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AUSCERT External Security Bulletin Redistribution
ESB-2021.2144
Cisco AnyConnect Secure Mobility Client for Windows Vulnerabilities
17 June 2021
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AusCERT Security Bulletin Summary
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Product: Cisco AnyConnect Secure Mobility Client
Publisher: Cisco Systems
Operating System: Windows
Cisco
Impact/Access: Administrator Compromise — Existing Account
Execute Arbitrary Code/Commands — Existing Account
Denial of Service — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1568 CVE-2021-1567
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-hMhyDfb8
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-pos-dll-ff8j6dFv
Comment: This bulletin contains two (2) Cisco Systems security advisories.
– ————————–BEGIN INCLUDED TEXT——————–
Cisco AnyConnect Secure Mobility Client for Windows Denial of Service
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-anyconnect-dos-hMhyDfb8
First Published: 2021 June 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx09155
CVE Names: CVE-2021-1568
CWEs: CWE-789
Summary
o A vulnerability in Cisco AnyConnect Secure Mobility Client for Windows
could allow an authenticated, local attacker to cause a denial of service
(DoS) condition on an affected system.
This vulnerability is due to uncontrolled memory allocation. An attacker
could exploit this vulnerability by copying a crafted file to a specific
folder on the system. A successful exploit could allow the attacker to
crash the VPN Agent service when the affected application is launched,
causing it to be unavailable to all users of the system. To exploit this
vulnerability, the attacker must have valid credentials on a multiuser
Windows system.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-hMhyDfb8
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco AnyConnect
Secure Mobility Client for Windows releases earlier than Release
4.10.01075.
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:
AnyConnect Secure Mobility Client for Linux
AnyConnect Secure Mobility Client for Mac OS
AnyConnect Secure Mobility Client for mobile device operating systems
such as iOS, Android, and Universal Windows Platform
Workarounds
o There are no workarounds that address this vulnerability.
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, Cisco AnyConnect Secure Mobility Client for
Windows releases 4.10.01075 and later contained the fix for this
vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Skylake 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-dos-hMhyDfb8
Revision History
o +———-+—————————+———-+——–+————–+
| Version | Description | Section | Status | Date |
+———-+—————————+———-+——–+————–+
| 1.0 | Initial public release. | – | Final | 2021-JUN-16 |
+———-+—————————+———-+——–+————–+
– ——————————————————————————–
Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan)
Module DLL Hijacking Vulnerability
Priority: High
Advisory ID: cisco-sa-anyconnect-pos-dll-ff8j6dFv
First Published: 2021 June 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx52084
CVE Names: CVE-2021-1567
CWEs: CWE-367
Summary
o A vulnerability in the DLL loading mechanism of Cisco AnyConnect Secure
Mobility Client for Windows could allow an authenticated, local attacker to
perform a DLL hijacking attack on an affected device if the VPN Posture
(HostScan) Module is installed on the AnyConnect client.
This vulnerability is due to a race condition in the signature verification
process for DLL files that are loaded on an affected device. An attacker
could exploit this vulnerability by sending a series of crafted
interprocess communication (IPC) messages to the AnyConnect process. A
successful exploit could allow the attacker to execute arbitrary code on
the affected device with SYSTEM privileges. To exploit this vulnerability,
the attacker must have valid credentials on the Windows system.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-pos-dll-ff8j6dFv
Affected Products
o Vulnerable Products
This vulnerability affects Cisco AnyConnect Secure Mobility Client for
Windows releases earlier than Release 4.10.01075 if the VPN Posture
(HostScan) Module is installed.
Note: The VPN Posture (HostScan) Module should not be confused with the ISE
Posture Module. The ISE Posture Module is not affected by this
vulnerability.
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:
AnyConnect Secure Mobility Client for Linux
AnyConnect Secure Mobility Client for Mac OS
AnyConnect Secure Mobility Client for mobile device operating systems
such as iOS, Android, and Universal Windows Platform
AnyConnect Secure Mobility Client for Windows with only the ISE Posture
Module installed
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Cisco fixed this vulnerability in Cisco AnyConnect Secure Mobility Client
for Windows releases 4.10.01075 and later.
To download the software from the Software Center on Cisco.com, do the
following:
1. Click Browse all .
2. Choose Security > VPN and Endpoint Security Clients > AnyConnect Secure
Mobility Client > AnyConnect Secure Mobility Client v4.x .
3. Choose a release from the left pane of the AnyConnect Secure Mobility
Client v4.x page.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Marcos Accossatto and Pablo Zurro of Core
Security 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-pos-dll-ff8j6dFv
Revision History
o +———-+—————————+———-+——–+————–+
| Version | Description | Section | Status | Date |
+———-+—————————+———-+——–+————–+
| 1.0 | Initial public release. | – | Final | 2021-JUN-16 |
+———-+—————————+———-+——–+————–+
– ————————–END INCLUDED TEXT——————–
You have received this e-mail bulletin as a result of your organisation’s
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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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