Multiple Cisco products consume excessive CPU resources in response to large SSH packets

Overview

Multiple Cisco networking products contain a denial-of-service vulnerability.

Description

Multiple Cisco networking products contain a vulnerability that allows large SSH packets to cause excessive consumption of CPU resources. In some circumstances, this resource consumption may cause the affected device to reboot.

This vulnerability is a side effect of a Cisco patch for VU#13877, an SSH packet injection vulnerability. Please note that this patch does not contain the integer overflow vulnerability described in VU#945216. However, according to Cisco’s Security Advisory, this denial-of-service vulnerability may be triggered by attempts to exploit VU#945216.

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Impact

Remote attackers may conduct denial-of-service attacks against affected devices.

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Solution

Apply a patch

Cisco has published a Security Advisory to address this vulnerability. For information regarding affected devices and obtaining patches, please see

http://www.cisco.com/warp/public/707/SSH-scanning.shtml

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Vendor Information

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Cisco Systems Inc. __ Affected

Notified: June 27, 2002 Updated: June 28, 2002

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

Cisco has published a Security Advisory to address this vulnerability. For information regarding affected devices and obtaining patches, please see

http://www.cisco.com/warp/public/707/SSH-scanning.shtml

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23290140 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.cisco.com/warp/public/707/SSH-scanning.shtml&gt;
• <http://www.cert.org/advisories/CA-2001-35.html&gt;
• <http://www.kb.cert.org/vuls/id/945216&gt;
• <http://www.kb.cert.org/vuls/id/13877&gt;
• <http://www.securityfocus.com/bid/5114&gt;

Acknowledgements

This document was written by Jeffrey P. Lanza and is based on information provided by Cisco.

Other Information

CVE IDs:	CVE-2002-1024
Severity Metric:	21.09 Date Public: