CVE-2024-2359: Lollms Web UI RCE Vulnerability

CVE-2024-2359 Overview

A critical vulnerability exists in parisneo/lollms-webui version 9.3 that allows attackers to bypass intended access restrictions and execute arbitrary code on affected systems. The vulnerability stems from improper access control on the /update_setting endpoint, which enables attackers to modify the host configuration at runtime. By manipulating this setting, attackers can circumvent the default restrictions on the /execute_code endpoint, ultimately achieving remote code execution.

Critical Impact

This vulnerability allows unauthenticated remote attackers to execute arbitrary operating system commands on the target system, potentially leading to complete system compromise, data exfiltration, and lateral movement within affected networks.

Affected Products

• lollms-webui version 9.3
• lollms lollms_web_ui (all deployments using the vulnerable version)

Discovery Timeline

• 2024-06-06 - CVE-2024-2359 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-2359

Vulnerability Analysis

This vulnerability represents a classic case of broken access control combined with OS command injection (CWE-78). The lollms-webui application implements security restrictions on the /execute_code endpoint to prevent external access by default. However, the application fails to apply equivalent access controls to the /update_setting endpoint, creating a critical security gap.

The attack exploits a two-stage process: first, the attacker leverages the unprotected /update_setting endpoint to modify the runtime host configuration to an attacker-controlled value. This manipulation effectively bypasses the access restrictions that were intended to protect the /execute_code endpoint. Once these restrictions are circumvented, the attacker can send malicious requests to /execute_code, allowing arbitrary OS command execution on the underlying system.

The vulnerability is particularly severe because it requires no authentication or user interaction to exploit, and it can be triggered entirely over the network.

Root Cause

The root cause of this vulnerability is insufficient access control implementation on the /update_setting endpoint. While the developers implemented restrictions on the sensitive /execute_code endpoint, they failed to apply equivalent protections to the configuration management endpoint. This oversight allows attackers to modify runtime settings that directly impact the security posture of other endpoints.

Additionally, the application's trust model is flawed—it assumes that if a request reaches the /update_setting endpoint, it must be from a trusted source. This assumption breaks down when the application is exposed to network access, even when the /execute_code endpoint is ostensibly protected.

Attack Vector

The attack vector for this vulnerability involves a network-based approach requiring no authentication or user interaction:

1. Reconnaissance: The attacker identifies a lollms-webui instance running version 9.3 exposed to the network
2. Configuration Manipulation: The attacker sends a crafted request to the /update_setting endpoint to modify the host configuration parameter
3. Restriction Bypass: With the host setting changed, the access restrictions on /execute_code are effectively disabled
4. Code Execution: The attacker sends malicious commands to the /execute_code endpoint, which are then executed on the underlying operating system with the privileges of the web application process

The exploitation chain leverages improper neutralization of special elements used in OS commands, allowing the attacker to inject arbitrary shell commands that the application executes without proper sanitization.

For technical details on the exploitation mechanism, refer to the Huntr Bounty Listing.

Detection Methods for CVE-2024-2359

Indicators of Compromise

• Unexpected HTTP requests to the /update_setting endpoint from external IP addresses
• Modifications to the host configuration parameter in application settings
• Sequential requests to /update_setting followed by /execute_code endpoints from the same source IP
• Unusual process spawns originating from the lollms-webui application process
• Network connections or file system modifications initiated by the web application user context

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and alert on requests to /update_setting and /execute_code endpoints
• Deploy network intrusion detection systems (NIDS) with signatures for exploitation attempts targeting lollms-webui
• Configure application logging to capture all configuration change requests with source IP attribution
• Utilize endpoint detection and response (EDR) solutions to monitor for command execution originating from web application processes

Monitoring Recommendations

• Enable verbose logging for the lollms-webui application to capture all API requests
• Monitor system processes for unexpected child processes spawned by the web application
• Implement real-time alerting for any configuration changes made through the web interface
• Review access logs regularly for patterns indicative of reconnaissance or exploitation attempts

How to Mitigate CVE-2024-2359

Immediate Actions Required

• Upgrade lollms-webui to the latest patched version immediately
• Restrict network access to lollms-webui instances using firewall rules or network segmentation
• Disable the /execute_code endpoint entirely if code execution functionality is not required
• Implement authentication and authorization controls for all administrative endpoints
• Audit existing deployments for signs of compromise before applying patches

Patch Information

Users should upgrade to the latest version of lollms-webui that addresses this vulnerability. Check the official parisneo/lollms-webui repository for security updates and patch releases. Additional details about the vulnerability and remediation can be found in the Huntr Bounty Listing.

Workarounds

• Deploy lollms-webui behind a reverse proxy with strict access controls and authentication requirements
• Use network-level restrictions to limit access to the application to trusted IP ranges only
• Implement firewall rules to block external access to sensitive endpoints (/update_setting and /execute_code)
• Run the application in a sandboxed or containerized environment to limit the impact of potential exploitation
• Monitor and alert on any access attempts to the vulnerable endpoints until patching is complete

# Example: Restrict access using iptables (Linux)
# Allow only localhost access to lollms-webui port (adjust port as needed)
iptables -A INPUT -p tcp --dport 9600 -s 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport 9600 -j DROP