CVE-2025-2769: Bdrive NetDrive Privilege Escalation Flaw

CVE-2025-2769 Overview

CVE-2025-2769 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 location on disk. A local attacker with the ability to execute low-privileged code on the target system can plant a malicious OpenSSL configuration file that the product will load. Successful exploitation results in arbitrary code execution in the context of SYSTEM. The issue was reported through the Zero Day Initiative as ZDI-CAN-25295 and disclosed as ZDI-25-183.

Critical Impact
A low-privileged local user can escalate to SYSTEM on affected Windows hosts running Bdrive NetDrive by planting a crafted OpenSSL configuration file in the unsecured search path.

Affected Products

Bdrive NetDrive 3.17.960
Windows installations running the affected NetDrive client
Environments where NetDrive runs as a privileged service

Discovery Timeline

2025-04-23 - CVE-2025-2769 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-2769

Vulnerability Analysis

Bdrive NetDrive links against OpenSSL and, at runtime, resolves the path to its OpenSSL configuration file (openssl.cnf) from a location that is writable by non-privileged users. When the NetDrive process runs with elevated privileges, it parses the attacker-controlled configuration file and applies the settings it contains. OpenSSL configuration files support directives that load external engine or provider modules from disk. An attacker who controls the configuration file can therefore direct the privileged process to load an arbitrary DLL, achieving code execution under the security context of the loading process.

The vulnerability is classified under CWE-427: Uncontrolled Search Path Element and is closely related to classic DLL search order and configuration hijacking issues on Windows.

Root Cause

The root cause is the resolution of the OpenSSL configuration path to a directory that lacks appropriate access controls. Privileged code should load trusted configuration only from locations writable exclusively by administrators, such as a subdirectory of Program Files. Loading configuration from a user-writable or world-writable path violates that trust boundary and enables local attackers to influence the behavior of a SYSTEM-level process.

Attack Vector

Exploitation requires prior local code execution as a low-privileged user. The attacker writes a crafted openssl.cnf into the unsecured directory that NetDrive searches. The configuration references an attacker-supplied engine or provider module, typically a DLL placed alongside the configuration file. When the privileged NetDrive component initializes OpenSSL, it reads the malicious configuration and loads the attacker's module, executing the payload as SYSTEM. No user interaction and no network access are required.

Full technical details are documented in the Zero Day Initiative advisory ZDI-25-183.

Detection Methods for CVE-2025-2769

Indicators of Compromise

Presence of an openssl.cnf file in a non-standard, user-writable directory referenced by the NetDrive process
Unexpected DLLs referenced via engines or providers sections of an OpenSSL configuration file loaded by NetDrive
Child processes of NetDrive components running as SYSTEM that spawn interactive shells, cmd.exe, or powershell.exe

Detection Strategies

Monitor file creation and modification events for openssl.cnf in any directory outside of trusted, administrator-controlled paths.
Alert on module loads from user-writable directories into NetDrive processes using Sysmon Event ID 7 (ImageLoad).
Correlate low-privileged user activity followed by SYSTEM-context process creation originating from NetDrive binaries.

Monitoring Recommendations

Enable Sysmon with a configuration that logs ProcessCreate, FileCreate, and ImageLoad events for the NetDrive installation directory and user profile paths.
Baseline the legitimate load paths of OpenSSL configuration and engine DLLs on hosts running NetDrive, and alert on deviations.
Review Windows Application and Security event logs for repeated OpenSSL initialization failures, which can indicate exploitation attempts or misconfigured payloads.

How to Mitigate CVE-2025-2769

Immediate Actions Required

Inventory all endpoints running Bdrive NetDrive 3.17.960 and prioritize them for remediation.
Restrict interactive and remote low-privileged access on hosts where NetDrive is installed until a fix is applied.
Audit the filesystem locations from which NetDrive resolves openssl.cnf and remove any untrusted files present.

Patch Information

At the time of writing, no vendor advisory URL is listed in the NVD entry for CVE-2025-2769. Administrators should consult Bdrive directly and monitor the Zero Day Initiative advisory ZDI-25-183 for updates on a fixed release.

Workarounds

Apply NTFS access control lists that remove write permissions for non-administrator users on the directory from which NetDrive loads openssl.cnf.
Set the OPENSSL_CONF environment variable for the NetDrive service to an explicit path under an administrator-controlled directory, and remove any pre-existing configuration file from unsecured locations.
Where feasible, run NetDrive under a lower-privileged service account to reduce the impact of successful exploitation.

bash

# Configuration example: restrict ACLs on the OpenSSL config directory (Windows)
icacls "C:\Program Files\Bdrive\NetDrive\ssl" /inheritance:r
icacls "C:\Program Files\Bdrive\NetDrive\ssl" /grant:r "SYSTEM:(OI)(CI)F" "Administrators:(OI)(CI)F" "Users:(OI)(CI)RX"
icacls "C:\Program Files\Bdrive\NetDrive\ssl\openssl.cnf" /grant:r "SYSTEM:F" "Administrators:F" "Users:R"