CVE-2023-5074: D-Link D-View 8 Auth Bypass Vulnerability

CVE-2023-5074 Overview

CVE-2023-5074 is an authentication bypass vulnerability affecting D-Link D-View 8 network management software. The vulnerability stems from the use of a static (hardcoded) cryptographic key to protect JWT (JSON Web Token) tokens used in user authentication. This weakness allows unauthenticated attackers to forge valid JWT tokens and bypass authentication mechanisms entirely, gaining unauthorized access to the D-View 8 management interface.

Critical Impact

Attackers can completely bypass authentication and gain full administrative access to D-Link D-View 8 network management systems without valid credentials, potentially compromising entire network infrastructures.

Affected Products

• D-Link D-View 8 version 2.0.1.28
• dlink:d-view_8 (CPE: cpe:2.3:a:dlink:d-view_8:2.0.1.28:*:*:*:*:*:*:*)

Discovery Timeline

• September 20, 2023 - CVE-2023-5074 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-5074

Vulnerability Analysis

This vulnerability is classified under CWE-798 (Use of Hard-coded Credentials). D-Link D-View 8 version 2.0.1.28 employs a static cryptographic key to sign and verify JWT tokens used for user authentication. JWT tokens are a common mechanism for maintaining authenticated sessions in web applications, but their security fundamentally depends on the secrecy of the signing key.

When a static key is embedded in the application code or configuration, any attacker who discovers or extracts this key can generate arbitrary valid JWT tokens. This allows complete impersonation of any user, including administrators, without requiring knowledge of actual credentials.

The vulnerability is exploitable over the network without any prior authentication or user interaction, making it particularly dangerous for internet-exposed D-View 8 installations.

Root Cause

The root cause is the implementation of a hardcoded (static) cryptographic key within the D-Link D-View 8 application for JWT token signing and verification. This design flaw violates fundamental cryptographic security principles:

1. Key Reuse Across Installations: All D-View 8 v2.0.1.28 installations use the same static key, meaning if one instance is compromised, all instances are vulnerable
2. Key Discovery: Static keys embedded in software can be extracted through reverse engineering, memory analysis, or configuration file examination
3. No Key Rotation: Hardcoded keys cannot be rotated without software updates, leaving systems perpetually vulnerable once the key is known

Attack Vector

The attack can be executed remotely over the network against any D-Link D-View 8 v2.0.1.28 installation. An attacker who has obtained the static JWT signing key can:

1. Analyze the JWT token structure used by D-View 8
2. Extract or discover the hardcoded signing key from the application
3. Craft a malicious JWT token with elevated privileges (e.g., administrator role)
4. Sign the forged token using the static key
5. Submit the forged token to the D-View 8 application to gain unauthorized access

The attack requires no privileges, no user interaction, and can be executed against any network-accessible D-View 8 instance. For detailed technical information, refer to the Tenable Threat Research Advisory.

Detection Methods for CVE-2023-5074

Indicators of Compromise

• Unusual administrative login activity or sessions from unexpected IP addresses
• JWT tokens with unexpected or anomalous claims appearing in authentication logs
• Multiple concurrent sessions for the same administrative user from different locations
• Authentication events without corresponding credential validation in upstream systems

Detection Strategies

• Monitor D-View 8 authentication logs for logins from unusual source IPs or at unexpected times
• Implement network-level monitoring for anomalous traffic patterns to D-View 8 management ports
• Deploy intrusion detection signatures that identify JWT manipulation attempts
• Correlate D-View 8 access with other authentication systems to detect inconsistencies

Monitoring Recommendations

• Enable verbose logging on D-View 8 and forward logs to a centralized SIEM
• Configure alerts for administrative actions performed outside of normal business hours
• Monitor for configuration changes or new user account creation in D-View 8
• Regularly audit user sessions and active tokens within the management interface

How to Mitigate CVE-2023-5074

Immediate Actions Required

• Identify all D-Link D-View 8 installations running version 2.0.1.28 in your environment
• Restrict network access to D-View 8 management interfaces using firewall rules or network segmentation
• Place D-View 8 instances behind a VPN or other access control mechanism
• Monitor for any signs of unauthorized access while awaiting a patch

Patch Information

Organizations should check D-Link's official support channels for security updates addressing CVE-2023-5074. Detailed information about this vulnerability is available in the Tenable Threat Research Advisory (TRA-2023-32). Contact D-Link support for the latest firmware or software version that addresses this authentication bypass vulnerability.

Workarounds

• Implement network-level access controls to restrict D-View 8 access to trusted IP addresses only
• Place D-View 8 management interfaces behind a reverse proxy with additional authentication
• Segment D-View 8 management traffic to a dedicated management VLAN
• Consider temporarily disabling D-View 8 if it is not operationally critical until a patch is applied
• Enable comprehensive logging and monitoring to detect potential exploitation attempts