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AUSCERT External Security Bulletin Redistribution
ESB-2022.4812.2
Cisco Duo for macOS Authentication Bypass Vulnerability
30 September 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Duo
Publisher: Cisco Systems
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20662
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-macOS-bypass-uKZNpXE6
Revision History: September 30 2022: Vendor added workaround
September 29 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Duo for macOS Authentication Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-duo-macOS-bypass-uKZNpXE6
First Published: 2022 September 28 16:00 GMT
Last Updated: 2022 September 29 21:21 GMT
Version 1.1: Final
Workarounds: Yes
Cisco Bug IDs: CSCwc98927
CVE Names: CVE-2022-20662
CWEs: CWE-287
Summary
o A vulnerability in the smart card login authentication of Cisco Duo for
macOS could allow an unauthenticated attacker with physical access to
bypass authentication.
This vulnerability exists because the assigned user of a smart card is not
properly matched with the authenticating user. An attacker could exploit
this vulnerability by configuring a smart card login to bypass Duo
authentication. A successful exploit could allow the attacker to use any
personal identity verification (PIV) smart card for authentication, even if
the smart card is not assigned to the authenticating user.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-macOS-bypass-uKZNpXE6
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Duo for
macOS.
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Duo for Windows
Duo for Linux
Workarounds
o There is a workaround that addresses this vulnerability.
If customers prefer not to update Cisco Duo for macOS at this time, they
can disable Should bypass 2FA when using smartcard on Cisco Duo for macOS
on all devices. By requiring end users to authenticate using the Duo Prompt
after logging in to a macOS device, customers will prevent unintended
bypass of the Duo Prompt with an unverified smart card.
To disable smart card 2FA bypass, run the following command in a terminal
window:
sudo plutil -replace smartcard_bypass -bool false /private/var/root/Library/Preferences/com.duosecurity.maclogon.plist
While this workaround has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
environment.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Fixed Releases
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability that is
described in this advisory and which release included the fix for this
vulnerability.
Cisco Duo for macOS Authentication Software Release First Fixed Release
Earlier than 2.0 2.0.0
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerability that is described in this advisory.
Source
o This vulnerability was found during internal security testing.
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.
Related to This Advisory
o
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-macOS-bypass-uKZNpXE6
Revision History
o +---------+--------------------------+-------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+-------------+--------+-------------+
| 1.1 | Added workaround. | Workarounds | Final | 2022-SEP-29 |
+---------+--------------------------+-------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2022-SEP-28 |
+---------+--------------------------+-------------+--------+-------------+
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