Vulnerability Alert

Cisco IOS Software Internet Key Exchange Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:28646
Version:1
First Published:2013 March 27 16:10 GMT
Last Published:2013 March 27 16:10 GMT
Port: Not available
CVE:CVE-2013-1144
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 Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
 
 
Description
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to insufficient validation of Internet Key Exchange (IKE) packets by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sending specific IKE packets to a device configured with features that leverage IKEv1. A successful exploit could allow the attacker to cause a memory leak. A sustained attack could cause the device to reload or become unresponsive, resulting in a DoS condition for legitimate users.
 
Warning Indicators
Cisco has published a list of affected Cisco IOS Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
 
IntelliShield Analysis
If the network is experiencing active exploitation, the Crypto IKE Dis count will increase. To identify if a device is being exploited by this vulnerability, examine the contents of the old buffers. A device that is affected by this vulnerability will show a buffer leak in the Crypto IKE Dis user and will show buffers being leaked in Crypto IK.

This vulnerability can be exploited via either IPv4 or IPv6. Only traffic destined to the device can trigger the vulnerability; transit traffic is not an exploit vector.

An attacker must be able to send malicious packets to the targeted device to exploit the vulnerability and may require access to trusted, internal networks. This access requirement may reduce the likelihood of a successful attack.

Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCth81055 at the following link: cisco-sa-20130327-ike
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a memory leak on a targeted device. A sustained attack could cause the device to reload or become unresponsive, resulting in a DoS condition for legitimate users.
 
Technical Information
The vulnerability is due to insufficient validation of IKE packets by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending specific IKE packets to a device configured with features that leverage IKEv1. When the malicious packets are processed by the affected software, improper memory operations could result in a memory leak. A successful exploit could allow the attacker to use the memory leak to cause the device to reload or become unresponsive, resulting in a DoS condition for legitimate users.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators may consider implementing a Cisco IOS Embedded Event Manager (EEM) policy that can be used on vulnerable Cisco IOS devices to identify and detect a memory leak that is caused by this vulnerability. The policy script is available at the following link: Cisco Beyond: Embedded Event Manager (EEM) Scripting Community

Apply hardware rate limiter features to limit packets that require processing by the device's CPU to mitigate DoS attacks.

Administrators are advised to monitor critical 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 e-mail at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
N/A

Associated Products:
CiscoIOS 15.1GC 15.1(2)GC, 15.1(2)GC1, 15.1(2)GC2 | 15.1T 15.1(1)T, 15.1(1)T1, 15.1(1)T2, 15.1(1)T3, 15.1(1)T4, 15.1(1)T5, 15.1(2)T, 15.1(2)T0a, 15.1(2)T1, 15.1(2)T2, 15.1(2)T2a, 15.1(2)T3, 15.1(2)T4, 15.1(2)T5 | 15.1XB 15.1(1)XB, 15.1(1)XB1, 15.1(1)XB2, 15.1(1)XB3




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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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