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Vulnerability Alert

Cisco IPS IDSM-2 Malformed TCP Packets Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:30026
Version:1
First Published:2013 July 17 16:23 GMT
Last Published:2013 July 17 16:23 GMT
Port: Not available
CVE:CVE-2013-3411
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.0
 
Version Summary:Cisco IPS Intrusion Detection System Module contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are not available.
 
 
Description
A vulnerability in the IDSM-2 drivers could allow an unauthenticated, remote attacker to cause the system kernel to become unresponsive. This creates a denial of service (DoS) condition because the Cisco IPS sensor is not able to execute several critical tasks, including alert notification, event store management, sensor authentication, and traffic inspection. The Cisco IPS web server will also be unavailable.

The vulnerability is due to improper handling of malformed TCP packets from the management interface of the affected system. An attacker may exploit this vulnerability by sending malformed IP packets to the management interface. A TCP three-way handshake is not required to exploit this vulnerability. A hard system reboot is needed to restore the functionality of the system.

The vulnerability can be triggered only by IPv4 traffic directed to the management interface. Traffic passing through the sensing interfaces will not trigger this vulnerability.

Cisco has confirmed the vulnerability in a security advisory; however, software updates are not available.
 
Warning Indicators
The following versions of Cisco Catalyst 6500 Series IDSM-2 are affected:
  • 5.0, 5.0(1), 5.0(2), 5.0(3), 5.0(4), 5.0(5), and 5.0(6)
  • 5.1, 5.1(1), 5.1(1a), 5.1(1b), 5.1(1c), 5.1(1d), 5.1(1e), 5.1(p1), 5.1(2), 5.1(5), and 5.1(6)
  • 6.0, 6.0(2), 6.0(3), and 6.0(4)
  • 6.1
  • 7.0
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for bug ID CSCuh27460 at the following link: cisco-sa-20130717-ips
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause the targeted device to become unresponsive, leading to a DoS condition.
 
Technical Information
Technical details are not available.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to use the access-list command to limit the number of hosts (IP addresses) allowed to connect to the management interface of system.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Multiple Vulnerabilities in Cisco Intrusion Prevention System Software

Prevent disruption of communication between devices by reducing the impact of attacks which may directly impact the CPU performance of the individual devices. For control plane hardening best practices, see the Cisco Guide to Harden Cisco IOS Devices.

Understanding activity on the network provides information and visibility that can be used to identify potential security incidents. Organizations should log events from devices and review the logged data to provide insight into anomalies or malicious activity. For logging best practices, see the Cisco Guide to Harden Cisco IOS Devices.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial-of-service (DoS) attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.

Network traffic should be monitored security-related network activity. NetFlow identifies security-related network activity. For NetFlow configuration details, see the Introduction to Cisco IOS NetFlow - A Technical Overview.

Administrators are advised to monitor affected systems.
 
Patches/Software
Vendor updates are not available. Please see the "Workarounds" section of the security advisory.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoIntrusion Prevention System (IPS) 5.0 (1), (2), (3), (4), (5), (6) | 5.1 (1), (1a), (1b), (1c), (1d), (1e), (p1), (2), (5), (6) | 6.0 Base, (2), (3), (4) | 6.1 Base | 7.0 Base

Associated Products:
N/A




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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