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AUSCERT External Security Bulletin Redistribution
ESB-2021.0974
Nessus Agent 8.2.3 Fixes Multiple Vulnerabilities
19 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Nessus Agent
Publisher: Tenable
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23841 CVE-2021-23840 CVE-2021-20077
Reference: ESB-2021.0786
ESB-2021.0756
ESB-2021.0616
Original Bulletin:
https://www.tenable.com/security/tns-2021-04-0
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[R1] Nessus Agent 8.2.3 Fixes Multiple Vulnerabilities
Medium
Synopsis
Nessus Agent versions 7.2.0 through 8.2.2 were found to inadvertently capture
the IAM role security token on the local host during initial linking of the
Nessus Agent when installed on an Amazon EC2 instance. This could allow a
privileged attacker to obtain the token.
Additionally, one third-party component (OpenSSL) was found to contain
vulnerabilities, and updated versions have been made available by the provider.
Nessus Agent version 8.2.3 will update OpenSSL to 1.1.1j.
Solution
Tenable has released Nessus Agent 8.2.3 to address these issues. The
installation files can be obtained from the Tenable Downloads Portal ( https://
www.tenable.com/downloads/nessus-agents ).
Additional References
https://docs.tenable.com/releasenotes/Content/nessusagent/agent823.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
Risk Information
CVE ID: CVE-2021-23840
CVE-2021-23841
CVE-2021-20077
Tenable Advisory ID:
TNS-2021-04
Risk Factor:
Medium
CVSSv2 Base / Temporal Score:
5.0 / 3.9 (CVE-2021-23840)
5.0 / 3.9 (CVE-2021-23841)
1.7 / 1.4 (CVE-2021-20077)
CVSSv2 Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:P)(CVE-2021-23840)
(AV:N/AC:L/Au:N/C:N/I:N/A:P)(CVE-2021-23841)
(AV:L/AC:L/Au:S/C:P/I:N/A:N/E:F/RL:OF/RC:C)(CVE-2021-20077)
Affected Products
Nessus Agent 7.2.0 through 8.2.2
Advisory Timeline
2021-03-18 - [R1] Initial Release
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