Vulnerability Alert

Cisco IOS and IOS XE Software IP Service Level Agreement Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:28650
Version:2
First Published:2013 March 27 16:05 GMT
Last Published:2013 April 15 20:56 GMT
Port: 1967
CVE:CVE-2013-1148
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:IntelliShield has updated this alert to add affected products related to the Cisco IOS and IOS XE Software IP Service Level Agreement denial of service vulnerability.
 
 
Description
A vulnerability exists in the implementation of the IP Service Level Agreement responder feature of Cisco IOS Software that could allow an unauthenticated, remote attacker to cause a reload of the vulnerable device.

The vulnerability is due to improper validation of IP SLA packets on UDP port 1167. An attacker could exploit this vulnerability by sending malformed IP SLA packets addressed to the affected device. An exploit could allow the attacker to cause an extended DoS condition.

Cisco confirmed the vulnerability in a security advisory and released updated software.
 
Warning Indicators
Cisco devices running an affected version of Cisco IOS and IOS XE Software and have a vulnerable IP SLA general responder configuration are affected.

Cisco has published a list of affected Cisco IOS and IOS XE Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
 
IntelliShield Analysis
It is likely that an attacker would need to have access to an internal, private network to send crafted IP SLA packets to a targeted device. This access requirement decreases 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 Cisco bug ID CSCuc72594 at the following link: cisco-sa-20130327-ipsla
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reload. Repeated exploitation could result in a sustained DoS condition.
 
Technical Information
The vulnerability is due to improper validation of IP SLA packets on UDP port 1167 by the IP Service Level Agreement responder feature used by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted IP SLA packets to the affected port. If the attack is successful, the attacker could cause an affected device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

Apply hardware rate limiter features to limit packets requiring processing by the device's CPU in order to mitigate denial-of-service (DoS) attacks. See your vendor's documentation for specific configuration instructions. For hardware rate limiting configuration details, consult the Cisco Catalyst 6500 Denial of Service (DoS) Protection Configuration Guide.

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 Cisco IOS Software IP Service Level Agreement Vulnerability

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 e-mail at tac@cisco.com.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
1819/0IOS IPSLA DoSS7042013 Mar 27 
 
Alert History
 

Version 1, March 27, 2013, 4:05 PM: Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.



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

Primary Products:
CiscoCisco IOS XE Software 3.1S .0, .1, .2, .3 | 3.2S .0, .1, .2 | 3.3S .0, .1, .2 | 3.4S .0, .1, .2, .3, .4 | 3.5S Base, .0, .1, .2 | 3.6S Base, .0, .1, .2 | 3.7S Base, .0, .1

Associated Products:
CiscoIOS 15.2M 15.2(4)M, 15.2(4)M1, 15.2(4)M2 | 15.2S 15.2(4)S, 15.2(4)S0c, 15.2(4)S0xb, 15.2(4)S1 | 15.2XB 15.2(4)XB10




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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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