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Vulnerability of Cisco AnyConnect VPN Client for Windows: privilege escalation via program install

Synthesis of the vulnerability 

An attacker can create an INF file for Cisco AnyConnect VPN Client for Windows, in order to make it run any program with the privileges of the SYSTEM account.
Impacted software: AnyConnect VPN Client.
Severity of this computer vulnerability: 3/4.
Creation date: 24/06/2015.
Références of this announce: 39466, CVE-2015-4211, VIGILANCE-VUL-17218.

Description of the vulnerability 

The Cisco AnyConnect VPN Client for Windows product can install programs.

To describe what is to be done, it uses the INF file format inherited from Windows 3. However, it does not check the path of programs to be run specified in the INF file. So, an attacker can choose which program will be run.

An attacker can therefore create an INF file for Cisco AnyConnect VPN Client for Windows, in order to make it run any program with the privileges of the SYSTEM account.
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This computer weakness impacts software or systems such as AnyConnect VPN Client.

Our Vigil@nce team determined that the severity of this vulnerability note is important.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this cybersecurity threat.

Solutions for this threat 

Cisco AnyConnect Client: solution CSCus65862.
The solution CSCus65862 is available:
  https://tools.cisco.com/bugsearch/bug/CSCus65862
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