CVE-2020-15934 in FortiClientLinux
Summary
by MITRE • 12/19/2024
An execution with unnecessary privileges vulnerability in the VCM engine of FortiClient for Linux versions 6.2.7 and below, version 6.4.0. may allow local users to elevate their privileges to root by creating a malicious script or program on the target machine.
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Analysis
by VulDB Data Team • 01/22/2025
The vulnerability identified as CVE-2020-15934 represents a critical privilege escalation flaw within the Virtualization and Container Management (VCM) engine of FortiClient for Linux deployments. This issue affects versions 6.2.7 and earlier, as well as version 6.4.0, creating a significant security risk for organizations relying on Fortinet's endpoint protection solutions. The vulnerability stems from insufficient privilege checking mechanisms within the VCM engine's execution processes, which allows local attackers to exploit the system through malicious script creation.
The technical flaw manifests when the VCM engine executes processes with elevated privileges without proper validation of the executing user's permissions. This design weakness creates a path for privilege escalation where local users can manipulate the system by placing malicious executables or scripts in locations accessible to the VCM engine. The vulnerability specifically targets the engine's failure to properly enforce access controls and privilege boundaries during process execution, enabling attackers to leverage these misconfigurations for unauthorized system access.
From an operational impact perspective, this vulnerability exposes organizations to severe security risks as local users can gain root access without requiring authentication or administrative privileges. The attack vector is particularly concerning because it requires minimal prerequisites beyond local system access, making it an attractive target for both internal and external threat actors. The privilege escalation capability allows attackers to completely compromise the affected system, potentially leading to data exfiltration, lateral movement, and persistent access within the network infrastructure.
The vulnerability aligns with CWE-276, which describes improper privileges, and represents a classic example of insufficient privilege checking in system components. Organizations should consider this issue in their ATT&CK framework analysis under privilege escalation techniques, specifically targeting T1068 which addresses local privilege escalation. The attack scenario demonstrates how seemingly benign system components can become critical entry points when proper access control mechanisms are absent. Security teams must evaluate their current monitoring capabilities to detect suspicious file creation patterns or unauthorized privilege escalation attempts that could indicate exploitation of this vulnerability.
Mitigation strategies should include immediate patching of affected FortiClient versions to the latest available releases that address this privilege escalation flaw. Organizations should also implement restrictive file system permissions and monitoring for unauthorized script creation in system directories. The principle of least privilege should be enforced through proper access control configurations, and system administrators should regularly audit file permissions and execution contexts within the VCM engine's operational boundaries. Additionally, network segmentation and endpoint detection systems should be configured to alert on suspicious privilege escalation activities and unauthorized file modifications that could indicate exploitation attempts.