CVE-2016-9192 in AnyConnect Secure Mobility Client
Summary
by MITRE
A vulnerability in Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to install and execute an arbitrary executable file with privileges equivalent to the Microsoft Windows operating system SYSTEM account. More Information: CSCvb68043. Known Affected Releases: 4.3(2039) 4.3(748). Known Fixed Releases: 4.3(4019) 4.4(225).
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Analysis
by VulDB Data Team • 10/05/2022
The vulnerability identified as CVE-2016-9192 represents a critical privilege escalation flaw within Cisco AnyConnect Secure Mobility Client for Windows platforms. This security weakness specifically affects versions 4.3(2039), 4.3(748), and potentially other releases within the 4.3.x series, creating a significant risk for systems where the AnyConnect client is deployed. The vulnerability stems from improper handling of file operations during the client installation process, which allows an authenticated local attacker to manipulate the installation environment in ways that bypass normal security controls. The flaw is particularly concerning because it enables execution of arbitrary code with the highest possible privileges available within the Windows operating system, specifically equivalent to the SYSTEM account level.
The technical nature of this vulnerability aligns with CWE-787, which describes out-of-bounds write conditions that can lead to privilege escalation. The flaw occurs when the AnyConnect client processes installation files without adequate validation of file paths or permissions, creating opportunities for attackers to inject malicious executables into the installation sequence. This type of vulnerability falls under the category of local privilege escalation attacks as defined by the MITRE ATT&CK framework, specifically mapping to technique T1068 which covers local privilege escalation through the exploitation of software vulnerabilities. The vulnerability demonstrates a failure in input validation and privilege management within the client installation mechanism, where legitimate installation processes are not properly sandboxed or restricted.
The operational impact of CVE-2016-9192 extends beyond simple unauthorized code execution, as the SYSTEM-level privileges granted to the malicious payload provide attackers with complete control over affected systems. This includes the ability to modify system files, install additional malware, access sensitive data, and potentially establish persistent backdoors within the network infrastructure. Organizations using Cisco AnyConnect clients are particularly at risk since the vulnerability requires only local authentication, meaning that any user with legitimate access to a system could exploit this weakness. The attack vector is particularly dangerous in enterprise environments where administrative privileges may be shared among multiple users, potentially allowing a single compromised account to provide full system compromise.
Organizations should immediately implement the mitigations recommended by Cisco, including upgrading to the fixed releases 4.3(4019) and 4.4(225) which contain patches addressing the privilege escalation vulnerability. System administrators should also consider implementing additional controls such as restricting local user privileges, monitoring for unauthorized installation activities, and conducting regular security assessments of AnyConnect client installations. The vulnerability highlights the importance of proper privilege separation and input validation in client software, particularly in enterprise security tools that are expected to maintain strict security boundaries. Organizations should also review their overall patch management processes to ensure timely deployment of security updates, as this vulnerability could be exploited by attackers who have already gained initial access through other means, making the system more susceptible to further compromise.