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Vulnerability Alert

Cisco IOS IPC Message Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:16646
Version:1
First Published:2008 September 24 17:04 GMT
Last Published:2008 September 24 17:04 GMT
Port: 1975
CVE:CVE-2008-3805 , CVE-2008-3806
BugTraq ID:31363
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:8.5 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.0
Related Resources:
View related Security AdvisoryView related Applied Mitigation Bulletin
 
 
Version Summary:

Cisco IOS software contains a vulnerability when processing IPC messages that could allow an unauthenticated, remote attacker to reload the device, creating a denial of service condition.  Updates are available.

 
 
Description

Cisco IOS software contains a vulnerability that could allow an unauthenticated, remote attacker to reload an affected device, resulting in a denial of service (DoS) condition.

The vulnerability exists due to the manner that affected systems handle Inter-Process Communication (IPC) messages.  Cisco IOS software fails to properly restrict incoming requests from outside the device.  An unauthenticated, remote attacker could exploit the vulnerability by sending a crafted IPC message to reload the device, resulting in a DoS condition.

Cisco has confirmed the vulnerability in a security advisory and released updates.

 
Warning Indicators

The following products are vulnerable:

Cisco IOS 12.0S 
Cisco IOS 12.0SL
Cisco IOS 12.0ST
Cisco IOS 12.2SB
Cisco IOS 12.2SCA 
Cisco IOS 12.2SRC 
Cisco IOS 12.2ZX 
Cisco IOS 12.3BC 
Cisco IOS 12.3T 
Cisco IOS 12.3XI 
Cisco IOS 12.4 

 
IntelliShield Analysis

The vulnerability only affects Cisco 10000, uBR10012, and uBR7200 series devices, which use a UDP-based IPC channel for communication.  A successful exploit could allow the attacker to reload the affected device.  Repeated attacks may result in a persistent DoS condition.

Cisco indicated through CVSS scoring the existence of functional exploit code; however, this exploit code is not known to be publicly available.

 
Vendor Announcements

Cisco has released a security advisory for Cisco Bug IDs CSCsg15342 and CSCsh29217 at the following link: cisco-sa-20080924-ipc 

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a device to crash and reload, which may result in a temporary DoS condition.  Repeated attacks could render the affected device completely unavailable.

 
Technical Information

The vulnerability exists due insufficient access restrictions on a UDP-based IPC channel that is used by Cisco IOS software for handling IPC messages.  Cisco IOS software improperly processes outside requests when received over UDP port 1975.  An unauthenticated, remote attacker could exploit the vulnerability by sending a crafted IPC message to cause the device to reload, triggering a DoS condition.  Repeated requests may cause a persistent DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to only allow trusted users to access vulnerable systems.

Administrators are advised to implement the Control Plane Policing (CoPP) feature of Cisco IOS software on supported devices.

Administrators are advised to configure filtering rules to drop incoming IPC messages over UDP port 1975 that do not originate from the local device.

Administrators are advised to monitor critical systems for signs of suspicious activity.

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-20080924-ipc-and-ubr

 
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 12.0S 12.0(27)S5, 12.0(27)S5a, 12.0(27)S5b, 12.0(27)S5c, 12.0(27)S5d, 12.0(28)S3, 12.0(28)S4, 12.0(28)S4b, 12.0(28)S4c, 12.0(28)S4d, 12.0(28)S5, 12.0(28)S5a, 12.0(28)S5b, 12.0(28)S5c, 12.0(28)S5d, 12.0(28)S5e, 12.0(28)S6, 12.0(28)S6a, 12.0(28)S6b, 12.0(30)S3, 12.0(30)S3a, 12.0(30)S3b, 12.0(30)S3c, 12.0(30)S3d, 12.0(30)S3s, 12.0(30)S3t, 12.0(30)S4, 12.0(30)S4a, 12.0(30)S4b, 12.0(30)S5, 12.0(30)S5a, 12.0(31)S, 12.0(31)S1, 12.0(31)S1a, 12.0(31)S1b, 12.0(31)S1c, 12.0(31)S1e | 12.0SV 12.0(28)SV | 12.0SW 12.0(30)SW | 12.0SZ 12.0(30)SZ, 12.0(30)SZ1, 12.0(30)SZ2, 12.0(30)SZ3, 12.0(31)SZ2 | 12.2SB 12.2(28)SB, 12.2(28)SB2, 12.2(28)SB3, 12.2(28)SB4, 12.2(28)SB4a, 12.2(28)SB4b, 12.2(28)SB4c, 12.2(28)SB5, 12.2(28)SB5a, 12.2(28)SB5b, 12.2(28)SB6, 12.2(31)SB, 12.2(31)SB1, 12.2(31)SB1a, 12.2(31)SB1b, 12.2(31)SB1c, 12.2(31)SB1d, 12.2(31)SB1e, 12.2(31)SB2, 12.2(31)SB2a | 12.2SBB 12.2(27)SBB, 12.2(27)SBB1, 12.2(27)SBB2, 12.2(27)SBB2a, 12.2(27)SBB3, 12.2(27)SBB4, 12.2(27)SBB4a, 12.2(27)SBB4b, 12.2(27)SBB4c, 12.2(27)SBB4d, 12.2(27)SBB5, 12.2(27)SBB6, 12.2(27)SBB6a, 12.2(27)SBB7, 12.2(27)SBB8 | 12.2UZ 12.2(27)UZ, 12.2(27)UZ1 | 12.2VZ 12.2(28)VZ | 12.2ZV 12.2(28)ZV, 12.2(28)ZV1, 12.2(28)ZV2, 12.2(28a)ZV1, 12.2(28b)ZV1 | 12.2ZX 12.2(28)ZX | 12.3T 12.3(14)T, 12.3(14)T1, 12.3(14)T2 | 12.3XI 12.3(7)XI10, 12.3(7)XI7, 12.3(7)XI7a, 12.3(7)XI7b, 12.3(7)XI8, 12.3(7)XI8a, 12.3(7)XI8bc, 12.3(7)XI8c, 12.3(7)XI8d, 12.3(7)XI8e, 12.3(7)XI8f, 12.3(7)XI8g, 12.3(7)XI9 | 12.3YX 12.3(14)YX5 | 12.4 12.4(1), 12.4(1a), 12.4(1b), 12.4(1c) | 12.4JAM 12.4(25e)JAM1




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