Cisco Nexus 1000V contains an issue that could allow an unauthenticated, remote attacker to inject traffic or eavesdrop on communications between a Virtual Supervisor Module and a Virtual Ethernet Module. Updates are not available.
Cryptographic issues in the Cisco Nexus 1000v could allow an unauthenticated, remote attacker to to inject traffic or eavesdrop on the communications between a Virtual Supervisor Module (VSM) and a Virtual Ethernet Module (VEM).
The issues are due to errors in the implementation of the cryptography employed for VSM to VEM communications. An attacker must have access to the Layer 2 management VLAN or the Layer 3 management traffic to exploit these issues.
Cisco would like to thank Felix 'FX' Lindner, Recurity Labs GmbH, for reporting this issue to us.
Cisco has confirmed the issue 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 is affected. Later releases of Cisco NX-OS Software for Nexus 1000 Series may also be affected.
To exploit this issue, the attacker would likely need access to a trusted, internal network in which the targeted device may reside. This access restriction 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 issue to inject traffic or eavesdrop on communications between a VSM and a VEM. Successful exploitation could result in information disclosure, or allow an attacker to inject arbitrary traffic that could be leveraged to conduct further attacks.
The issue is due to unspecified errors in the implementation of the cryptography employed for VSM to VEM communications by the affected software.
An unauthenticated, remote attacker with access to the Layer 2 management VLAN or the Layer 3 management traffic could exploit this issue to inject traffic or eavesdrop on the communications between a VSM and a VEM. Successful exploitation could be leveraged to conduct further attacks.
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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