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[R5] Nessus 5.0 Fixes Third-party Library Vulnerability

Medium
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Synopsis

Tenable's Nessus scanner is affected by a vulnerability in the bundled version of the OpenSSL library. The issue is triggered when a malicious client requests multiple SSL/TLS renegotations, and will result in a temporary loss of availability for the web service.

Solution

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

Tenable has released Nessus version 5.0 that corresponds to the supported operating systems and architectures. This version bundles an updated OpenSSL library which is not affected.

To update your Nessus installation, follow these steps:

  1. Download the appropriate installation file to the system hosting Nessus or Nessus Enterprise, available at the Tenable Support Portal (https://support.tenable.com/support-center/index.php?x=&mod_id=200)
  2. Stop the Nessus service.
  3. Install according to your operating system procedures.
  4. Restart the Nessus service.

In addition, Tenable has authored a Nessus Plugin (ID 53491, ssl_renegotiation_dos.nasl) that detects this TLS/SSL vulnerability.

Additional References

http://www.ietf.org/mail-archive/web/tls/current/msg07553.html
http://thehackerschoice.wordpress.com/2011/10/24/thc-ssl-dos/

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]

Risk Information

CVE ID: CVE-2011-1473
Tenable Advisory ID: TNS-2011-01
Risk Factor: Medium
Credit:
Lenny Hansson (reported to Tenable)
CVSSv2 Base / Temporal Score
5.0 / 4.1
CVSSv2 Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C)
Additional Keywords:
THC-SSL-DOS

Affected Products

Nessus: 4.4.1

Disclosure Timeline

2011-03-16 - Disclosure
2011-10-25 - Vendor Informed
2011-10-25 - Vendor Acknowledge

Advisory Timeline

2014-07-10 - [R1] Initial release
2014-07-15 - [R2] Disclosure timeline, edits for style
2014-07-23 - [R3] Convert to CVSS w/ Temporal
2016-11-17 - [R4] Adjusted CVSSv2 score
2017-03-01 - [R5] Title standardization, adjust CVSS for worst-case scenario (AV:A -> AV:N)
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