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AUSCERT External Security Bulletin Redistribution
ESB-2017.1432
Cisco AnyConnect Local Privilege Escalation Vulnerability
8 June 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco AnyConnect
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6638
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-anyconnect
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Cisco Security Advisory: Cisco AnyConnect Local Privilege Escalation Vulnerability
Advisory ID: cisco-sa-20170607-anyconnect
Revision: 1.0
For Public Release: 2017 June 7 16:00 GMT
Last Updated: 2017 June 7 16:00 GMT
CVE ID(s): CVE-2017-6638
CVSS Score v(3): 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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Summary
=======
A vulnerability in how DLL files are loaded with Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to install and run an executable file with privileges equivalent to the Microsoft Windows SYSTEM account.
The vulnerability is due to incomplete input validation of path and file names of a DLL file before it is loaded. An attacker could exploit this vulnerability by creating a malicious DLL file and installing it in a specific system directory. A successful exploit could allow the attacker to execute commands on the underlying Microsoft Windows host with privileges equivalent to the SYSTEM account. The attacker would need valid user credentials to exploit this vulnerability.
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-20170607-anyconnect ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-anyconnect"]
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