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.
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.
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.
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
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 firstname.lastname@example.org.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.