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Cisco ASA clientless SSL VPN denial of service vulnerability

Vulnerability Note VU#337508

Original Release Date: 2007-05-03 | Last Revised: 2007-05-04

Overview

The Cisco ASA firewall's SSL VPN component contains an denial-of-service vulnerability.

Description

The Cisco Adaptive Security Appliance (ASA) is firewall that includes routing, intrusion prevention system (IPS), and VPN components. The clientless SSL VPN allows remote users with a web browser to connect to internal web sites by tunneling an HTTPS session through the ASA.

The ASA's SSL VPN component contains a denial of service vulnerability.

Per Cisco Security Advisory cisco-sa-20070502-asa:
A successful attack must exploit a race condition in the processing non-standard SSL sessions and may result in a reload of the device.

Impact

A remote unauthenticated attacker may be able to to create a denial-of-service condition. Note that any systems that rely on the affected device would also be affected.

Solution

Upgrade

Cisco has released an update to address this vulnerability. See the Software Versions and Fixes section of Cisco Security Advisory cisco-sa-20070502-asa for more details.

Vendor Information

337508
 
Affected   Unknown   Unaffected

Cisco Systems, Inc.

Updated:  May 03, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

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

Cisco Systems, Inc.

Updated:  May 03, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

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

Addendum

See http://www.cisco.com/en/US/products/products_security_advisory09186a0080833166.shtml#fixes for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

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

References

Acknowledgements

Thanks to Cisco for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

CVE IDs: None
Severity Metric: 0.70
Date Public: 2007-05-02
Date First Published: 2007-05-03
Date Last Updated: 2007-05-04 20:27 UTC
Document Revision: 11

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.