Vulnerability Alert

Cisco IOS Software Zone-Based Firewall Crafted IP Packets Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25368
Version:1
First Published:2012 March 28 16:35 GMT
Last Published:2012 March 28 16:35 GMT
Port: Not available
CVE:CVE-2012-1310
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 the improper processing of crafted IP packets by the affected software when it is configured with the zone-based firewall feature.  An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted IP packets to a vulnerable device.  If successful, the attacker could cause the device to reload, resulting in a DoS condition.

Cisco has 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

A successful exploit could allow an attacker to cause the vulnerable device to reload or stop responding, potentially preventing authorized users from accessing network resources served by the targeted device.

It is likely that the vulnerable device is behind a firewall that is between a public and private network. As a result, an attacker would need to have access to an internal network to send crafted IP packets to a vulnerable device.  This requirement could limit the possibility for an attack.

This alert contains CVSS scoring supplied by Cisco, the primary vendor of the affected product.  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  CSCto89536 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 IP packets by the affected software when it is configured with the zone-based firewall feature. The vulnerability can be triggered only by traffic destined to an IP address configured on the device; traffic in transit through the vulnerable device is not an exploit vector.

An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted IP packets to 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.  Repeated attacks could result in a sustained DoS condition on the affected device.

 
Safeguards

Administrators are advised to apply the appropriate 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 using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

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 15.0M | 15.0XA | 15.1GC | 15.1M | 15.1T | 15.1XB | 15.2GC | 15.2T




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