CVE-2024-54034: Adobe Connect Reflected XSS Vulnerability

CVE-2024-54034 Overview

CVE-2024-54034 is a reflected Cross-Site Scripting (XSS) vulnerability affecting Adobe Connect, a widely-used web conferencing platform. The vulnerability allows an attacker to execute malicious JavaScript content within the context of a victim's browser by convincing them to visit a specially crafted URL that references a vulnerable page. Successful exploitation can lead to session takeover, significantly impacting confidentiality and integrity of user sessions.

Critical Impact

Attackers can achieve complete session takeover through reflected XSS, enabling unauthorized access to sensitive meeting data, user credentials, and potentially administrative functions within Adobe Connect environments.

Affected Products

• Adobe Connect version 12.6 and earlier
• Adobe Connect version 11.4.7 and earlier
• All prior versions of Adobe Connect

Discovery Timeline

• 2024-12-10 - CVE-2024-54034 published to NVD
• 2025-01-21 - Last updated in NVD database

Technical Details for CVE-2024-54034

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) exists in Adobe Connect's web application layer where user-supplied input is improperly sanitized before being reflected back in HTTP responses. The attack requires user interaction, specifically convincing a victim to click on a malicious URL. Once executed, the injected JavaScript runs with the same privileges as the legitimate application, allowing the attacker to hijack active sessions, steal authentication tokens, and perform actions on behalf of the victim.

The scope is changed (S:C in the CVSS vector), meaning the vulnerability can affect resources beyond its security scope. This cross-scope impact combined with high confidentiality and integrity impact makes this vulnerability particularly dangerous for enterprise deployments of Adobe Connect.

Root Cause

The root cause is improper neutralization of user input in Adobe Connect's web interface. When user-controlled data is included in dynamically generated web pages without adequate encoding or validation, attackers can inject arbitrary script content. The application fails to properly escape special characters that have meaning in HTML/JavaScript contexts, allowing script injection through reflected parameters.

Attack Vector

The attack leverages a network-based vector where an attacker crafts a malicious URL containing XSS payload targeting vulnerable Adobe Connect instances. The attack flow typically involves:

1. Attacker identifies a vulnerable parameter in Adobe Connect that reflects user input
2. Attacker constructs a malicious URL with embedded JavaScript payload
3. Attacker delivers the URL to victims through phishing emails, social engineering, or malicious websites
4. When the victim clicks the link while authenticated to Adobe Connect, the malicious script executes
5. The script can exfiltrate session cookies, perform actions as the user, or redirect to credential harvesting pages

Due to the session takeover capability, attackers can gain full access to the victim's Adobe Connect account, potentially accessing sensitive meeting recordings, documents, and participant information.

Detection Methods for CVE-2024-54034

Indicators of Compromise

• Unusual URL patterns in Adobe Connect access logs containing encoded script characters (e.g., %3Cscript%3E, javascript:, onerror=)
• Unexpected session activity or logins from unusual geographic locations following link clicks
• Reports from users of unexpected behavior after clicking links to Adobe Connect

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common XSS payload patterns in URLs targeting Adobe Connect endpoints
• Monitor Adobe Connect access logs for requests containing suspicious query string parameters with script-like content
• Deploy browser security controls and Content Security Policy (CSP) headers to mitigate script execution from untrusted sources

Monitoring Recommendations

• Enable detailed logging for Adobe Connect web servers to capture full request URLs and parameters
• Configure SIEM alerts for high volumes of 4xx/5xx responses that may indicate exploitation attempts
• Monitor for session anomalies such as rapid session token changes or sessions originating from multiple IP addresses

How to Mitigate CVE-2024-54034

Immediate Actions Required

• Update Adobe Connect to the latest patched version as specified in Adobe Security Bulletin APSB24-99
• Review recent access logs for signs of exploitation attempts or compromised sessions
• Educate users about the risks of clicking untrusted links, especially those leading to Adobe Connect
• Consider implementing additional Content Security Policy headers if not already in place

Patch Information

Adobe has released security updates addressing this vulnerability. Administrators should apply the patches referenced in Adobe Security Advisory APSB24-99. The update addresses the improper input validation that enables the reflected XSS attack.

Organizations running Adobe Connect 12.6 or earlier should upgrade to the latest available version. Those on version 11.4.7 or earlier in the 11.x branch should also apply the appropriate security update per Adobe's guidance.

Workarounds

• Implement strict Content Security Policy (CSP) headers to prevent inline script execution
• Deploy a web application firewall (WAF) with XSS detection rules in front of Adobe Connect servers
• Restrict Adobe Connect access to trusted networks or VPN-only access until patching is complete
• Train users to verify URLs before clicking and to access Adobe Connect only through bookmarked trusted URLs

# Example CSP header configuration for Apache
# Add to Adobe Connect's Apache configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self'"