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Vulnerability Alert

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

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25372
Version:1
First Published:2012 March 28 16:31 GMT
Last Published:2012 March 28 16:31 GMT
Port: 5060, 5061
CVE:CVE-2012-1315
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 Advisory
 
 
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 on a targeted device.

The vulnerability is due to the improper processing of crafted Session Initiation Protocol (SIP) packets by the affected software when configured with the Zone-Based Firewall feature enabled to inspect SIP packets.  An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP messages through a vulnerable device.  If successful, the attacker could cause the device to reload or trigger memory leaks that may result in system instabilities resulting in 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 send malicious SIP packets to the affected system.? Depending on the configuration of perimeter filtering devices, exploitation may require access to internal networks because external connections using SIP may be restricted.

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 CSCti46171 at the following link: cisco-sa-20120328-zbfw

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reload, resulting in a DoS condition.? Repeated attacks could result in a sustained DoS condition.

 
Technical Information

The vulnerability is due to the improper processing of crafted SIP packets by the affected software when configured with the Zone-Based Firewall feature enabled to inspect SIP packets.  When crafted SIP packets are processed, the packets could cause the system to consume and fail to free memory resources, resulting in a memory leak that may cause system instabilities due to a lack of memory resources.  The vulnerability is exploitable only through transit SIP packets traveling through the vulnerable device.

An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted SIP messages via TCP/UDP port 5060 or TCP port 5061 through a vulnerable device.  If successful, the attacker could cause the device to reload or trigger memory leaks that may result in system instabilities, leading to a DoS condition.  Repeated attacks could result in a sustained DoS condition on the affected device.

 
Safeguards

Administrators are advised to apply the appropriate updates.

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

Administrators may consider configuring the Cisco IOS Software Zone-Based Firewall feature without the SIP inspection option as a mitigation for this vulnerability.

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 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 | 12.4MR 12.4(119)MR, 12.4(119)MR1, Base, 12.4(2)MR, 12.4(2)MR1, 12.4(4)MR, 12.4(4)MR1, 12.4(6)MR, 12.4(6)MR1, 12.4(9)MR, 12.4(11)MR, 12.4(12)MR, 12.4(12)MR1, 12.4(12)MR2, 12.4(16)MR, 12.4(16)MR1, 12.4(16)MR2, 12.4(19)MR, 12.4(19)MR1, 12.4(19)MR2, 12.4(19)MR3, 12.4(20)MR, 12.4(20)MR2 | 12.4MRA Base, 12.4(20)MRA, 12.4(20)MRA1, 12.4(20)MRA2 | 12.4MRB Base, 12.4(20)MRB, 12.4(20)MRB1, 12.4(20)MRB2 | 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 | 12.4XR Base, 12.4(15)XR, 12.4(15)XR1, 12.4(15)XR10, 12.4(15)XR2, 12.4(15)XR3, 12.4(15)XR4, 12.4(15)XR5, 12.4(15)XR6, 12.4(15)XR7, 12.4(15)XR8, 12.4(15)XR9, 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, 12.4(115)XR | 12.4XZ Base, 12.4(15)XZ, 12.4(15)XZ1, 12.4(15)XZ2, 12.4(115)XZ | 12.4YA Base, 12.4(20)YA, 12.4(20)YA1, 12.4(20)YA2, 12.4(20)YA3, 12.4(120)YA | 12.4YB Base, 12.4(22)YB, 12.4(22)YB1, 12.4(22)YB2, 12.4(22)YB3, 12.4(22)YB4, 12.4(22)YB5, 12.4(22)YB6, 12.4(22)YB7, 12.4(22)YB8, 12.4(122)YB | 12.4YD Base, 12.4(22)YD, 12.4(22)YD1, 12.4(22)YD2, 12.4(22)YD3, 12.4(22)YD4, 12.4(100)YD | 12.4YE Base, 12.4(22)YE, 12.4(22)YE1, 12.4(22)YE100, 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 Base, 12.4(24)YG1, 12.4(24)YG2, 12.4(24)YG3, 12.4(24)YG4 | 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 | 15.0XA Base, 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 Base, 15.1(2)GC, 15.1(2)GC1, 15.1(2)GC2 | 15.1M Base, 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, 15.1(4)M7 | 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 | 15.2GC 15.2(1)GC, Base, 15.2(1)GC1, 15.2(1)GC2 | 15.2T Base, 15.2(1)T, 15.2(1)T1, 15.2(1)T2, 15.2(1)T3, 15.2(1)T4, 15.2(2)T, 15.2(2)T1, 15.2(2)T2, 15.2(2)T3, 15.2(2)T4, 15.2(3)T, 15.2(3)T1, 15.2(3)T2, 15.2(3)T3, 15.2(3)T4

Associated Products:
CiscoIOS 12.4GC | 12.4MD | 12.4MDA | 12.4MDB | 12.4MR | 12.4MRA | 12.4MRB | 12.4T | 12.4XR | 12.4XZ | 12.4YA | 12.4YB | 12.4YD | 12.4YE | 12.4YG | 15.0M | 15.0XA | 15.1GC | 15.1T | 15.1XB




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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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