CVE-2024-52942

Executive Summary

CVE-2024-52942 is a stored Cross-Site Scripting (XSS) vulnerability in Veritas Enterprise Vault, affecting versions prior to 15.1 UPD882911. An authenticated remote attacker can inject malicious parameters into HTTP requests, which are then reflected back to other authenticated users without proper sanitization when viewing archived content. This allows the attacker to execute arbitrary JavaScript in the context of the victim's session, potentially leading to data theft, session hijacking, or further compromise within the Enterprise Vault environment. The vulnerability was reported through ZDI (ZDI-CAN-24696) and has a CVSS score of 5.4 (Medium). No public exploit code or proof-of-concept is currently available, and the EPSS score is 0.0%, indicating low exploitation activity in the wild.

Supply Chain & Package Security

This vulnerability is not related to any open-source package (NPM, PyPI, Go, Ruby). It affects a proprietary enterprise software product, Veritas Enterprise Vault. The risk is limited to organizations that have deployed this software and have authenticated users.

CVSS Breakdown & Threat Level

• CVSS Score: 5.4 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
• Attack Vector (AV): Network (N) – The attack can be launched remotely.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): Low (L) – The attacker must have valid authentication credentials.
• User Interaction (UI): Required (R) – The victim must click on a crafted link or view malicious content.
• Scope (S): Changed (C) – The vulnerability impacts resources beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited ability to modify data.
• Availability (A): None (N) – No impact on availability.

Threat Level: Medium. While the CVSS score is moderate, the requirement for authentication and user interaction reduces the immediate risk. However, in environments where Enterprise Vault is used to archive sensitive data, the impact of successful exploitation could be significant.

Deep Dive & Mechanics

The vulnerability resides in the web interface of Veritas Enterprise Vault, which is used to view archived emails and files. The application fails to properly sanitize user-supplied input when constructing HTTP requests for viewing archived content. An authenticated attacker can craft a malicious URL or inject a parameter that, when processed by the server, is reflected back to the user's browser without proper encoding.

Attack Flow:

1. Authentication: The attacker must have valid credentials for the Enterprise Vault web interface.
2. Crafting Payload: The attacker creates a malicious link containing a JavaScript payload in a parameter (e.g., ?param=<script>alert('XSS')</script>).
3. Delivery: The attacker sends this link to a victim (e.g., via email or social engineering) or embeds it in a shared archive item.
4. Execution: When the victim clicks the link or views the malicious content, the server reflects the payload in the response, and the victim's browser executes the JavaScript.
5. Impact: The attacker can steal session cookies, perform actions on behalf of the victim, or exfiltrate sensitive data displayed in the archive.

The root cause is a lack of output encoding or input validation in the server-side code that handles archived content display. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation).

Vulnerable vs. Patched Code

Since the exact source code is proprietary, the following is a conceptual comparison based on the vulnerability type.

Vulnerable Code (Conceptual):

# Vulnerable: Directly reflects user input without sanitization
def view_archive(request):
    param = request.GET.get('param')
    # ... fetch archive content ...
    response = "<html><body>" + param + "</body></html>"
    return response

Patched Code (Conceptual):

# Patched: Input is sanitized/encoded before reflection
import html

def view_archive(request):
    param = request.GET.get('param')
    safe_param = html.escape(param)  # Encode HTML entities
    # ... fetch archive content ...
    response = "<html><body>" + safe_param + "</body></html>"
    return response

The patch (UPD882911) likely implements proper output encoding for all user-controlled parameters in the archive viewing functionality.

Exploitation & Lab Setup

Red Team (Attacker)

Prerequisites:

• Valid credentials for Enterprise Vault web interface.
• Network access to the Enterprise Vault server.
• A victim user who will click the crafted link.

Exploitation Steps:

1. Identify the vulnerable parameter: Use a web proxy (e.g., Burp Suite) to intercept requests when viewing an archived item. Look for parameters that are reflected in the response.
2. Craft the payload: Create a URL with a JavaScript payload. Example:

   https://enterprise-vault.example.com/ViewArchive?item=123&param=<script>alert(document.cookie)</script>
   

3. Deliver the link: Send the crafted URL to the victim via email or embed it in a shared archive.
4. Execute: When the victim clicks the link, the script executes in their browser.

No public exploit code is available. The above is a generic example.

Blue Team (Defender)

Detection:

• Monitor web server logs for unusual parameters containing <script>, onerror, onload, or other XSS patterns.
• Use a Web Application Firewall (WAF) to block common XSS payloads.
• Implement Content Security Policy (CSP) headers to restrict script execution.

Mitigation:

• Apply the vendor patch (UPD882911) immediately.
• Restrict access to the Enterprise Vault web interface to trusted networks.
• Enforce multi-factor authentication (MFA) for all users.
• Conduct regular security awareness training to prevent users from clicking suspicious links.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests containing <script> tags or JavaScript event handlers in parameters.
  • Unusual referrer headers from external domains.
  • Repeated requests to the same archive item with varying parameters.
• Host IOCs:
  • Unexpected JavaScript execution in the browser when viewing archived content.
  • Unauthorized cookie theft or session hijacking.
• Log IOCs:
  • Web server logs showing requests with encoded or obfuscated XSS payloads.
  • Authentication logs showing multiple failed login attempts followed by successful exploitation.

Detection Engineering

YARA Rule

rule Detect_XSS_Payload_in_Enterprise_Vault {
    meta:
        description = "Detects potential XSS payloads in HTTP requests to Veritas Enterprise Vault"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-52942"
    strings:
        $xss1 = /<script[^>]*>/i
        $xss2 = /onerror\s*=/i
        $xss3 = /onload\s*=/i
        $xss4 = /javascript\s*:/i
        $xss5 = /alert\s*\(/i
    condition:
        any of ($xss*) and filesize < 10KB
}

Sigma Rule

title: XSS Attempt Against Veritas Enterprise Vault
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects potential XSS payloads in HTTP requests to Enterprise Vault
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'onload='
            - 'javascript:'
            - 'alert('
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in archived content (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-52942 XSS Attempt in Veritas Enterprise Vault"; flow:to_server,established; content:"GET"; http_method; content:"/ViewArchive"; http_uri; pcre:"/(<script|onerror|onload|javascript:|alert\()/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Apply the vendor patch (UPD882911) to all affected Enterprise Vault installations. This is the only complete fix.
2. Workaround: If patching is not immediately possible, restrict access to the web interface using network segmentation and firewall rules. Only allow trusted IP addresses.
3. Web Application Firewall (WAF): Deploy a WAF with rules to block common XSS patterns.
4. Input Validation: Implement server-side input validation and output encoding for all user-controlled parameters.
5. User Training: Educate users about the risks of clicking suspicious links, especially those related to archived content.
6. Monitoring: Enable detailed logging and monitor for XSS attempts using the detection rules provided above.

Report generated by Valters IT DevSecOps & CTI Division. For internal use only.