CVE-2025-2768: Bdrive NetDrive Privilege Escalation Flaw

CVE-2025-2768 Overview

CVE-2025-2768 is a local privilege escalation vulnerability in Bdrive NetDrive caused by an uncontrolled search path element [CWE-427]. The product loads an OpenSSL configuration file from an unsecured filesystem location. A local attacker with low-privileged code execution on the target host can plant a malicious openssl.cnf and have it loaded by the NetDrive service. Successful exploitation runs attacker-supplied code in the context of SYSTEM. The issue was reported through the Zero Day Initiative as ZDI-CAN-25041 and disclosed in advisory ZDI-25-182.

Critical Impact
Local attackers with limited privileges can execute arbitrary code as SYSTEM on Windows hosts running the affected Bdrive NetDrive version.

Affected Products

Bdrive NetDrive version 3.17.960
Windows installations running the NetDrive service
Environments loading OpenSSL configuration from writable paths

Discovery Timeline

2025-04-23 - CVE-2025-2768 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-2768

Vulnerability Analysis

Bdrive NetDrive links against OpenSSL and reads its runtime configuration from a path that is not restricted to privileged users. When the NetDrive service starts, OpenSSL parses the configuration file and can load engines, providers, or additional modules referenced in that file. Because the search path resolves to a location writable by low-privileged accounts, an attacker can substitute a controlled configuration.

The attacker-controlled configuration directs OpenSSL to load a malicious DLL as a provider or engine. The DLL executes inside the NetDrive service process, which runs as SYSTEM. The result is a full local privilege escalation from a standard user to the highest Windows integrity level.

Root Cause

The root cause is an uncontrolled search path element [CWE-427] in how NetDrive locates its OpenSSL configuration file. The application does not pin the configuration path to a protected directory, nor does it validate the trust of the loaded file. Any user with write access to the resolved path can influence OpenSSL initialization inside a privileged process.

Attack Vector

Exploitation requires local code execution as a low-privileged user. The attacker writes a crafted openssl.cnf and a companion module to a location searched by the NetDrive process. When the service initializes OpenSSL, it parses the planted configuration and loads the attacker module. Refer to the Zero Day Initiative Advisory ZDI-25-182 for the vendor-coordinated technical details.

// No verified public proof-of-concept code is available.
// See ZDI-25-182 for vendor-coordinated technical details.

Detection Methods for CVE-2025-2768

Indicators of Compromise

Presence of an openssl.cnf file in a user-writable directory referenced by NetDrive at startup
Unexpected DLLs loaded by the NetDrive service process from non-standard paths
Newly created files matching OpenSSL engine or provider naming conventions in application or temp directories
NetDrive service spawning child processes or performing operations inconsistent with normal file synchronization

Detection Strategies

Monitor image loads by the NetDrive service and alert on DLLs originating from user-writable directories
Audit filesystem writes to the NetDrive installation directory and any OpenSSL configuration search paths
Baseline the expected openssl.cnf location and content, then alert on drift
Correlate low-privileged process activity that writes openssl.cnf with subsequent NetDrive service restarts

Monitoring Recommendations

Enable Windows Sysmon event ID 7 (Image Loaded) for the NetDrive service binary
Forward process creation, image load, and file create telemetry to a centralized analytics platform
Track service restarts of NetDrive and correlate against preceding filesystem writes by non-admin users
Review scheduled tasks and autoruns that could trigger repeated NetDrive service initialization

How to Mitigate CVE-2025-2768

Immediate Actions Required

Restrict write permissions on any directory in the OpenSSL configuration search path used by NetDrive
Remove any unauthorized openssl.cnf files found on hosts running NetDrive
Limit local logon rights on systems where NetDrive is installed to reduce the pool of potential attackers
Inventory all endpoints running NetDrive 3.17.960 and prioritize them for remediation

Patch Information

Refer to the Zero Day Initiative Advisory ZDI-25-182 and the Bdrive vendor site for updated NetDrive builds addressing the uncontrolled search path. At the time of the NVD entry, no vendor advisory URL was listed in the CVE record. Apply the fixed release once published by Bdrive and validate that the OpenSSL configuration is loaded from a protected system path.

Workarounds

Set the OPENSSL_CONF environment variable to a system-protected path for the NetDrive service account
Apply strict Access Control Lists (ACLs) that deny write access to non-administrative users on NetDrive directories
Disable or stop the NetDrive service on hosts where it is not required until a patch is applied
Use Windows AppLocker or Windows Defender Application Control to block DLL loads from user-writable paths

bash

# Example: restrict write permissions on the NetDrive install directory (run as Administrator)
icacls "C:\Program Files\Bdrive\NetDrive" /inheritance:r
icacls "C:\Program Files\Bdrive\NetDrive" /grant:r "SYSTEM:(OI)(CI)F" "Administrators:(OI)(CI)F" "Users:(OI)(CI)RX"

# Pin OpenSSL configuration to a protected path for the service account
setx /M OPENSSL_CONF "C:\Program Files\Common Files\SSL\openssl.cnf"