CVE-2024-40586 in FortiClientWindows
Summary
by MITRE • 02/11/2025
An Improper Access Control vulnerability [CWE-284] in FortiClient Windows version 7.4.0, version 7.2.6 and below, version 7.0.13 and below may allow a local user to escalate his privileges via FortiSSLVPNd service pipe.
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Analysis
by VulDB Data Team • 07/16/2025
The vulnerability identified as CVE-2024-40586 represents a critical improper access control flaw classified under CWE-284 within FortiClient Windows software versions 7.4.0, 7.2.6 and below, and 7.0.13 and below. This weakness specifically affects the FortiSSLVPNd service pipe component which serves as a communication channel for virtual private network functionality within the FortiClient security suite. The flaw stems from insufficient authorization checks when accessing the named pipe interface, allowing unauthorized local processes to interact with privileged system components that should only be accessible to legitimate administrative operations.
The technical implementation of this vulnerability involves the FortiSSLVPNd service maintaining a named pipe endpoint that lacks proper access control mechanisms to verify the identity and privileges of connecting processes. When a local user executes malicious code or leverages existing system access, they can establish connections to this pipe without proper authentication or authorization verification. This design flaw enables privilege escalation attacks where unprivileged users can execute operations that should require administrative privileges, effectively bypassing the intended security boundaries of the FortiClient application.
Operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exposure risks. Local attackers who exploit this weakness can gain elevated privileges to perform administrative functions within the context of the FortiClient service, potentially allowing them to modify security policies, access encrypted communications, or manipulate network configurations. The attack vector is particularly concerning because it requires only local system access, making it exploitable through various attack paths including phishing, social engineering, or initial compromise of other system components. This vulnerability undermines the fundamental security model of the FortiClient application by allowing unauthorized access to privileged system resources through a well-known communication channel.
Mitigation strategies for CVE-2024-40586 should prioritize immediate software updates to versions that address the improper access control implementation in the FortiSSLVPNd service. Organizations must ensure all FortiClient installations are upgraded to patched versions that properly implement access control checks for named pipe communications. Additionally, system administrators should implement network segmentation and access control policies to limit local user privileges and reduce the potential impact of successful exploitation. Security monitoring should focus on detecting unauthorized access attempts to named pipes and unusual service interactions that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through local exploitation, and T1566 which encompasses social engineering attacks that could lead to initial local access. Organizations should also consider implementing principle of least privilege configurations and regularly audit service permissions to prevent similar access control issues from arising in other system components.