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AUSCERT External Security Bulletin Redistribution
ESB-2021.1166
Cisco Advanced Malware Protection for Endpoints Windows Connector, ClamAV
for Windows, and Immunet DLL Hijacking Vulnerability
8 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco AMP for Endpoints Windows Connector
ClamAV for Windows
Immunet
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1386
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-amp-imm-dll-tu79hvkO
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Cisco Advanced Malware Protection for Endpoints Windows Connector, ClamAV for
Windows, and Immunet DLL Hijacking Vulnerability
Priority: High
Advisory ID: cisco-sa-amp-imm-dll-tu79hvkO
First Published: 2021 April 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw77090
CVE Names: CVE-2021-1386
CWEs: CWE-427
Summary
o A vulnerability in the dynamic link library (DLL) loading mechanism in
Cisco Advanced Malware Protection (AMP) for Endpoints Windows Connector,
ClamAV for Windows, and Immunet could allow an authenticated, local
attacker to perform a DLL hijacking attack on an affected Windows system.
To exploit this vulnerability, the attacker would need valid credentials on
the system.
The vulnerability is due to insufficient validation of directory search
paths at run time. An attacker could exploit this vulnerability by placing
a malicious DLL file on an affected system. A successful exploit could
allow the attacker to execute arbitrary code with SYSTEM privileges.
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-amp-imm-dll-tu79hvkO
Affected Products
o Vulnerable Products
This vulnerability affects the following products if they are running a
vulnerable software release:
Cisco AMP for Endpoints Windows Connector
ClamAV for Windows
Immunet
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
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
products:
Cisco AMP for Endpoints Android Connector
Cisco AMP for Endpoints Linux Connector
Cisco AMP for Endpoints Mac Connector
ClamAV for Unix, Linux, and MacOS
Details
o ClamAV is an open-source antivirus software that is maintained by Cisco.
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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table(s):
Product First Fixed Release
Cisco AMP for Endpoints for Windows 7.3.15
ClamAV for Windows 0.103.2
Immunet 7.4.0
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any malicious use of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank Kyriakos Economou and Tom Wilson of ZeroPeril
Ltd. 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-amp-imm-dll-tu79hvkO
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-APR-07 |
+----------+---------------------------+----------+--------+--------------+
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