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AUSCERT Security Bulletin
ASB-2017.0034
[R2] Nessus 6.10.5 Fixes Two Vulnerabilities
13 April 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tenable Nessus
Operating System: FreeBSD
Windows
Linux variants
OS X
Impact/Access: Root Compromise -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
Member content until: Saturday, May 13 2017
Reference: http://www.tenable.com/security/tns-2017-10
OVERVIEW
Multiple vulnerability have been identified in Tenable Nessus prior
to version 6.10.5. [1]
IMPACT
The vendor has provided the following details regarding the
vulnerabilities:
"Nessus was found to be vulnerable to a local privilege escalation
issue and a local denial of service condition due to insecure
permissions when running in Agent Mode. This may allow an attacker
to gain administrative privileges on the system hosting a Nessus
agent. Note that these are very similar too, but different than the
Agent issue fixed in version 6.10.4.
A local privilege escalation exists due to insecure permissions.
CVSSv2 7.2 / 5.6 (AV:L/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C).
Tracked internally as NES-6137. A local denial of service condition
exists due to insecure permissions that would stop the agent from
conducting scans. CVSSv2 2.1 / 1.7
(AV:L/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C)." [1]
MITIGATION
Tenable advises users should upgrade to the latest version of
Tenable Nessus to address these issues:
"Tenable has released Nessus version 6.10.5 that corresponds to the
supported operating systems and architectures. To update your Nessus
installation, follow these steps:
Download the appropriate installation file to the system hosting
Nessus Professional or Nessus Manager, available at the Tenable
Support Portal
(https://support.tenable.com/support-center/index.php?x=&mod_id=200)
Stop the Nessus service. Install according to your operating system
procedures. Restart the Nessus service. Note that only agents are
impacted by the local privilege escalation issue, not scanners. If
Nessus Manager is updated then auto updates will be deployed to the
agents as well. If the agent is on Tenable.io then all of the agents
will receive the updates." [1]
REFERENCES
[1] [R2] Nessus 6.10.5 Fixes Two Vulnerabilities
http://www.tenable.com/security/tns-2017-10
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. 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.
===========================================================================
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.
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