Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in Cisco Nexus 1000V switches could allow an unauthenticated, remote attacker to bypass deny statements in access control lists (ACLs) with certain types of Internet Group Management Protocol version 2 (IGMPv2) or IGMP version 3 (IGMPv3) traffic. IGMP version 1 (IGMPv1) is not affected.
The vulnerability is due to a lack of IGMPv2 and IGMPv3 support in ACLs. An attacker could exploit this vulnerability by sending certain IGMPv2 or IGMPv3 requests to an affected switch.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send IGMPv2 or IGMPv3 requests to a targeted device. This access requirement may reduce the possibility 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.
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Customers are advised to consult Cisco bug ID CSCug61691 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Nexus 1000V InterCloud for VMware versions 5.2(1)IC1(1.2) and prior were vulnerable. Later versions may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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 2014-May-06
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