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Vulnerability Alert

Cisco IOS Software Smart Install Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:28648
Version:2
First Published:2013 March 27 16:25 GMT
Last Published:2013 May 24 19:16 GMT
Port: 4786
CVE:CVE-2013-1146
BugTraq ID:58746
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Applied Mitigation BulletinView related Event Response
 
 
Version Summary:Additional technical information is available to describe the Cisco IOS Software Smart Install denial of service vulnerability.
 
 
Description
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on vulnerable installations of Cisco IOS.

Cisco devices that have Smart Install client feature enabled in their IOS Software are vulnerable. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious packets to the SMI IBC server. If successful, the attacker could download and replace the configuration and boot-up file of the IOS, create an account with highest user privileges and take complete control of the switch.

Cisco has confirmed this vulnerability and has released updated software.
 
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
To exploit this vulnerability, the attacker would need the ability to submit Smart Install packets to the targeted system. To achieve this objective, the attacker may need access to trusted, internal network resources. This access requirement reduces the exposure of this vulnerability.

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 CSCub55790 at the following link: cisco-sa-20130327-smartinstall
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to completely take over a switch and launch further attacks.
 
Technical Information
The vulnerability exists in the Smart Install Client as it fails to perform sufficient validation of user-supplied packets.

An unauthenticated, remote attacker could exploit the vulnerability by transmitting a crafted packet to the SMI IBC server to instruct it to download a crafted IOS config file and IOS image file via TCP session to port 4786.

Successful exploitation could allow the attacker to grant access to a user account with elevated privileges as specified in the config file. The attacker could use this access to cause a complete compromise of the affected device.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

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

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 Smart Install Denial of Service Vulnerability

Administrators may consider disabling the Smart Install feature.

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.
 
Alert History
 
Version 1, March 27, 2013, 4:25 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:
N/A

Associated Products:
CiscoIOS 12.2EX 12.2(55)EX, 12.2(55)EX1, 12.2(55)EX2, 12.2(55)EX3, 12.2(58)EX | 12.2EY 12.2(55)EY | 12.2EZ 12.2(55)EZ | 12.2SE 12.2(55)SE, 12.2(55)SE1, 12.2(55)SE2, 12.2(55)SE3, 12.2(55)SE4, 12.2(55)SE5, 12.2(55)SE6, 12.2(58)SE, 12.2(58)SE1, 12.2(58)SE2 | 15.0SE 15.0(1)SE, 15.0(1)SE1, 15.0(1)SE2, 15.0(1)SE3, 15.0(2)SE | 15.1GC 15.1(4)GC | 15.1SY 15.1(1)SY | 15.2GC 15.2(1)GC, 15.2(1)GC1, 15.2(1)GC2, 15.2(2)GC, 15.2(3)GC | 15.2GCA 15.2(3)GCA | 15.2XA 15.2(3)XA




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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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