CVE-2024-8474: OpenVPN Connect Information Disclosure Flaw

CVE-2024-8474 Overview

CVE-2024-8474 is a sensitive data exposure vulnerability affecting OpenVPN Connect for Android. The application logs the configuration profile's clear-text private key, which an unauthorized actor can use to decrypt VPN traffic. This information disclosure flaw enables attackers with access to application logs to compromise the confidentiality of VPN communications.

Critical Impact

Exposure of clear-text private keys in application logs allows attackers to decrypt VPN traffic, completely undermining the security of encrypted communications.

Affected Products

• OpenVPN Connect for Android versions prior to 3.5.0

Discovery Timeline

• January 6, 2025 - CVE-2024-8474 published to NVD
• June 10, 2025 - Last updated in NVD database

Technical Details for CVE-2024-8474

Vulnerability Analysis

This vulnerability stems from improper removal of sensitive information before storage or transfer (CWE-212). When OpenVPN Connect processes configuration profiles, the application inadvertently writes private key material to the Android application log in clear text. This sensitive cryptographic material should never appear in logs, as application logs can be accessed by other applications with appropriate permissions, through Android Debug Bridge (ADB), or by attackers who gain access to device storage.

The exposure of private keys through logging represents a fundamental security failure in handling cryptographic secrets. Once an attacker obtains the private key, they can decrypt captured VPN traffic, effectively nullifying the encryption protections that users rely on for secure communications.

Root Cause

The root cause is improper handling of sensitive cryptographic material during configuration profile processing. The application fails to sanitize or redact the private key before writing log entries, violating the principle that sensitive credentials should never be logged regardless of log level or debug settings.

Attack Vector

This vulnerability is exploitable over the network without requiring user interaction or special privileges. An attacker who gains access to the device's application logs—whether through malware, physical device access, or backup extraction—can retrieve the clear-text private key. With this key, the attacker can:

1. Passively decrypt previously captured VPN traffic
2. Perform man-in-the-middle attacks on future VPN sessions
3. Impersonate the legitimate user to the VPN server

The attack requires access to application logs where the private key is stored, which could be obtained through various means including compromised backup files, malicious applications with log access permissions, or direct device access.

Detection Methods for CVE-2024-8474

Indicators of Compromise

• Unexpected access to Android application log files containing OpenVPN Connect entries
• Evidence of ADB connections or backup extractions from affected devices
• Anomalous VPN traffic patterns indicating potential decryption or interception
• Unauthorized applications requesting log read permissions on devices running vulnerable OpenVPN Connect versions

Detection Strategies

• Monitor for unauthorized access attempts to Android application logs on managed devices
• Audit installed OpenVPN Connect versions across the enterprise and flag any installations below 3.5.0
• Implement network traffic analysis to detect potential man-in-the-middle attacks on VPN connections
• Review device backup procedures to ensure logs containing sensitive data are not inadvertently exposed

Monitoring Recommendations

• Enable centralized logging and alerting for mobile device management (MDM) solutions to track application versions
• Deploy endpoint detection to identify applications attempting to access OpenVPN Connect log files
• Monitor VPN server authentication logs for anomalous connection patterns that may indicate credential compromise
• Establish baseline VPN usage patterns to detect potential abuse of compromised credentials

How to Mitigate CVE-2024-8474

Immediate Actions Required

• Upgrade OpenVPN Connect for Android to version 3.5.0 or later immediately
• Rotate all VPN private keys and certificates that may have been used with vulnerable versions
• Clear application logs on affected devices to remove any stored private key material
• Audit devices for signs of unauthorized log access or data exfiltration
• Review and revoke any potentially compromised VPN credentials

Patch Information

OpenVPN has addressed this vulnerability in OpenVPN Connect version 3.5.0 for Android. Users should update through the Google Play Store or obtain the latest version from official OpenVPN distribution channels. Detailed release information is available in the OpenVPN Android Release Notes.

Workarounds

• If immediate upgrade is not possible, avoid importing new configuration profiles on vulnerable versions
• Disable or restrict ADB access on production devices running vulnerable versions
• Implement application-level isolation policies through MDM to limit log access by other applications
• Consider temporarily using alternative VPN clients until upgrade can be completed
• Enforce device encryption to protect log files at rest

# Verify OpenVPN Connect version on Android device (via ADB)
adb shell dumpsys package net.openvpn.openvpn | grep versionName

# Clear application logs to remove potentially exposed keys
adb shell pm clear net.openvpn.openvpn

# Check for vulnerable versions in enterprise MDM (example query)
# Review your MDM solution's documentation for specific commands