Cisco Nexus 1000V contains a vulnerability that could allow an unauthenticated, remote attacker to conduct man-in-the-middle attacks. Updates are not available.
A vulnerability in the SSL implementation of the Cisco Nexus 1000V could allow an unauthenticated, remote attacker to perform a man-in-the-middle attack against Virtual Supervisor Module (VSM) to VMware vCenter communications.
The vulnerability is due to improper verification of SSL security certificates by the VSM. An attacker could exploit this vulnerability to eavesdrop on communications, and to inject modified or arbitrary data.
Cisco would like to thank Felix 'FX' Lindner, Recurity Labs GmbH, for reporting this issue to us.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
At the time this alert was first published, Cisco NX-OS Software for Nexus 1000 Series 4.2(1)SV1(5.1) and prior are vulnerable. Later releases of Cisco NX-OS Software for Nexus 1000 Series may also be affected.
To exploit this vulnerability, the attacker would likely need access to a trusted, internal network in which the targeted device may reside and have access to the communication path between the VSM and vCenter server. These access restrictions limits the possibility of a successful exploit.
Customers are advised to review the bug reports in the "Vendor Announcements" section for a current list of affected versions.
An unauthenticated, remote attacker could exploit this vulnerability to gain unauthorized access to communications between a VSM to VMware vCenter on an affected device. Successful exploitation could allow an attacker to eavesdrop on sensitive information or allow the attacker to inject arbitrary data in the communication path, which could be leveraged to conduct further attacks.
The vulnerability is due to improper verification of SSL security certificates by the VSM on affected Cisco Nexus 1000V devices.
An unauthenticated, remote attacker could exploit this vulnerability to perform man-in-the-middle attacks. Successful exploitation could be leveraged to conduct further attacks, such as injecting modified or arbitrary data or gaining access to sensitive information.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
The security vulnerability applies to the following combinations of products.
Cisco NX-OS Software
for Nexus 1000 Series 4.2(1)SV1(5.1)
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