CVE-2018-19374 in ADManager Plus
Summary
by MITRE
Zoho ManageEngine ADManager Plus 6.6 Build 6657 allows local users to gain privileges (after a reboot) by placing a Trojan horse file into the permissive bin directory.
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Analysis
by VulDB Data Team • 10/19/2025
The vulnerability identified as CVE-2018-19374 affects Zoho ManageEngine ADManager Plus version 6.6 build 6657 and represents a privilege escalation flaw that can be exploited by local attackers. This issue stems from inadequate directory permissions and file validation mechanisms within the application's installation structure. The vulnerability specifically targets the bin directory which is configured with permissive access controls, allowing unauthorized users to place malicious executables that will execute with elevated privileges upon system reboot. This type of vulnerability falls under the category of insecure permissions and improper input validation as outlined in CWE-276, where default permissions are set too broadly, creating opportunities for privilege escalation attacks.
The technical exploitation of this vulnerability requires local system access and involves placing a Trojan horse file within the permissive bin directory of the ADManager Plus application. When the system reboots, the malicious executable is launched with the privileges of the service account running the application, typically resulting in elevated system access. The flaw demonstrates poor security hygiene in application design where the installation directory lacks proper access controls and file integrity checks. Attackers can leverage this weakness to execute arbitrary code with higher privileges than initially granted, effectively bypassing standard user restrictions. This vulnerability aligns with ATT&CK technique T1068 which covers 'Local Privilege Escalation' and specifically addresses the exploitation of weak file permissions in service directories.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to establish persistent access to the compromised system. Once the malicious payload executes with elevated privileges, adversaries can modify system configurations, install additional malware, or exfiltrate sensitive data from Active Directory environments that ADManager Plus manages. The requirement for reboot to trigger execution provides a window of opportunity for detection and remediation, but also means that the system remains vulnerable during the interim period. Organizations using this software may experience unauthorized access to critical Active Directory infrastructure, potentially leading to data breaches, lateral movement within networks, and complete compromise of domain controller functions. The vulnerability underscores the importance of proper file system permissions and the principle of least privilege in service account management, as highlighted in security frameworks such as NIST SP 800-53 and ISO 27001 controls.
Mitigation strategies for this vulnerability include immediate application of vendor patches, implementation of proper directory permissions, and regular security audits of application installation directories. System administrators should conduct privilege reviews to ensure that service accounts have minimal required permissions and that no unnecessary write access exists in critical application directories. Additionally, monitoring for unauthorized file modifications in system directories and implementing file integrity monitoring solutions can help detect exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure software installation practices and proper access control configuration, as outlined in the OWASP Top 10 security principles and the Center for Internet Security (CIS) benchmarks for application security hardening.