CVE-2024-48823: SlimLane LFI Privilege Escalation Flaw

CVE-2024-48823 Overview

CVE-2024-48823 is a Local File Inclusion (LFI) vulnerability affecting Automatic Systems Maintenance SlimLane, specifically in version 29565_d74ecce0c1081d50546db573a499941b10799fb7. This vulnerability allows a remote attacker to escalate privileges by exploiting the PassageAutoServer.php page. The vulnerability is network-accessible and requires no authentication or user interaction to exploit, making it particularly dangerous for exposed systems.

Critical Impact

Remote attackers can leverage this LFI vulnerability to escalate privileges, potentially gaining full control over the affected SlimLane access control systems without any prior authentication.

Affected Products

• Automatic Systems Maintenance SlimLane version 29565_d74ecce0c1081d50546db573a499941b10799fb7
• SlimLane access control systems running vulnerable firmware

Discovery Timeline

• 2024-10-14 - CVE-2024-48823 published to NVD
• 2025-03-15 - Last updated in NVD database

Technical Details for CVE-2024-48823

Vulnerability Analysis

This Local File Inclusion vulnerability exists within the PassageAutoServer.php page of the SlimLane web interface. The flaw allows attackers to include arbitrary local files from the server's filesystem through improperly sanitized user input. When exploited, an attacker can read sensitive configuration files, access credentials stored on the system, or include files that lead to code execution.

The vulnerability is classified under CWE-276 (Incorrect Default Permissions), indicating that the underlying issue relates to improper permission handling that enables the file inclusion attack to succeed with elevated privileges.

Root Cause

The root cause of this vulnerability stems from insufficient input validation in the PassageAutoServer.php endpoint. The application fails to properly sanitize file path parameters before including them, allowing directory traversal sequences and arbitrary file paths to be processed. Combined with incorrect default permissions (CWE-276), this enables attackers to access files outside the intended web directory and escalate their privileges on the system.

Attack Vector

The attack vector for CVE-2024-48823 is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests targeting the PassageAutoServer.php page with specially constructed file path parameters. The vulnerability can be exploited to:

1. Read sensitive system files such as /etc/passwd or application configuration files
2. Access stored credentials and API keys
3. Include PHP files that lead to remote code execution
4. Escalate privileges by accessing administrative configuration

The vulnerability is particularly concerning for SlimLane access control systems deployed in physical security environments, as compromise could impact building access controls and security monitoring capabilities.

Detection Methods for CVE-2024-48823

Indicators of Compromise

• Unusual HTTP requests to PassageAutoServer.php containing directory traversal patterns such as ../ sequences
• Web server logs showing attempts to access system files like /etc/passwd, /etc/shadow, or configuration files
• Unexpected file access patterns in SlimLane application logs
• Evidence of privilege escalation or unauthorized administrative access

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block Local File Inclusion patterns targeting PassageAutoServer.php
• Monitor web server access logs for directory traversal sequences (../, ..%2f, %2e%2e/) in request parameters
• Deploy intrusion detection signatures for LFI attack patterns against SlimLane systems
• Review authentication logs for unexpected administrative access following web requests

Monitoring Recommendations

• Enable verbose logging on SlimLane web interfaces and forward logs to a centralized SIEM
• Set up alerts for file access attempts outside the web application directory
• Monitor network traffic to SlimLane devices for anomalous request patterns
• Implement file integrity monitoring on critical system and configuration files

How to Mitigate CVE-2024-48823

Immediate Actions Required

• Restrict network access to SlimLane administrative interfaces using firewall rules or network segmentation
• Place SlimLane systems behind a VPN or other access control mechanism to prevent direct internet exposure
• Implement web application firewall rules to block LFI attack patterns
• Review access logs for signs of exploitation and investigate any suspicious activity

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor the Daly Blog Vulnerability Analysis for updates and contact Automatic Systems directly for remediation guidance. Until an official patch is released, implement the workarounds and network controls described below.

Workarounds

• Isolate SlimLane systems on a dedicated network segment with strict access controls
• Disable or restrict access to the PassageAutoServer.php endpoint if not operationally required
• Implement input validation at the network perimeter using a reverse proxy or WAF
• Enable additional authentication requirements for accessing the SlimLane web interface
• Regularly audit file permissions on the SlimLane system to limit the impact of file inclusion attacks

# Example: Restrict network access to SlimLane interface using iptables
# Only allow access from trusted management network (adjust IP range as needed)
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP