CVE-2019-14969 in Auditor
Summary
by MITRE
Netwrix Auditor before 9.8 has insecure permissions on %PROGRAMDATA%\Netwrix Auditor\Logs\ActiveDirectory\ and sub-folders. In addition, the service Netwrix.ADA.StorageAuditService (which writes to that directory) does not perform proper impersonation, and thus the target file will have the same permissions as the invoking process (in this case, granting Authenticated Users full access over the target file). This vulnerability can be triggered by a low-privileged user to perform DLL Hijacking/Binary Planting attacks and ultimately execute code as NT AUTHORITY\SYSTEM with the help of Symbolic Links.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/23/2023
The vulnerability identified as CVE-2019-14969 affects Netwrix Auditor versions prior to 9.8 and represents a critical privilege escalation flaw stemming from improper file system permissions and service impersonation weaknesses. This vulnerability resides within the ActiveDirectory logging directory structure located at %PROGRAMDATA%\Netwrix Auditor\Logs\ActiveDirectory\ and its subdirectories, creating an exploitable attack surface that allows low-privileged users to gain elevated system access. The root cause lies in the insecure default permissions assigned to these directories, which grant excessive access rights to authenticated users, violating fundamental security principles of least privilege and access control.
The technical implementation of this vulnerability exploits a combination of directory permission flaws and service misconfiguration within the Netwrix.ADA.StorageAuditService component. This service operates with elevated privileges and writes log files to the vulnerable directory structure without proper impersonation mechanisms. When a low-privileged user creates symbolic links or places malicious DLLs in the target directory, the service processes these files with the permissions of the invoking process, which in this case includes authenticated users. This behavior creates a dangerous privilege escalation vector where the service inadvertently grants full control permissions to users who should not have such access, effectively bypassing normal Windows access control mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass full system compromise capabilities. Attackers can leverage this flaw through DLL hijacking or binary planting techniques, where malicious code is placed in the vulnerable directory structure and subsequently executed with NT AUTHORITY\SYSTEM privileges. This represents a sophisticated attack pattern that aligns with the MITRE ATT&CK framework's privilege escalation tactics, specifically targeting the 'Exploitation for Privilege Escalation' and 'Registry Run Keys / Startup Folder' techniques. The vulnerability's exploitation requires minimal privileges initially but ultimately provides attackers with complete system control, making it particularly dangerous in enterprise environments where authenticated user access is common.
The security implications of CVE-2019-14969 align with CWE-276, which describes insecure permissions and inadequate access control mechanisms. This vulnerability demonstrates a classic case of improper privilege management where service components fail to properly isolate their execution context from user-level access. Organizations running affected versions of Netwrix Auditor face significant risk of unauthorized code execution, data exfiltration, and persistent system compromise. The vulnerability's exploitation pathway through symbolic links and DLL hijacking techniques also reflects common attack patterns documented in cybersecurity frameworks and threat intelligence reports.
Mitigation strategies for this vulnerability require immediate patching of Netwrix Auditor to version 9.8 or later, where the insecure permissions have been corrected and proper impersonation mechanisms have been implemented. System administrators should also conduct thorough permission audits of the affected directory structure, ensuring that only authorized service accounts maintain write access to the logging directories. Additional protective measures include implementing least privilege principles for service accounts, monitoring for unauthorized symbolic link creation, and deploying application whitelisting solutions to prevent execution of unauthorized binaries. The vulnerability serves as a reminder of the critical importance of proper service impersonation and access control configuration in enterprise security architectures, particularly when dealing with services that handle sensitive data and operate with elevated privileges.