ESB-2021.1550 – [Mac] Cisco AnyConnect Secure Mobility Client: Root compromise – Existing account

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AUSCERT External Security Bulletin Redistribution

ESB-2021.1550
MacOS Local Privilege Escalation Exploitable through Cisco
AnyConnect Secure Mobility Client
6 May 2021

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AusCERT Security Bulletin Summary
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Product: Cisco AnyConnect Secure Mobility Client
Publisher: Cisco Systems
Operating System: Mac OS
Impact/Access: Root Compromise — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-9817

Reference: ESB-2020.1859

Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-mac-priv-esc-VqST2nrT

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MacOS Local Privilege Escalation Exploitable through Cisco AnyConnect Secure
Mobility Client

Priority: Informational
Advisory ID: cisco-sa-anyconnect-mac-priv-esc-VqST2nrT
First Published: 2021 May 5 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available

Summary

o On May 26, 2020, Apple released a security update for MacOS Catalina,
Mojave, and High Sierra. Part of this update addressed a local privilege
escalation vulnerability (CVE-2020-9817).

Cisco has determined that Cisco AnyConnect Secure Mobility Client releases
4.10.00093 and earlier could be used to exploit this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-mac-priv-esc-VqST2nrT

Details

o The MacOS Installer process extracts the contents of an application package
to a temporary folder before execution. Instead of assigning ownership of
these files to the root user, the original UID from the developer’s system
is maintained. A local attacker with the same UID as the extracted files
could modify them to execute code on the underlying operating system with
root privileges.

Additional information about this vulnerability is available at the
following links:

About the security content of macOS Catalina 10.15.5, Security Update
2020-003 Mojave, Security Update 2020-003 High Sierra
Technical Advisory – macOS Installer Local Root Privilege Escalation
(CVE-2020-9817)

Recommendations

o Cisco customers are advised to apply the Apple security update on all
affected operating systems where Cisco applications or products are
running.

Cisco will update Cisco AnyConnect Secure Mobility Client in the next
release to address this MacOS Installer vulnerability.

Source

o Cisco would like to thank the Lockheed Martin Red Team for reporting this
vulnerability.

Cisco Security Vulnerability Policy

o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.

URL

o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-mac-priv-esc-VqST2nrT

Revision History

o +———-+—————————+———-+——–+————–+
| Version | Description | Section | Status | Date |
+———-+—————————+———-+——–+————–+
| 1.0 | Initial public release. | – | Final | 2021-MAY-05 |
+———-+—————————+———-+——–+————–+

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You have received this e-mail bulletin as a result of your organisation’s
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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.
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