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Security Intelligence Operations
Cisco IOS IPC Message Denial of Service Vulnerability |
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| Vulnerability Alert | Powered by  |
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| Threat Type: | Unintended Weakness: Denial of Service |
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| IntelliShield ID: | 16646 |
| Version: | 1 |
| First Published: | September 24, 2008 01:04 PM EDT |
| Last Published: | September 24, 2008 01:04 PM EDT |
| Vector: | Network |
| Authentication: | None |
| Exploit: | Functional |
| Port: | 1975 |
| CVE: | CVE-2008-3805
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CVE-2008-3806 |
| BugTraq ID: | 31363 |
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| Urgency: |
Unlikely Use
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| Credibility: |
Confirmed
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| Severity: |
Mild Damage
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| CVSS Base: | 8.5 |
CVSS Calculator
CVSS Version 2
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| CVSS Temporal: | 7.0 |
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| 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. |
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| Description |
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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. |
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| Warning Indicators |
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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 |
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| IntelliShield Analysis |
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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. |
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| Vendor Announcements |
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Cisco has released a security advisory for Cisco Bug IDs CSCsg15342 and CSCsh29217 at the following link: cisco-sa-20080924-ipc |
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| Impact |
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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. |
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| Technical Information |
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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. |
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| Safeguards |
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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 |
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| Patches/Software |
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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. |
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| Alert History |
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Initial Release |
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Product Sets |
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The security vulnerability applies to the following combinations of products.
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LEGAL DISCLAIMER
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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