CVE-2024-37825

Executive Summary

CVE-2024-37825 is a directory traversal vulnerability in EnvisionWare Computer Access & Reservation Control SelfCheck v1.0. An unauthenticated attacker on the same network can exploit this flaw to read arbitrary files from the server, potentially exposing sensitive configuration data, credentials, or other critical information. The vulnerability is fixed in OneStop 3.2.0.27184 Hotfix May 2024. No public exploit code or Nuclei template is available at this time, but the attack vector is well-understood and poses a significant risk to unpatched systems.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a proprietary library management system from EnvisionWare.

CVSS Breakdown & Threat Level

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

• Attack Vector (AV): Adjacent Network (A) – attacker must be on the same network.
• Attack Complexity (AC): Low (L) – no special conditions.
• Privileges Required (PR): None (N) – unauthenticated.
• User Interaction (UI): None (N) – no user action needed.
• Scope (S): Unchanged (U) – vulnerable component only.
• Confidentiality (C): High (H) – arbitrary file read.
• Integrity (I): None (N) – no write capability.
• Availability (A): None (N) – no denial of service.

Estimated CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Estimated Base Score: 6.5 (Medium)

Threat Level: Medium. The requirement for network adjacency reduces the attack surface, but the lack of authentication and potential for sensitive data exposure makes it a serious concern for internal networks.

Deep Dive & Mechanics

The vulnerability is a classic directory traversal (path traversal) flaw in the SelfCheck v1.0 component of EnvisionWare's Computer Access & Reservation Control system. The application fails to properly sanitize user-supplied input used in file path construction. An unauthenticated attacker can send a crafted HTTP request containing path traversal sequences (e.g., ../) to read files outside the intended web root directory.

Root Cause: The application likely uses user input to specify a file to retrieve (e.g., a report, log, or configuration file) without validating that the resulting path stays within an allowed directory. By injecting ../ sequences, the attacker can navigate up the directory tree and access arbitrary files.

Attack Vector: The attacker must be on the same network as the vulnerable server. This could be a local network in a library, university, or other public facility. The attack is performed over HTTP.

Impact: Successful exploitation allows an unauthenticated attacker to read any file the web server process has access to. This includes:

• Application configuration files (e.g., web.config, appsettings.json)
• Database connection strings
• User credentials or session tokens
• Operating system files (e.g., /etc/passwd on Linux, SAM on Windows)
• Source code of the application

Vulnerable vs. Patched Code

Vulnerable Code (SelfCheck v1.0): The vulnerable code likely resembles the following (pseudo-code):

string filePath = Request.QueryString["file"];
string fullPath = Server.MapPath("~/Reports/" + filePath);
string content = File.ReadAllText(fullPath);
Response.Write(content);

In this example, the file parameter is directly concatenated into the path without validation.

Patched Code (OneStop 3.2.0.27184): The patched version likely implements proper path validation:

string filePath = Request.QueryString["file"];
string basePath = Server.MapPath("~/Reports/");
string fullPath = Path.GetFullPath(Path.Combine(basePath, filePath));
if (!fullPath.StartsWith(basePath))
{
    throw new SecurityException("Invalid path.");
}
string content = File.ReadAllText(fullPath);
Response.Write(content);

The fix uses Path.GetFullPath to resolve the absolute path and then checks that it starts with the allowed base directory.

Exploitation & Lab Setup

Red Team (Exploitation)

Lab Setup:

1. Install EnvisionWare SelfCheck v1.0 on a Windows server (e.g., Windows Server 2019) in a controlled lab environment.
2. Ensure the web application is accessible on the local network (e.g., http://192.168.1.100/SelfCheck).
3. From an attacker machine on the same network, use a tool like curl or a web browser.

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns include:
   • /SelfCheck/GetFile.aspx?file=
   • /SelfCheck/Download.aspx?path=
   • /SelfCheck/LogViewer.aspx?log=
2. Send a crafted request to read a sensitive file:

   curl "http://192.168.1.100/SelfCheck/GetFile.aspx?file=../../../Windows/System32/drivers/etc/hosts"
   

3. If successful, the contents of the hosts file will be returned.
4. Attempt to read application configuration:

   curl "http://192.168.1.100/SelfCheck/GetFile.aspx?file=../web.config"
   

Expected Output: The server will return the contents of the requested file if the path traversal is successful.

Blue Team (Detection & Response)

Detection Steps:

1. Monitor web server logs for suspicious patterns:
   • Multiple ../ sequences in request parameters.
   • Requests to files outside the web root (e.g., Windows/System32, etc/passwd).
   • Unusual file extensions being requested (e.g., .config, .asp, .exe).
2. Enable file integrity monitoring on critical system files.
3. Use a Web Application Firewall (WAF) to block path traversal attempts.

Response Steps:

1. Immediately isolate the affected server from the network.
2. Review web server logs to determine the extent of the breach.
3. Check for any files that may have been exfiltrated.
4. Apply the vendor patch (OneStop 3.2.0.27184 Hotfix May 2024) or implement virtual patching via WAF.
5. Rotate any credentials that may have been exposed.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests containing ../ or ..%2f in the URI or query string.
• Requests to endpoints like /SelfCheck/GetFile.aspx, /SelfCheck/Download.aspx, or similar.
• Outbound data transfers from the server to external IPs (if exfiltration occurred).

File System IOCs:

• Unauthorized access to files outside the web root (e.g., web.config, appsettings.json, SAM, /etc/shadow).
• Modified web server logs (if attacker attempted to cover tracks).

Log IOCs:

• Web server logs showing 200 responses to path traversal attempts.
• Event logs showing access to sensitive files by the web server process.

Detection Engineering

YARA Rule

rule CVE_2024_37825_Directory_Traversal {
    meta:
        description = "Detects directory traversal attempts targeting EnvisionWare SelfCheck v1.0"
        author = "Valters IT"
        date = "2024-07-01"
        reference = "CVE-2024-37825"
    strings:
        $traversal1 = "../"
        $traversal2 = "..\\"
        $traversal3 = "%2e%2e%2f"
        $traversal4 = "%2e%2e/"
        $sensitive1 = "web.config"
        $sensitive2 = "etc/passwd"
        $sensitive3 = "boot.ini"
        $sensitive4 = "autoexec.bat"
    condition:
        any of ($traversal*) and any of ($sensitive*)
}

Sigma Rule

title: CVE-2024-37825 Directory Traversal Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects directory traversal attempts against EnvisionWare SelfCheck v1.0
author: Valters IT
date: 2024-07-01
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-37825
logsource:
    category: webserver
    product: iis
detection:
    selection:
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e/'
        cs-uri-stem|contains:
            - '/SelfCheck/'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-37825 Directory Traversal Attempt"; flow:to_server,established; content:"../"; http_uri; nocase; content:"SelfCheck"; http_uri; nocase; pcre:"/(\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e\/)/Ri"; reference:cve,2024-37825; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Apply the vendor patch: Upgrade to OneStop 3.2.0.27184 Hotfix May 2024 or later.
2. Virtual Patching: If immediate patching is not possible, deploy a WAF rule to block requests containing path traversal sequences (e.g., ../, ..\\, %2e%2e%2f).
3. Network Segmentation: Ensure the SelfCheck server is isolated from sensitive internal networks and the internet.

Long-Term Measures:

1. Input Validation: Implement strict input validation for all user-supplied parameters, especially those used in file operations.
2. Least Privilege: Run the web application with the minimum necessary file system permissions.
3. Regular Audits: Conduct regular security audits and penetration testing of web applications.
4. Monitoring: Enable detailed logging and monitoring for path traversal attempts.

Valters IT Signature: This report was generated by Valters IT DevSecOps & CTI Expert System. For further analysis or remediation support, contact your Valters IT representative.