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Vulnerability Alert

Cisco IOS XE Software PPTP Traffic Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31453
Version:1
First Published:2013 October 30 16:20 GMT
Last Published:2013 October 30 16:20 GMT
Port: Not available
CVE:CVE-2013-5545
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the PPTP ALG feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.

The vulnerability is due to the improper handling of PPTP packets that are being inspected as part of the NAT feature on Cisco IOS XE Software. An attacker could exploit this vulnerability by sending a large number of PPTP packets to traverse a vulnerable system that is configured for NAT.

A successful exploit could allow the attacker to cause a system to reload, resulting in a DoS condition. Repeated exploitation could result in a sustained DoS condition.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco IOS XE Software versions prior to 3.9.2S are affected.
 
IntelliShield Analysis
Only systems performing ALG and NAT inspection are vulnerable to exploitation, likely reducing the number of vulnerable systems in most environments.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCuh19936 at the following link: cisco-sa-20131030-asr1000
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a vulnerable device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of PPTP packets by the Cisco IOS XE network address translation (NAT) and application layer gateway (ALG) features.

An unauthenticated, remote attacker could exploit this vulnerability by sending a large series of PPTP packets designed to traverse interfaces on a vulnerable device. The inspection of the PPTP packets could cause the device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco IOS XE Software 3.9S .0, .1

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


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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