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Vulnerability Alert

Cisco IOS Software Zone-Based Policy Firewall Session Initiation Protocol Inspection Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:28647
Version:1
First Published:2013 March 27 16:09 GMT
Last Published:2013 March 27 16:09 GMT
Port: Not available
CVE:CVE-2013-1145
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.1
 
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
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 improper handling of malicious Session Initiation Protocol (SIP) packets if SIP Application Layer Gateway (ALG) inspection is configured under the Zone-Based Policy Firewall (ZBFW). An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP messages through a targeted device. A successful exploit could allow the attacker to cause a memory leak. A sustained attack could cause the device to reload and result in a DoS condition for legitimate users.
 
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
Inspection of SIP traffic is not enabled by default. If it has been enabled, administrators are advised to review feature requirements and may consider disabling SIP traffic inspection as described in the Safeguards section of this alert if the feature is not needed.

SIP traffic can use UDP port 5060 and TCP ports 5060 and 5061.

Network Address Translation (NAT) of SIP traffic is not affected by this issue.

Cisco indicates through the CVSS score that proof-of-concept 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 CSCtl99174 at the following link: cisco-sa-20130327-cce
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a memory leak. A sustained attack could cause the device to reload and result in a DoS condition for legitimate users.
 
Technical Information
The vulnerability is due to improper handling of transiting malicious SIP packets if SIP ALG inspection is configured under the ZBFW.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP messages through a targeted device. When the malicious packets are processed by the device, improper memory operations could result in a memory leak. A successful exploit could allow the attacker to cause the device to reload and result in 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 may consider disabling inspection of SIP traffic if this option is not needed by removing the match protocol sip command from the corresponding class map used by the ZBFW configuration.

Apply hardware rate limiter features to limit packets requiring processing by the device's CPU in order to mitigate denial-of-service (DoS) attacks. See your vendor's documentation for specific configuration instructions. For hardware rate limiting configuration details, consult the Cisco Catalyst 6500 Denial of Service (DoS) Protection Configuration Guide.

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:
N/A

Associated Products:
CiscoIOS 12.4GC 12.4(22)GC1, 12.4(22)GC1a, 12.4(24)GC1, 12.4(24)GC3, 12.4(24)GC3a, 12.4(24)GC4, 12.4(24)GC5 | 12.4MD 12.4(22)MD, 12.4(22)MD1, 12.4(22)MD2, 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 | 12.4MDA 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(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 12.4(24)MDB, 12.4(24)MDB1, 12.4(24)MDB10, 12.4(24)MDB11, 12.4(24)MDB12, 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 | 12.4MDC 12.4(24)MDC | 12.4MR 12.4(20)MR, 12.4(20)MR2 | 12.4MRA 12.4(20)MRA, 12.4(20)MRA1 | 12.4MRB 12.4(20)MRB, 12.4(20)MRB1 | 12.4T 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(22)T, 12.4(22)T1, 12.4(22)T2, 12.4(22)T3, 12.4(22)T4, 12.4(22)T5, 12.4(24)T, 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)T31f, 12.4(24)T32f, 12.4(24)T33f, 12.4(24)T34f, 12.4(24)T35c, 12.4(24)T35f, 12.4(24)T36f, 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)T4g, 12.4(24)T4h, 12.4(24)T4i, 12.4(24)T4j, 12.4(24)T5, 12.4(24)T6, 12.4(24)T7, 12.4(24)T8 | 12.4XR 12.4(22)XR, 12.4(22)XR1, 12.4(22)XR10, 12.4(22)XR11, 12.4(22)XR12, 12.4(22)XR2, 12.4(22)XR3, 12.4(22)XR4, 12.4(22)XR5, 12.4(22)XR6, 12.4(22)XR7, 12.4(22)XR8, 12.4(22)XR9 | 12.4XZ 12.4(15)XZ, 12.4(15)XZ1, 12.4(15)XZ2 | 12.4YA 12.4(20)YA, 12.4(20)YA1, 12.4(20)YA2, 12.4(20)YA3 | 12.4YB 12.4(22)YB, 12.4(22)YB1, 12.4(22)YB4, 12.4(22)YB5, 12.4(22)YB6, 12.4(22)YB7, 12.4(22)YB8 | 12.4YD 12.4(22)YD, 12.4(22)YD1, 12.4(22)YD2, 12.4(22)YD3, 12.4(22)YD4 | 12.4YE 12.4(22)YE, 12.4(22)YE1, 12.4(22)YE2, 12.4(22)YE3, 12.4(22)YE4, 12.4(22)YE5, 12.4(22)YE6, 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, 15.0(1)M6, 15.0(1)M6a, 15.0(1)M7, 15.0(1)M8, 15.0(1)M9 | 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, 15.1(2)GC2, 15.1(4)GC | 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 | 15.1T 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(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 | 15.1XB 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, 15.1(4)XB8a




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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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