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Vulnerability Alert

Cisco IOS Software Network Address Translation Session Initiation Protocol Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25362
Version:1
First Published:2012 March 28 16:36 GMT
Last Published:2012 March 28 16:36 GMT
Port: 5060
CVE:CVE-2012-0383
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 system.  Updates are available.

 
 
Description

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to improper boundary checking and translation of Session Initiation Protocol (SIP) packets by the affected software when it is configured to use network address translation (NAT).  An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets to the affected system. If successful, the attacker could cause the vulnerable device to become unresponsive or could cause it to reload, resulting in a DoS condition.

Cisco has confirmed this vulnerability in a security advisory and 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

It is likely that an attacker would need to have access to an internal, private network to send crafted SIP requests. This requirement may limit the possibility of a potential attack.

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 CSCti35326 at the following link: cisco-sa-20120328-nat

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to become unresponsive due to incrementing use of memory that will not be released until the device is reloaded, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to improper boundary checking and translation of SIP packets by the affected software when it is configured to use NAT.  The processing of transit SIP packets via UDP port 5060 could cause a memory resource exhaustion condition that can lead to a DoS condition.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets to the affected system. If successful, the attacker could cause the vulnerable device to become unresponsive or could cause it to reload, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only privileged users to access administration or management systems.

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.

Administrators are advised to disable the NAT translation of SIP packets feature if this option is not needed with the following command: no ip nat service udp port 5060.

Administrators are advised to monitor critical 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
 

Initial Release



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

Primary Products:
CiscoIOS 12.4GC Base, 12.4(22)GC1, 12.4(22)GC1a, 12.4(24)GC1, 12.4(24)GC2, 12.4(24)GC3, 12.4(24)GC3a, 12.4(24)GC4 | 12.4MD Base, 12.4(11)MD, 12.4(11)MD1, 12.4(11)MD10, 12.4(11)MD11, 12.4(11)MD2, 12.4(11)MD3, 12.4(11)MD4, 12.4(11)MD5, 12.4(11)MD6, 12.4(11)MD7, 12.4(11)MD8, 12.4(11)MD9, 12.4(15)MD, 12.4(15)MD1, 12.4(15)MD2, 12.4(15)MD3, 12.4(15)MD4, 12.4(15)MD5, 12.4(15)MD6, 12.4(22)MD, 12.4(22)MD1, 12.4(22)MD2, 12.4(22)MD3, 12.4(24)MD, 12.4(24)MD1, 12.4(24)MD2, 12.4(24)MD3, 12.4(24)MD4, 12.4(24)MD5, 12.4(24)MD6, 12.4(24)MD7, 12.4(111)MD, 12.4(115)MD, 12.4(122)MD | 12.4MDA Base, 12.4(22)MDA, 12.4(22)MDA1, 12.4(22)MDA2, 12.4(22)MDA3, 12.4(22)MDA4, 12.4(22)MDA5, 12.4(22)MDA6, 12.4(22)MDA7, 12.4(24)MDA, 12.4(24)MDA1, 12.4(24)MDA10, 12.4(24)MDA11, 12.4(24)MDA12, 12.4(24)MDA2, 12.4(24)MDA3, 12.4(24)MDA4, 12.4(24)MDA5, 12.4(24)MDA6, 12.4(24)MDA7, 12.4(24)MDA8, 12.4(24)MDA9 | 12.4MDB Base, 12.4(24)MDB, 12.4(24)MDB1, 12.4(24)MDB2, 12.4(24)MDB3, 12.4(24)MDB4, 12.4(24)MDB5, 12.4(24)MDB5a, 12.4(24)MDB5b, 12.4(24)MDB6, 12.4(24)MDB7 | 12.4T Base, 12.4(2)T, 12.4(2)T1, 12.4(2)T2, 12.4(2)T3, 12.4(2)T4, 12.4(2)T5, 12.4(2)T6, 12.4(4)T, 12.4(4)T1, 12.4(4)T2, 12.4(4)T3, 12.4(4)T4, 12.4(4)T5, 12.4(4)T6, 12.4(4)T7, 12.4(4)T8, 12.4(6)T, 12.4(6)T1, 12.4(6)T10, 12.4(6)T11, 12.4(6)T12, 12.4(6)T2, 12.4(6)T3, 12.4(6)T4, 12.4(6)T5, 12.4(6)T5a, 12.4(6)T5b, 12.4(6)T5c, 12.4(6)T5d, 12.4(6)T5e, 12.4(6)T5f, 12.4(6)T6, 12.4(6)T7, 12.4(6)T8, 12.4(6)T9, 12.4(9)T, 12.4(9)T0a, 12.4(9)T1, 12.4(9)T2, 12.4(9)T3, 12.4(9)T4, 12.4(9)T5, 12.4(9)T6, 12.4(9)T7, 12.4(11)T, 12.4(11)T1, 12.4(11)T2, 12.4(11)T3, 12.4(11)T4, 12.4(15)T, 12.4(15)T1, 12.4(15)T10, 12.4(15)T11, 12.4(15)T12, 12.4(15)T13, 12.4(15)T13b, 12.4(15)T14, 12.4(15)T15, 12.4(15)T16, 12.4(15)T17, 12.4(15)T2, 12.4(15)T3, 12.4(15)T4, 12.4(15)T5, 12.4(15)T6, 12.4(15)T6a, 12.4(15)T7, 12.4(15)T8, 12.4(15)T9, 12.4(20)T, 12.4(20)T1, 12.4(20)T2, 12.4(20)T3, 12.4(20)T4, 12.4(20)T5, 12.4(20)T5a, 12.4(20)T6, 12.4(20)T6a, 12.4(20)T7, 12.4(20)T8, 12.4(20)T9, 12.4(22)T, 12.4(22)T1, 12.4(22)T2, 12.4(22)T3, 12.4(22)T4, 12.4(22)T5, 12.4(22)T6, 12.4(24)T, 12.4(24)T1, 12.4(24)T3(4), 12.4(24)T2, 12.4(24)T3(c5), 12.4(24)T3, 12.4(24)T3a, 12.4(24)T3b, 12.4(24)T3c, 12.4(24)T3e, 12.4(24)T3f, 12.4(24)T31f, 12.4(24)T3g, 12.4(24)T34(d1), 12.4(24)T34d, 12.4(24)T35c, 12.4(24)T4, 12.4(24)T4a, 12.4(24)T4b, 12.4(24)T4c, 12.4(24)T4d, 12.4(24)T4e, 12.4(24)T5, 12.4(24)T6, 12.4(24)T7, 12.4(24)T8, 12.4(24)T9, 12.4(100)T, 12.4(102)T, 12.4(104)T, 12.4(106)T, 12.4(106)T5, 12.4(106)T5a, 12.4(109)T, 12.4(111)T, 12.4(115)T, 12.4(120)T, 12.4(122)T | 15.0M Base, 15.0(1)M, 15.0(1)M1, 15.0(1)M10, 15.0(1)M11, 15.0(1)M2, 15.0(1)M3, 15.0(1)M4, 15.0(1)M5, 15.0(1)M5a, 15.0(1)M6, 15.0(1)M6a, 15.0(1)M7, 15.0(1)M8, 15.0(1)M9 | 15.1T Base, 15.1(1)T, 15.1(1)T1, 15.1(1)T2, 15.1(1)T3, 15.1(1)T4, 15.1(1)T5, 15.1(2)T, 15.1(2)T0a, 15.1(2)T1, 15.1(2)T10, 15.1(2)T2, 15.1(2)T2a, 15.1(2)T3, 15.1(2)T4, 15.1(2)T5, 15.1(3)T, 15.1(3)T1, 15.1(3)T2, 15.1(3)T3, 15.1(3)T4, 15.1(4)T, 15.1(100)T | 15.1XB Base, 15.1(1)XB, 15.1(1)XB1, 15.1(1)XB2, 15.1(1)XB3, 15.1(4)XB4, 15.1(4)XB5, 15.1(4)XB5a, 15.1(4)XB6, 15.1(4)XB7

Associated Products:
CiscoIOS 12.4GC | 12.4MD | 12.4MDA | 12.4MDB | 12.4T | 15.0M | 15.1T | 15.1XB




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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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