Cisco Intrusion Prevention System Network Module Enhanced contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
A vulnerability in the memory allocation code could allow an unauthenticated, remote attacker to cause a reload of the affected system. The vulnerability is due to improper handling of memory allocation when malformed IP packets are received on the management interface of the affected system. An attacker may exploit this vulnerability by sending malformed IP packets to the management IP address.
The vulnerability can be triggered only by IPv4 traffic directed to the management interface. Traffic passing through the sensing interfaces will not trigger this vulnerability.
Cisco has confirmed the vulnerability in a security advisory and has released software updates.
Cisco IPS NME versions prior to 7.0(9)E4 are affected.
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Prevent disruption of communication between devices by reducing the impact of attacks which may directly impact the CPU performance of the individual devices. For control plane hardening best practices, see the Cisco Guide to Harden Cisco IOS Devices.
Understanding activity on the network provides information and visibility that can be used to identify potential security incidents. Organizations should log events from devices and review the logged data to provide insight into anomalies or malicious activity. For logging best practices, see the Cisco Guide to Harden Cisco IOS Devices.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center. 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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