Cisco ACNS RealServer RealSubscruber vulnerable to DoS via malformed IP packets

Overview

A vulnerability in Cisco ACNS RealServer RealSubscriber may allow a remote attacker to cause a denial of service on an affected device via malformed IP packets.

Description

Cisco Application and Content Networking System (ACNS) is an integrated caching and content-delivery platform. ACNS 5.1 includes RealServer as an optional component. RealSubscriber is RealServer configured for subscriber-only mode. RealSubscriber is disabled by default. Specially crafted packets may cause RealSubscriber to consume 100% of the CPU of an affected device. A reboot of the device is required to recover.

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Impact

A remote, unauthenticated attacker could cause a denial-of-service condition on an affected system.

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Solution

Apply a patch or upgrade

Please refer to the “Software Versions and Fixes” section of the Cisco Security Advisory for more information on upgrading.

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Disable RealSubscriber

Please see the “Workarounds” section of the Cisco Security Advisory for information about how to disable RealSubscriber.

Restrict access

Use Access Control Lists (ACLs) to block or restrict access to affected devices from untrusted networks. Please see the “Workarounds” section of the Cisco Security Advisory.

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Vendor Information

579240

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Cisco Systems Inc. __ Affected

Updated: February 28, 2005

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

Please see the Cisco Security Advisory.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23579240 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.cisco.com/warp/public/707/cisco-sa-20050224-acnsdos.shtml&gt;
• <http://www.cisco.com/univercd/cc/td/doc/product/webscale/uce/acns51/deploy51/51stream.htm#wp1039106&gt;
• <http://secunia.com/advisories/14395/&gt;
• <http://securitytracker.com/alerts/2005/Feb/1013286.html&gt;
• <http://xforce.iss.net/xforce/xfdb/19469&gt;
• <http://osvdb.org/displayvuln.php?osvdb_id=14122&gt;

Acknowledgements

This vulnerability was reported by the Cisco Systems Product Security Incident Response Team (PSIRT).

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2005-0598
Severity Metric:	3.47 Date Public: