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[R2] Nessus Agent 8.2.0 Fixes One Vulnerability

Medium
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Synopsis

A vulnerability in Nessus Agent 8.0.0 and 8.1.0 for Windows could allow an authenticated local attacker to execute arbitrary code by copying user-supplied files to a specially constructed path in a specifically named user directory. The attacker needs valid credentials on the Windows system to exploit this vulnerability.

Solution

Tenable has included a fix in Nessus Agent 8.2.0 and Nessus Agent 8.1.1 to address this issue. The installation files can be obtained from the Tenable Downloads Portal (https://www.tenable.com/downloads/nessus-agents).

*Note: Windows Dependency Update

Nessus Agent 8.2.0 and later require Windows host systems to be running the Universal Microsoft C Runtime Library (UCRT) (for more information, see Microsoft Documentation). This means that some older versions of Microsoft Windows will require a minimum update to work with Nessus Agent 8.2.0 and later. While it is recommended to upgrade to the latest version of Nessus Agent 8.2.0, Tenable will release Nessus Agent 8.1.1 in early November to accommodate vulnerability fixes while maintaining the same standard library in cases where Nessus Agent 8.2.0 direct upgrade is not possible.

Additional References

https://docs.tenable.com/releasenotes/Content/nessusagent/agent820.htm
https://docs.tenable.com/releasenotes/Content/nessusagent/agent811.htm
https://docs.tenable.com/nessusagent/8_2/Content/GettingStarted.htm

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-2020-5793
Tenable Advisory ID: TNS-2020-07
Risk Factor: Medium
Credit:
Marius Gabriel Mihai
CVSSv2 Base / Temporal Score
6.8 / 5.3
CVSSv2 Vector:
AV:L/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:OF/RC:C

Affected Products

Nessus Agent 8.0.0 and 8.1.0

Disclosure Timeline

2020-10-13 - Issue reported to Tenable
2020-10-19 - Issue validated by Tenable
2020-10-25 - CVE ID requested
2020-10-29 - Nessus Agent 8.2.0 released

Advisory Timeline

2020-10-29 - [R1] Initial Release
2020-11-04 - [R2] Added Release Notes Reference for Nessus Agent 8.1.1
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