Cisco Security Advisory
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Internet Group Management Protocol version 3 (IGMPv3) input packet processing of Cisco NX-OS could allow an unauthenticated, adjacent attacker to cause the IGMP process to restart due to a malformed IGMP packet, which could cause a denial of service (DoS) condition on the device.
The vulnerability is due to improper input validation when ensuring the memory allocated is large enough for the number of included sources in the IGMPv3 packet. An attacker could exploit this vulnerability by sending a crafted IGMPv3 packet to the targeted device. An exploit could allow the attacker to cause the IGMP process to restart due to a buffer overflow, which may cause a DoS condition.
Cisco has confirmed the vulnerability. Software updates are available.
An unauthenticated, adjacent attacker could use this vulnerability if the targeted device's IGMPv3 snooping is configured on one or more VLANs and running the affected version of the software.
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the affected device. This access requirement could decrease the likelihood of a successful exploit.
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Cisco has released bug IDs CSCuv69713, CSCuv69717, CSCuv69723, CSCuv69732, and CSCuv48908 for registered users, which contain additional details and up-to-date lists of affected product versions.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to monitor affected systems.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to remove the IGMPv3 snooping configuration.
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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 email at tac@cisco.com.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Aug-17
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