CVE-2024-3408: Man D-tale Auth Bypass Vulnerability

CVE-2024-3408 Overview

CVE-2024-3408 is a critical vulnerability affecting man-group/dtale version 3.10.0 that combines authentication bypass with remote code execution (RCE) capabilities. The vulnerability stems from improper input validation and a hardcoded SECRET_KEY in the Flask configuration. When authentication is enabled, attackers can forge session cookies to bypass authentication. Additionally, the application fails to properly restrict custom filter queries, allowing attackers to execute arbitrary code on the server by bypassing restrictions on the /update-settings endpoint, even when enable_custom_filters is not enabled.

Critical Impact

This vulnerability allows unauthenticated attackers to bypass authentication mechanisms and achieve full remote code execution on servers running vulnerable D-Tale instances, potentially leading to complete system compromise.

Affected Products

• man-group/dtale version 3.10.0
• D-Tale Flask-based data visualization application
• Systems running vulnerable D-Tale instances with network exposure

Discovery Timeline

• 2024-06-06 - CVE-2024-3408 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-3408

Vulnerability Analysis

This vulnerability represents a chained attack combining two distinct security weaknesses. The first weakness involves the use of a hardcoded SECRET_KEY within the Flask application configuration. Flask uses this secret key to cryptographically sign session cookies, and when this key is predictable or known, attackers can forge valid session cookies to impersonate any user, effectively bypassing authentication controls entirely.

The second weakness lies in inadequate input validation for custom filter queries. Even when the enable_custom_filters configuration option is disabled, attackers can manipulate requests to the /update-settings endpoint to inject and execute arbitrary Python code on the server. This occurs because the application fails to properly sanitize user-supplied input before processing it in a context where code execution is possible.

Root Cause

The root cause of this vulnerability is twofold: First, the use of hardcoded credentials (CWE-798) through a static SECRET_KEY in the Flask configuration eliminates the cryptographic protection of session tokens. Second, improper code injection controls (CWE-94) allow malicious input to be interpreted as executable code. The combination of these weaknesses transforms what might be limited-impact individual issues into a complete authentication bypass and RCE chain.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker with network access to a vulnerable D-Tale instance can exploit this vulnerability by:

1. Session Cookie Forgery: Using the known hardcoded SECRET_KEY to craft a valid Flask session cookie, bypassing any authentication requirements
2. Code Injection via Update Settings: Sending a malicious request to the /update-settings endpoint with crafted filter parameters that escape the intended query context and execute arbitrary Python code

The vulnerability can be exploited through crafted HTTP requests to the /update-settings endpoint. The hardcoded SECRET_KEY allows attackers to forge authentication tokens, while insufficient input validation on custom filter parameters enables arbitrary code execution. For detailed technical analysis, refer to the Huntr Bounty Report.

Detection Methods for CVE-2024-3408

Indicators of Compromise

• Unusual requests to the /update-settings endpoint from external or unexpected IP addresses
• Session cookies created with suspicious timing patterns or from unknown sources
• Unexpected process spawning from the Python/D-Tale application process
• Server-side execution of commands or scripts not associated with normal D-Tale operations
• Log entries showing filter parameter manipulation or injection attempts

Detection Strategies

• Monitor HTTP requests to the /update-settings endpoint for unusual patterns or payloads containing Python code constructs
• Implement Web Application Firewall (WAF) rules to detect code injection attempts in request parameters
• Review application logs for authentication anomalies or session cookie manipulation
• Deploy endpoint detection solutions to identify unauthorized code execution from the D-Tale process

Monitoring Recommendations

• Enable verbose logging for the D-Tale application to capture all requests to sensitive endpoints
• Set up alerts for any changes to application settings or configurations from untrusted sources
• Monitor network traffic for unexpected outbound connections from systems running D-Tale
• Implement file integrity monitoring on servers hosting D-Tale instances

How to Mitigate CVE-2024-3408

Immediate Actions Required

• Update D-Tale to a patched version that addresses this vulnerability immediately
• Restrict network access to D-Tale instances to trusted networks only
• If upgrading is not immediately possible, disable external access to the application
• Review server logs for any signs of exploitation attempts or successful compromise
• Implement network segmentation to isolate D-Tale instances from critical infrastructure

Patch Information

Man Group has released a fix for this vulnerability. The patch can be found in the GitHub commit 32bd6fb4a63de779ff1e51823a456865ea3cbd13. Users should update to a version of D-Tale that includes this commit or later. The fix addresses both the hardcoded SECRET_KEY issue and the improper input validation that allowed code injection through custom filters.

Workarounds

• Place D-Tale behind a reverse proxy with strong authentication that does not rely on the application's built-in authentication
• Implement network-level access controls to restrict access to trusted IP ranges only
• Use firewall rules to block external access to the D-Tale application entirely
• Consider running D-Tale in an isolated container or virtual machine with limited permissions

# Configuration example - Restrict access via iptables
# Block external access to D-Tale default port (40000)
iptables -A INPUT -p tcp --dport 40000 -s 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport 40000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 40000 -j DROP