Cisco NX-OS contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
Cisco NX-OS contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.
The vulnerability is due to improper processing of certain packets by the affected devices. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to the targeted device. Successful exploitation could allow the attacker to cause a DoS condition on the targeted device.
Cisco has confirmed this vulnerability and has released updated software.
Cisco NX-OS versions 5.0 and 5.1 running on Cisco Nexus 2000 Series and Cisco Nexus 5000 Series switches are vulnerable.
In typical network configuration, the vulnerable devices are behind a firewall. To exploit this vulnerability, an attacker must have access to the internal network to send crafted packets to the vulnerable devices. This access requirement could limit the likelihood of a successful exploit.
An unauthenticated, remote attacker could exploit this vulnerability to reload the targeted device, resulting in a DoS condition.
The vulnerability is due to improper processing of certain Internet Group Management Protocol (IGMP) packets by the igmp_snoop_orib_fill_source_update() function.
An unauthenticated, remote attacker could exploit this vulnerability by sending crafted IGMP packets to the targeted devices. Processing such packets could cause the attacker to remotely reload the device, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
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.
The security vulnerability applies to the following combinations of products.
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
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.