Active Scanning: ESAFENET CDG 3 Document Management Weak Logins

Introduction

Security teams are currently observing active scanning campaigns targeting the ESAFENET CDG (Content Data Guard) Document Management System. According to recent intelligence from SANS ISC, threat actors are systematically probing these systems for weak logins and default credentials. While ESAFENET positions CDG as a secure document management and data leakage prevention (DLP) solution—primarily within the Chinese market—the product has a history of security shortcomings, including SQL Injection (SQLi) and Cross-Site Scripting (XSS).

The current wave of scanning focuses on authentication bypass. For a DLP solution, this is a catastrophic failure mode: a successful authentication bypass or brute force attack on a document guard system effectively turns the security control into a data exfiltration superhighway. Defenders must immediately identify ESAFENET CDG instances in their environment and audit their security posture.

Technical Analysis

Affected Product: ESAFENET CDG 3 (Content Data Guard) Target Sector: Enterprise (High prevalence in Chinese market segments, but found globally)

Attack Vector: Authentication Scanning & Default Credentials

The active threat involves automated scanners hunting for internet-facing or internal CDG 3 management interfaces. The attack chain typically follows this pattern:

Discovery: Scanners probe web servers for specific URI paths associated with the CDG login portal or management console (e.g., /cdg/, /login.jsp).
Enumeration: Once identified, the attacker attempts to enumerate the version and underlying framework.
Brute Force/Credential Stuffing: The scanner attempts to authenticate using default factory credentials (e.g., admin/admin, root/123456) or common weak passwords.
Exploitation: If successful, attackers gain administrative access to the document management repository. Given the historical context of SQLi and XSS in this product, there is a high probability that valid credentials could be combined with unpatched web vulnerabilities to achieve Remote Code Execution (RCE).

Exploitation Status

Scanning: Confirmed active scanning in the wild as of July 26, 2026.
Vulnerability Context: While no new 2025/2026 CVE is explicitly listed in this alert, the product is historically vulnerable to SQLi and XSS. The current activity leverages poor configuration (default passwords) rather than a specific new zero-day, though it may serve as a precursor to exploiting known older bugs.

Detection & Response

SIGMA Rules

The following Sigma rules detect web scanning activity targeting CDG URI patterns and potential SQL injection attempts against the application.

YAML

---
title: Potential ESAFENET CDG Web Scanning Activity
id: 8c4d2e10-1a3b-4f5c-9e0d-7a6b5c4d3e2f
status: experimental
description: Detects potential scanning or reconnaissance activity against ESAFENET CDG systems by identifying URI paths containing 'cdg' or 'esafenet' indicators.
references:
 - https://isc.sans.edu/diary/rss/33184
author: Security Arsenal
date: 2026/07/26
tags:
 - attack.reconnaissance
 - attack.t1595
logsource:
 category: webserver
detection:
 selection_uri:
   cs-uri-stem|contains:
     - 'cdg'
     - 'CDG'
 selection_scanner:
   sc-status:
     - 404
     - 403
     - 500
 condition: selection_uri and selection_scanner
falsepositives:
  - Legitimate user typo traffic
  - Internal monitoring probes
level: medium
---
title: Web Application SQL Injection Attempt on CDG
id: 9f5e3f21-2b4c-5d6a-0f1e-8b7c6d5e4f3a
status: experimental
description: Detects common SQL injection patterns within URI queries, which may target known historical SQLi vulnerabilities in document management systems.
references:
 - https://isc.sans.edu/diary/rss/33184
author: Security Arsenal
date: 2026/07/26
tags:
 - attack.initial_access
 - attack.t1190
logsource:
 category: webserver
detection:
 selection_sqli:
   cs-uri-query|contains:
     - 'UNION SELECT'
     - 'OR 1=1'
     - 'WAITFOR DELAY'
     - 'sleep('
   cs-uri-stem|contains: 'cdg'
 condition: selection_sqli
falsepositives:
  - Rarely legitimate; usually indicative of probing
level: high

KQL (Microsoft Sentinel / Defender)

Use this KQL query to hunt for failed login attempts or scanning activity against web servers hosting the CDG application. This assumes CEF or Syslog ingestion.

KQL — Microsoft Sentinel / Defender

// Hunt for ESAFENET CDG scanning and brute force indicators
CommonSecurityLog
| where DeviceVendor in ("Cisco", "Fortinet", "Palo Alto Networks", "Imperva")
| extend RequestURI = iff(isnotempty(CustomString1), CustomString1, "/") // Adjust field mapping based on your specific log source
| where RequestURI has "cdg" or RequestURI has "CDG"
| project TimeGenerated, DeviceName, SourceIP, DestinationIP, RequestURI, Activity, RequestMethod, DeviceAction
| where DeviceAction has "Deny" or DeviceAction has "Block" or Activity has "404" or Activity has "401"
| summarize count() by SourceIP, RequestURI, bin(TimeGenerated, 1h)
| where count_ > 10
| order by count_ desc

Velociraptor VQL

This VQL artifact hunts for suspicious process execution patterns on the web server host, specifically looking for command shells (cmd.exe, powershell, bash) spawned by the web server process (e.g., java.exe, tomcat, httpd), which would indicate successful exploitation beyond simple login scanning.

VQL — Velociraptor

-- Hunt for web server processes spawning shells (RCE indicator)
SELECT Parent.Name as ParentProcess, Parent.Pid as ParentPid, Name as ChildProcess, Pid, CommandLine, StartTime
FROM pslist()
LEFT JOIN pslist() AS Parent ON Parent.Pid = Ppid
WHERE Name IN ('cmd.exe', 'powershell.exe', 'pwsh.exe', 'bash', 'sh')
  AND Parent.Name IN ('java.exe', 'javaw.exe', 'tomcat', 'httpd', 'nginx', 'w3wp.exe')

Remediation Script (PowerShell)

This script assists Windows administrators in parsing IIS logs to identify if their server has been targeted by the recent scanning activity.

PowerShell

# Script to scan IIS Logs for ESAFENET CDG related scanning activity
# Requires Administrative Privileges to access log files

$LogPath = "C:\inetpub\logs\LogFiles\"
$TargetPattern = "cdg|CDG|esafenet"
$DaysToCheck = 7

Write-Host "[+] Initiating scan for ESAFENET CDG indicators in IIS Logs..." -ForegroundColor Cyan

$CutoffDate = (Get-Date).AddDays(-$DaysToCheck)

Get-ChildItem -Path $LogPath -Recurse -Filter "*.log" | 
ForEach-Object {
    $LogFile = $_.FullName
    # Parse log files manually for speed and flexibility
    Select-String -Path $LogFile -Pattern $TargetPattern | 
    Where-Object { 
        # Extract date from log line (Standard IIS format: YYYY-MM-DD)
        $Line = $_.Line
        if($Line -match "^\d{4}-\d{2}-\d{2}"){
            $LogDateStr = $Line.Split(' ')[0]
            try {
                $LogDate = [DateTime]::ParseExact($LogDateStr, "yyyy-MM-dd", [System.Globalization.CultureInfo]::InvariantCulture)
                $LogDate -ge $CutoffDate
            } catch {
                $false
            }
        } else {
            $false
        }
    } | 
    ForEach-Object {
        $Fields = $_.Line.Split(' ')
        [PSCustomObject]@{
            Date = $Fields[0]
            Time = $Fields[1]
            SourceIP = $Fields[8]
            URI = $Fields[4]
            HttpStatus = $Fields[10]
            UserAgent = $Fields[9]
        }
    }
} | Format-Table -AutoSize

Write-Host "[+] Scan complete. Review the table above for suspicious IPs and 404/401 status codes." -ForegroundColor Green

Remediation

Immediate Actions:

Audit Credentials: Immediately change all administrative passwords for ESAFENET CDG instances. Ensure they do not use factory defaults.
Network Isolation: If the DLP functionality permits, restrict access to the management interface via VPN or strict IP allow-listing. It should not be directly accessible from the open internet.
Apply Patches: Contact the vendor (ESAfenet) for the latest security patches addressing SQL Injection and XSS vulnerabilities. Prioritize patches that mitigate authentication bypass.
WAF Configuration: Update Web Application Firewall rules to block specific URI anomalies associated with CDG exploitation and to enforce strict rate limiting on login endpoints.

Long-term Hardening:

Implement Multi-Factor Authentication (MFA) for all administrative access.
Disable any unused default accounts or services within the CDG application.
Conduct a penetration test on the DLP solution to ensure it does not introduce vulnerabilities into the environment.

Related Resources

Security Arsenal Healthcare Cybersecurity AlertMonitor Platform Book a SOC Assessment healthcare Intel Hub