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Vulnerability Alert

Cisco IOS Software Network Address Translation Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:30703
Version:1
First Published:2013 September 25 16:21 GMT
Last Published:2013 September 25 16:21 GMT
Port: Not available
CVE:CVE-2013-5480
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
A vulnerability exists in Cisco IOS Software that could allow an unauthenticated, remote attacker to reload the vulnerable device.

The vulnerability is due to improper handling of DNS packets that need to be translated across a NAT boundary. An attacker could exploit this vulnerability by sending certain DNS packets. An exploit could allow the attacker to cause an extended DoS condition.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
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, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could 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 has released a security advisory for bug ID CSCuf28733 at the following link: cisco-sa-20130925-nat
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause a targeted device to reload abnormally, resulting in a denial of service (DoS) condition for legitimate users.
 
Technical Information
The vulnerability is due to improper handling of DNS packets that need to be translated across a NAT boundary.

An unauthenticated, remote attacker could exploit this vulnerability by repeatedly sending certain DNS packets to a targeted device. When the malicious packets are processed, an unspecified error could cause the device to reset. A successful exploit could allow the attacker to cause 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 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 email at tac@cisco.com
 
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)M0a, 15.1(4)M0b, 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 | 15.1T 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)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 | 15.2GCA 15.2(3)GCA | 15.2JA 15.2(2)JA, 15.2(2)JA1, 15.2(4)JA | 15.2JAX 15.2(2)JAX | 15.2JB 15.2(2)JB, 15.2(2)JB1 | 15.2M 15.2(4)M, 15.2(4)M1, 15.2(4)M2, 15.2(4)M3 | 15.2T 15.2(1)T, 15.2(1)T1, 15.2(1)T2, 15.2(1)T3, 15.2(1)T3a, 15.2(1)T4, 15.2(2)T, 15.2(2)T1, 15.2(2)T2, 15.2(2)T3, 15.2(3)T, 15.2(3)T1, 15.2(3)T2, 15.2(3)T3 | 15.2XA 15.2(3)XA | 15.2XB 15.2(4)XB10 | 15.3T 15.3(1)T, 15.3(1)T1, 15.3(2)T

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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