Nessus Agent: Administrator Compromise -- Existing Account

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2279
                Nessus Agent 8.3.0 Fixes One Vulnerability
                               30 June 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Nessus Agent
Publisher:         Tenable
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Administrator Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-20106  

Original Bulletin: 
   https://www.tenable.com/security/tns-2021-13

- --------------------------BEGIN INCLUDED TEXT--------------------

[R1] Nessus Agent 8.3.0 Fixes One Vulnerability

High

Synopsis

Nessus Agent versions 8.2.5 and earlier were found to contain a privilege
escalation vulnerability which could allow a Nessus administrator user to
upload a specially crafted file that could lead to gaining administrator
privileges on the Nessus host.

Solution

Tenable has released Nessus Agent 8.3.0 to address these issues. The
installation files can be obtained from the Tenable Downloads Portal ( https://
www.tenable.com/downloads/nessus-agents ).

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-2021-20106
Tenable Advisory ID:
TNS-2021-13
Risk Factor:
High
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
CVSSv3 Base / Temporal Score:
7.7 / 6.9
CVSSv3 Vector:
AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C

Affected Products

Nessus Agent 8.2.5 and earlier

Advisory Timeline

2021-06-28 - [R1] Initial Release

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=Fxmv
-----END PGP SIGNATURE-----