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Vulnerability Alert

Cisco IOS Software SIP Message Handling Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:20063
Version:1
First Published:2010 March 24 16:01 GMT
Last Published:2010 March 24 16:01 GMT
Port: 5060, 5061
CVE:CVE-2010-0579
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.  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.

The vulnerability is due to errors in processing malformed Session Initiation Protocol (SIP) messages.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request to the targeted device.  Successful exploitation could allow the attacker to cause a DoS condition.

Cisco confirmed the 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

To exploit the vulnerability, an attacker must be able to send a malicious SIP message to a device.  Systems that serve voice traffic may be located on separate physical or logical networks, making exploitation more difficult.  An exploit could allow the attacker to cause the targeted device to fail and reload, potentially interrupting network services.

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 CSCtb93416 at the following link: cisco-sa-20100324-sip

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause the device to fail and reload, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to errors in processing malformed SIP messages.  Affected devices accept SIP messages via TCP and UDP ports 5060 or TCP port 5061.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious SIP message to the targeted device.  When processed, the message could cause the device to stop responding and reload, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the available software updates.

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

Administrators may consider disabling SIP listening ports on devices that are not required to process voice network traffic.

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 monitor critical systems.

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: cisco-amb-20100324-voice
 
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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
24600/0Cisco IOS SIP DoSS5932011 Sep 07 
 
Alert History
 

Initial Release



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

Primary Products:
N/A

Associated Products:
CiscoIOS 12.3T 12.3(7)T10, 12.3(7)T11, 12.3(7)T2, 12.3(7)T3, 12.3(7)T4, 12.3(7)T5, 12.3(7)T7, 12.3(8)T10, 12.3(8)T2, 12.3(8)T3, 12.3(8)T4, 12.3(8)T6, 12.3(8)T7, 12.3(8)T8, 12.3(8)T9, 12.3(11)T2a, 12.3(11)T3, 12.3(11)T5, 12.3(11)T6, 12.3(11)T8, 12.3(14)T2, 12.3(14)T3, 12.3(14)T4, 12.3(14)T5 | 12.3XD 12.3(4)XD1, 12.3(4)XD4 | 12.3XG 12.3(4)XG1, 12.3(4)XG2, 12.3(4)XG3, 12.3(4)XG4 | 12.3XH 12.3(4)XH1 | 12.3XI 12.3(7)XI1, 12.3(7)XI10a, 12.3(7)XI2b, 12.3(7)XI4, 12.3(7)XI7, 12.3(7)XI7a, 12.3(7)XI7b, 12.3(7)XI8bc, 12.3(7)XI8g | 12.3XJ 12.3(7)XJ1, 12.3(7)XJ2 | 12.3XK 12.3(4)XK1, 12.3(4)XK3 | 12.3XQ 12.3(4)XQ1 | 12.3XR 12.3(7)XR3, 12.3(7)XR4, 12.3(7)XR5 | 12.3XU 12.3(8)XU2, 12.3(8)XU5 | 12.3XW 12.3(8)XW1, 12.3(8)XW2, 12.3(8)XW3 | 12.3XX 12.3(8)XX1, 12.3(8)XX2d | 12.3XY 12.3(8)XY1, 12.3(8)XY3, 12.3(8)XY4, 12.3(8)XY5, 12.3(8)XY7 | 12.3YB 12.3(7)YB1 | 12.3YC 12.3(8)YC2, 12.3(8)YC3 | 12.3YF 12.3(11)YF2 | 12.3YK 12.3(11)YK1, 12.3(11)YK2 | 12.3YM 12.3(14)YM1, 12.3(14)YM11, 12.3(14)YM12, 12.3(14)YM3, 12.3(14)YM4, 12.3(14)YM6, 12.3(14)YM7, 12.3(14)YM9 | 12.3YQ 12.3(14)YQ4, 12.3(14)YQ5, 12.3(14)YQ7 | 12.3YR 12.3(11)YR1 | 12.3YS 12.3(11)YS2 | 12.3YT 12.3(14)YT1 | 12.3YU 12.3(14)YU1 | 12.3YW 12.3(11)YW2 | 12.3YX 12.3(14)YX10, 12.3(14)YX11, 12.3(14)YX15, 12.3(14)YX7, 12.3(14)YX8 | 12.3ZA 12.3(8)ZA1 | 12.4 12.4(3h), 12.4(3i), 12.4(3j), 12.4(7h), 12.4(10c), 12.4(13d), 12.4(13e), 12.4(16), 12.4(16a), 12.4(16b), 12.4(18b), 12.4(18d), 12.4(18e), 12.4(19), 12.4(19a), 12.4(19b), 12.4(21), 12.4(23), 12.4(23a), 12.4(23b), 12.4(25), 12.4(25a), 12.4(25b) | 12.4M 12.4(21a)M1 | 12.4MR 12.4(4)MR1 | 12.4T 12.4(2)T3, 12.4(2)T4, 12.4(4)T6, 12.4(4)T8, 12.4(6)T10, 12.4(6)T11, 12.4(6)T12, 12.4(6)T4, 12.4(6)T5, 12.4(6)T5b, 12.4(6)T7, 12.4(6)T8, 12.4(6)T9 | 12.4XA 12.4(2)XA1 | 12.4XB 12.4(2)XB1, 12.4(2)XB11, 12.4(2)XB3, 12.4(2)XB6, 12.4(2)XB7, 12.4(2)XB8, 12.4(2)XB9 | 12.4XD 12.4(4)XD1, 12.4(4)XD10, 12.4(4)XD11, 12.4(4)XD12, 12.4(4)XD2, 12.4(4)XD4, 12.4(4)XD5, 12.4(4)XD6, 12.4(4)XD8




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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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