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Vulnerability Alert

Cisco IOS Software NAT SIP ALG Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:26896
Version:1
First Published:2012 September 26 16:23 GMT
Last Published:2012 September 26 16:23 GMT
Port: 5060
CVE:CVE-2012-4618
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security AdvisoryView related BlogView related Event Response
 
 
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 processing of Session Initiation Protocol (SIP) packets in transit while NAT is performed on a targeted device. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets via UDP port 5060 to a device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a DoS condition.

Cisco confirmed this vulnerability and software updates are available.
 
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
The NAT SIP ALG is enabled by default in Cisco IOS images that include the NAT SIP ALG feature. Administrators are advised to disable this feature as described in the Safeguards section of this alert if the feature is not needed.

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 CSCtn76183 at the following link: cisco-sa-20120926-nat
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reload, resulting in a DoS condition. Repeated exploitation could result in a sustained DoS condition.
 
Technical Information
The vulnerability is due to improper processing of SIP packets in transit while performing NAT. The NAT SIP application layer gateway (ALG) feature must be enabled to trigger this vulnerability.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets via UDP port 5060 to a targeted device that is performing NAT for SIP packets. When processed, the packets could cause the device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate software updates.

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 may consider disabling the NAT SIP ALG feature if this option is not needed by issuing the no ip nat service sip udp port 5060 global configuration command.

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 12.2SXH 12.2(33)SXH7w, 12.2(33)SXH8, 12.2(33)SXH8a, 12.2(33)SXH8b | 12.2SXI 12.2(33)SXI5, 12.2(33)SXI5a, 12.2(33)SXI6 | 12.2SXJ 12.2(33)SXJ | 12.2SY 12.2(50)SY, 12.2(50)SY1, 12.2(50)SY2 | 12.4 12.4(23a), 12.4(23b), 12.4(23c), 12.4(23d), 12.4(23e), 12.4(25), 12.4(25a), 12.4(25b), 12.4(25c), 12.4(25d), 12.4(25e), 12.4(25f) | 12.4GC 12.4(24)GC1, 12.4(24)GC3, 12.4(24)GC3a, 12.4(24)GC4 | 12.4M 12.4(23b)M1 | 12.4MD 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 | 12.4MDA 12.4(24)MDA1, 12.4(24)MDA10, 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 12.4(24)MDB1, 12.4(24)MDB3, 12.4(24)MDB4, 12.4(24)MDB5, 12.4(24)MDB5a, 12.4(24)MDB6, 12.4(24)MDB7, 12.4(24)MDB8, 12.4(24)MDB9 | 12.4T 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(24)T1, 12.4(24)T2, 12.4(24)T3, 12.4(24)T3c, 12.4(24)T3e, 12.4(24)T3f, 12.4(24)T3g, 12.4(24)T32f, 12.4(24)T31f, 12.4(24)T33f, 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)T4f, 12.4(24)T5, 12.4(24)T6 | 12.4YE 12.4(24)YE, 12.4(24)YE1, 12.4(24)YE2, 12.4(24)YE3, 12.4(24)YE3a, 12.4(24)YE3b, 12.4(24)YE3c, 12.4(24)YE3d, 12.4(24)YE4, 12.4(24)YE5, 12.4(24)YE6, 12.4(24)YE7 | 12.4YG 12.4(24)YG1, 12.4(24)YG2, 12.4(24)YG3, 12.4(24)YG4 | 15.0M 15.0(1)M, 15.0(1)M1, 15.0(1)M2, 15.0(1)M3, 15.0(1)M4, 15.0(1)M5 | 15.0XA 15.0(1)XA, 15.0(1)XA1, 15.0(1)XA2, 15.0(1)XA3, 15.0(1)XA4, 15.0(1)XA5 | 15.1GC 15.1(2)GC, 15.1(2)GC1 | 15.1M 15.1(4)M, 15.1(4)M0a, 15.1(4)M0b | 15.1T 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)T2, 15.1(2)T2a, 15.1(2)T3, 15.1(3)T, 15.1(3)T1 | 15.1XB 15.1(1)XB, 15.1(1)XB1, 15.1(1)XB2, 15.1(1)XB3, 15.1(4)XB4

Associated Products:
N/A




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