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Vulnerability Alert

Cisco IOS Software DHCP Server remember Functionality Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31156
Version:1
First Published:2013 October 09 18:42 GMT
Last Published:2013 October 09 18:42 GMT
Port: Not available
CVE:CVE-2013-5499
BugTraq ID:62866
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.7 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.7
 
 
Version Summary:Cisco IOS Software contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available.
 
 
Description
An issue in the DHCP server code of Cisco IOS Software could allow an unauthenticated, adjacent attacker to cause the device to reload.

The issue is due to the remember functionality of the DHCP server. An attacker could exploit this issue by obtaining a lease and then releasing it. An exploit could allow the attacker to cause the affected device to reload.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco IOS Software Releases 15.2(3)GCA1 and prior were vulnerable. Later releases of Cisco IOS Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain of a targeted device. This access requirement reduces 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 notice at the following link: CVE-2013-5499

Customers are advised to consult Cisco bug ID CSCuh46822 for a complete list of affected product versions.
 
Impact
An unauthenticated, adjacent attacker could exploit this vulnerability to cause an affected device to reload, resulting in a denial of service (DoS) condition.
 
Technical Information
The issue is due to the remember functionality of the DHCP server used by the affected software.

An unauthenticated, adjacent attacker could exploit this issue by obtaining a lease and then releasing it. A successful exploit could allow the attacker to cause the 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 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:
CiscoIOS 15.1GC 15.1(4)GC, 15.1(4)GC1 | 15.1M 15.1(4)M, 15.1(4)M1, 15.1(4)M2, 15.1(4)M3, 15.1(4)M3a, 15.1(4)M4, 15.1(4)M5, 15.1(4)M6, 15.1(4)M7 | 15.1T 15.1(3)T, 15.1(3)T1, 15.1(3)T2, 15.1(3)T3, 15.1(3)T4 | 15.1XB 15.1(4)XB4, 15.1(4)XB5, 15.1(4)XB5a, 15.1(4)XB6, 15.1(4)XB7, 15.1(4)XB8, 15.1(4)XB8a | 15.2GC 15.2(1)GC, 15.2(1)GC1, 15.2(1)GC2, 15.2(2)GC, 15.2(3)GC, 15.2(3)GC1, 15.2(4)GC | 15.2GCA 15.2(3)GCA, 15.2(3)GCA1

Associated Products:
N/A



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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