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[R2] Tenable Nessus Web UI /feed Method Remote Version Disclosure

Info

Synopsis

Nessus contains a flaw in the Web Server that may lead to an unauthorized information disclosure. The issue is triggered when a remote attacker makes a request for the /feed method, which discloses the software's version resulting in a loss of confidentiality. While such information is relatively low risk, it is often useful in carrying out additional, more focused attacks.

* Please note that according to the CVSSv2 guidelines, a partial confidentiality disclosure consists of "considerable informational disclosure. Access to some system files is possible, but the attacker does not have control over what is obtained, or the scope of the loss is constrained. An example is a vulnerability that divulges only certain tables in a database". By this definition, Tenable does not agree that this issue warrants a 'partial confidentiality' rating. As such, we are rating this as 'none' which puts the CVSSv2 score at 0.0. Unfortunately, this is a limitation of CVSS in scoring as there is no way to abstract between a very minor information disclosure (e.g. server banner, path disclosure) versus something more serious. We recognize that this issue may pose a small risk in some environments. Finally, as always, Tenable recommends that Nessus web server interfaces not be exposed to external networks unless absolutely required.

Solution

Tenable has Nessus to address this issue. Please see the instructions below:

Tenable has released version 1.2.6 of the Web GUI for all supported operating systems and architectures. This version adds support for the xmlrpc_hide_version option which allows administrators to suppress the version in the /feed method.

By default, Nessus updates the plugins once every day. Users do not need to do anything to receive the update.

This page contains information regarding security vulnerabilities that may impact Tenable's products. This may include issues specific to our software, or due to the use of third-party libraries within our software. Tenable strongly encourages users to ensure that they upgrade or apply relevant patches in a timely manner.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]