CVE-2024-54036: Adobe Connect Stored XSS Vulnerability

CVE-2024-54036 Overview

CVE-2024-54036 is a stored Cross-Site Scripting (XSS) vulnerability affecting Adobe Connect, a widely used web conferencing software platform. This vulnerability allows attackers to inject malicious scripts into vulnerable form fields within the application. When victims browse to pages containing these compromised fields, malicious JavaScript executes in their browsers, potentially enabling session takeover and unauthorized access to sensitive meeting data.

Critical Impact

Successful exploitation enables attackers to hijack user sessions, steal authentication tokens, and access confidential meeting content. The stored nature of this XSS vulnerability means injected payloads persist and affect all users who view the compromised content.

Affected Products

• Adobe Connect version 12.6 and earlier
• Adobe Connect version 11.4.7 and earlier
• All Adobe Connect installations prior to the patched versions

Discovery Timeline

• 2024-12-10 - CVE-2024-54036 published to NVD
• 2025-01-15 - Last updated in NVD database

Technical Details for CVE-2024-54036

Vulnerability Analysis

This stored Cross-Site Scripting vulnerability exists due to improper input validation and output encoding in Adobe Connect's form field handling. Unlike reflected XSS, which requires victims to click malicious links, stored XSS persists within the application database, making it particularly dangerous in collaborative environments like Adobe Connect.

When user-supplied input is saved to form fields without proper sanitization, malicious JavaScript code becomes embedded in the application. Subsequently, any user who views pages containing these fields has the malicious script execute within their authenticated browser session. This can lead to session token theft, unauthorized actions performed on behalf of victims, and exfiltration of sensitive meeting content.

The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component to affect the victim's browser and potentially other resources accessible from that context.

Root Cause

The root cause is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). Adobe Connect fails to properly sanitize user-controlled input before storing it in form fields and subsequently fails to encode this content when rendering it back to users. This allows attackers to inject script tags or JavaScript event handlers that execute when the vulnerable content is displayed.

Attack Vector

This vulnerability is exploitable over the network and requires user interaction—victims must navigate to pages containing the malicious payload. No prior authentication is required for the attacker to inject the malicious content in some configurations, though the attack's impact depends on the privileges of the users who view the compromised content.

The attack flow typically follows this pattern: an attacker identifies vulnerable form fields within Adobe Connect, crafts JavaScript payloads designed to steal session cookies or perform actions on behalf of victims, submits these payloads through the vulnerable input mechanism, and then waits for legitimate users to view the compromised content. When victims access the affected pages, the stored payload executes within their browser context, allowing the attacker to capture session tokens or perform session hijacking attacks.

Detection Methods for CVE-2024-54036

Indicators of Compromise

• Unusual JavaScript content appearing in Adobe Connect form fields or meeting content areas
• Unexpected outbound connections from user browsers during Adobe Connect sessions
• Session cookies being transmitted to external or unauthorized domains
• Anomalous account activity following Adobe Connect meeting participation

Detection Strategies

• Implement web application firewalls (WAF) with XSS detection rulesets to identify and block malicious script injection attempts
• Monitor Adobe Connect audit logs for suspicious content submissions containing script tags or JavaScript event handlers
• Deploy endpoint detection solutions to identify browser-based attacks and unauthorized script execution
• Review network traffic for exfiltration attempts targeting session tokens or authentication data

Monitoring Recommendations

• Enable verbose logging in Adobe Connect to capture form field submissions and content modifications
• Configure Content Security Policy (CSP) headers to restrict script execution sources and report violations
• Implement real-time monitoring for JavaScript execution anomalies within Adobe Connect sessions
• Establish baseline behavior for user interactions and alert on deviations indicative of session hijacking

How to Mitigate CVE-2024-54036

Immediate Actions Required

• Upgrade Adobe Connect to the latest patched version as specified in Adobe Security Advisory APSB24-99
• Review existing meeting content and form fields for signs of malicious script injection
• Force re-authentication for all active Adobe Connect sessions following the update
• Implement Content Security Policy headers to limit script execution capabilities

Patch Information

Adobe has released security updates to address this vulnerability. Administrators should consult the Adobe Security Advisory APSB24-99 for specific patched version numbers and upgrade instructions. Organizations running Adobe Connect versions 12.6, 11.4.7, or earlier must apply the appropriate security updates immediately given the critical severity of this vulnerability.

Workarounds

• Implement strict Content Security Policy headers to prevent inline script execution until patches can be applied
• Restrict access to Adobe Connect form field editing capabilities to trusted users only
• Deploy web application firewall rules to filter common XSS payload patterns from user input
• Consider temporarily disabling vulnerable form features if business requirements allow

# Example Content Security Policy header configuration for mitigation
# Add to web server configuration or Adobe Connect proxy

# Apache configuration example
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';"

# Nginx configuration example
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';";