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AUSCERT External Security Bulletin Redistribution
ESB-2021.0786
Stand-alone Security Patches Available for Tenable.sc
versions 5.13.0 to 5.17.0
4 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tenable.sc Products
Publisher: Tenable
Operating System: Linux variants
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23841 CVE-2021-23840 CVE-2021-20076
Reference: ESB-2021.0616
ESB-2021.0613
Original Bulletin:
https://www.tenable.com/security/tns-2021-03
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Stand-alone Security Patches Available for Tenable.sc versions 5.13.0 to 5.17.0
High
Synopsis
Tenable.sc and Tenable.sc Core versions 5.13.0 through 5.17.0 were found to
contain a vulnerability that could allow an authenticated, unprivileged user to
perform Remote Code Execution (RCE) on the Tenable.sc server via Hypertext
Preprocessor unserialization.
Additionally, one third-party component (OpenSSL) was found to contain
vulnerabilities, and updated versions have been made available by the
providers. OpenSSL has been updated to version 1.1.1j.
Solution
Tenable has released 2 separate stand-alone patches to address the identified
vulnerabilities. The installation files can be obtained from the Tenable
Downloads Portal ( https://www.tenable.com/downloads/tenable-sc ).
1. CVE-2021-20076 - SC-202102.1 Patch
2. CVE-2021-23840, CVE-2021-23841 - SC-202102.2 Patch
Additional References
https://docs.tenable.com/releasenotes/Content/tenablesc/tenablesc2021021.htm
https://docs.tenable.com/releasenotes/Content/tenablesc/tenablesc2021022.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-2021-20076
CVE-2021-23840
CVE-2021-23841
Tenable Advisory ID:
TNS-2021-03
Credit:
Nicolas Verdier from TEHTRIS - CVE-2021-20076
Risk Factor:
High
CVSSv2 Base / Temporal Score:
9.0 / 7.0 (CVE-2021-20076)
5.0 / 3.9 (CVE-2021-23840)
5.0 / 3.9 (CVE-2021-23841)
CVSSv2 Vector:
(AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:OF/RC:C)(CVE-2021-20076)
(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)
Affected Products
Tenable.sc versions 5.13.0 to 5.17.0
Disclosure Timeline
2021-02-19 - Issue reported to Tenable
2021-02-20 - Issue validated
2021-03-02 - Patches released
Advisory Timeline
2021-03-02 - [R1] Initial Release
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