Vulnerability Alert

Cisco Identity Services Engine Guest User Account Exhaustion Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31497
Version:1
First Published:2013 October 25 15:00 GMT
Last Published:2013 October 25 15:00 GMT
Port: Not available
CVE:CVE-2013-5521
BugTraq ID:63337
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
 
Version Summary:Cisco Identity Services Engine contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to exhaust guest user account resources.

The vulnerability is due to a guest account creation page that allows unlimited guest accounts to be created upon refreshing the page. An attacker could exploit this vulnerability by creating a new guest account then repeatedly refreshing the page until the maximum number of guest accounts for the system is reached. An exploit could allow the attacker to deny creation of other guest accounts.

Cisco confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco ISE Software Releases 1.1.4 patch 7 and prior were vulnerable. Later releases of Cisco ISE Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would likely need access to trusted, internal networks and access to the guest account creation page from the targeted device to create new guest accounts. These access requirements 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 released a security notice at the following link: CVE-2013-5521

Customers are advised to consult Cisco bug ID CSCue94287 or the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to deny the creation of new quest accounts, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to the affected software allowing the creation of unlimited guest accounts upon refreshing the page.

An unauthenticated, remote attacker could exploit this vulnerability by creating a new guest account and then repeatedly refreshing the page until the maximum number of guest accounts for the system is reached. An exploit could allow the attacker to deny the creation of other guest accounts.
 
Safeguards
Administrators are advised to monitor affected systems.

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 are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Identity Services Engine Software 1.0 Base, .4.573 | 1.0 MR Base | 1.1 Base, .1 patch 1, .1 patch 2, .1 patch 3, .1 patch 4, .1 patch 5, .1 patch 6, .2 patch 1, .2 patch 2, .2 patch 3, .2 patch 4, .2 patch 5, .2 patch 6, .2 patch 7, .2 patch 8, .2 patch 9, .3 patch 1, .3 patch 2, .3 patch 3, .3 patch 4, .3 patch 5, .3 patch 6, .3 patch 7, .4 patch 1, .4 patch 2, .4 patch 3, .4 patch 4, .4 patch 5, .4 patch 6, .4 patch 7

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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