CVE-2022-40682 in FortiClient
Summary
by MITRE • 04/11/2023
A incorrect authorization in Fortinet FortiClient (Windows) 7.0.0 - 7.0.7, 6.4.0 - 6.4.9, 6.2.0 - 6.2.9 and 6.0.0 - 6.0.10 allows an attacker to execute unauthorized code or commands via sending a crafted request to a specific named pipe.
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Analysis
by VulDB Data Team • 04/11/2023
This vulnerability represents a critical authorization flaw in Fortinet FortiClient Windows implementations across multiple version ranges including 7.0.0-7.0.7, 6.4.0-6.4.9, 6.2.0-6.2.9, and 6.0.0-6.0.10. The issue stems from improper access control mechanisms within the application's named pipe communication system, which serves as a inter-process communication channel for legitimate administrative functions. The vulnerability falls under the CWE-285 category of Improper Authorization, specifically manifesting as insufficient access control over named pipes that should only be accessible to authorized administrative processes. Attackers can exploit this weakness by crafting malicious requests that target specific named pipe endpoints, bypassing the intended authentication and authorization checks that should prevent unauthorized execution of code or commands.
The technical exploitation occurs through the manipulation of named pipe access permissions and communication protocols within the Windows operating system. FortiClient's implementation fails to properly validate incoming requests to its named pipes, allowing local attackers with minimal privileges to send crafted payloads that trigger unauthorized code execution. This represents a privilege escalation vulnerability where an unprivileged user can leverage the named pipe interface to execute arbitrary commands with elevated privileges. The attack vector specifically targets the Windows named pipe mechanism which FortiClient uses for internal communication between different components of the application. This flaw demonstrates a fundamental breakdown in the principle of least privilege, where the application fails to properly enforce access controls that should restrict pipe access to authorized processes only.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise potential. An attacker who successfully exploits this vulnerability can gain unauthorized access to system resources, potentially leading to data exfiltration, system persistence, or further lateral movement within a network environment. The vulnerability affects enterprise environments where FortiClient is deployed, as it allows attackers to bypass endpoint protection mechanisms that the software is designed to provide. This creates a dangerous scenario where the security tool itself becomes a vector for attack, undermining the trust model that organizations place in endpoint protection solutions. The vulnerability is particularly concerning in environments where FortiClient is installed on systems with elevated privileges or where it interacts with sensitive system components. The attack requires minimal sophistication and can be automated, making it attractive to both opportunistic attackers and more advanced threat actors.
Mitigation strategies should focus on immediate patching of affected FortiClient versions to address the authorization flaw in named pipe handling. Organizations should also implement network segmentation to limit access to systems running FortiClient, particularly restricting communication between different network segments. Additionally, monitoring for unusual named pipe access patterns and unauthorized command execution attempts should be implemented as part of security operations. The vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter and T1547.001 for Registry Run Keys/Startup Folder, as exploitation can lead to persistent access through command execution and system-level modifications. System administrators should also consider disabling unnecessary named pipe functionality where possible and implementing strict access control lists for pipe endpoints. Regular security assessments should be conducted to identify other potential authorization flaws in similar endpoint protection software, as this vulnerability demonstrates the critical importance of proper access control implementation in security tools.