are applied.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Apple Computer Inc.Affected29 Jul 200209 Aug 2002
CovalentAffected30 Jul 200217 Sep 2002
DebianAffected29 Jul 200209 Aug 2002
Gentoo LinuxAffected-09 Aug 2002
Guardian DigitalAffected29 Jul 200209 Aug 2002
Hewlett-Packard CompanyAffected29 Jul 200209 Aug 2002
IBMAffected29 Jul 200209 Aug 2002
Juniper NetworksAffected-16 Aug 2002
MandrakeSoftAffected-23 Sep 2002
NetBSDAffected29 Jul 200223 Sep 2002
OpenLDAPAffected29 Jul 200209 Aug 2002
OpenPKGAffected-09 Aug 2002
OpenSSLAffected22 Jul 200230 Jul 2002
OracleAffected29 Jul 200209 Aug 2002
Red Hat Inc.Affected29 Jul 200209 Aug 2002
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



The CERT/CC thanks Greg Shipley of Neohapsis for reporting this issue to us. John McDonald is credited for discovering this issue. It was also found independently by A.L. Digital Ltd.

This document was written by Jason A Rafail.

Other Information

  • CVE IDs: CAN-2002-0656
  • CERT Advisory: CA-2002-23
  • Date Public: 30 Jul 2002
  • Date First Published: 30 Jul 2002
  • Date Last Updated: 30 Sep 2002
  • Severity Metric: 17.63
  • Document Revision: 37


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