CVE-2024-35153: IBM WebSphere Application Server XSS Flaw

CVE-2024-35153 Overview

IBM WebSphere Application Server versions 8.5 and 9.0 contain a cross-site scripting (XSS) vulnerability that allows a privileged user to embed arbitrary JavaScript code in the Web UI. This vulnerability alters the intended functionality of the application, potentially leading to credentials disclosure within a trusted session.

Critical Impact

A privileged attacker can exploit this XSS vulnerability to inject malicious JavaScript into the WebSphere administrative console, potentially stealing credentials or performing actions on behalf of authenticated administrators within trusted sessions.

Affected Products

• IBM WebSphere Application Server 8.5
• IBM WebSphere Application Server 9.0

Discovery Timeline

• 2024-06-27 - CVE-2024-35153 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-35153

Vulnerability Analysis

This vulnerability is classified as a stored or reflected Cross-Site Scripting (XSS) flaw (CWE-79) within the IBM WebSphere Application Server Web UI. The vulnerability requires the attacker to have privileged access to the application, indicating it likely exists within administrative interfaces or restricted areas of the WebSphere console.

The attack requires user interaction, meaning a victim must navigate to or interact with a page containing the injected malicious script. Once triggered, the JavaScript executes within the context of the victim's authenticated session, potentially allowing the attacker to steal session cookies, credentials, or perform unauthorized administrative actions.

Root Cause

The root cause of this vulnerability is improper neutralization of user-supplied input before it is rendered in web page output. The WebSphere Application Server fails to properly sanitize or encode data submitted by privileged users, allowing malicious JavaScript payloads to be embedded and subsequently executed in the browsers of other users who view the affected content.

Attack Vector

The attack vector for CVE-2024-35153 is network-based, requiring no direct access to the vulnerable system. A privileged attacker can exploit this vulnerability remotely by:

1. Authenticating to the WebSphere Application Server Web UI with elevated privileges
2. Injecting malicious JavaScript code into a vulnerable input field or parameter
3. Waiting for another administrator or user to access the page containing the injected script
4. Harvesting credentials or session tokens when the victim's browser executes the malicious code

The vulnerability requires high privileges to exploit but can affect users with different security contexts, potentially escalating the attack impact.

Detection Methods for CVE-2024-35153

Indicators of Compromise

• Unusual JavaScript content or encoded script tags within WebSphere administrative console data fields
• Unexpected HTTP requests originating from the WebSphere console to external domains
• Session anomalies where administrative actions appear to originate from unexpected sources
• Browser developer console errors indicating blocked cross-origin requests or Content Security Policy violations

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payload patterns targeting WebSphere endpoints
• Enable detailed access logging on the WebSphere administrative console to track privileged user input submissions
• Deploy browser-based XSS auditing tools and monitor for blocked script execution attempts
• Review WebSphere application logs for suspicious input patterns containing HTML tags, JavaScript events, or encoded script content

Monitoring Recommendations

• Monitor administrative console access patterns for unusual activity from privileged accounts
• Implement Content Security Policy (CSP) headers and monitor violation reports for XSS attempts
• Track outbound network connections from client browsers during WebSphere console sessions
• Enable security information and event management (SIEM) correlation rules for XSS attack indicators

How to Mitigate CVE-2024-35153

Immediate Actions Required

• Apply the latest security patches from IBM for WebSphere Application Server versions 8.5 and 9.0
• Review and restrict administrative console access to only essential personnel
• Implement Content Security Policy (CSP) headers to mitigate XSS exploitation impact
• Audit privileged user accounts for any unauthorized or suspicious activity

Patch Information

IBM has released security updates to address this vulnerability. Organizations running affected versions of WebSphere Application Server should apply the patches detailed in the IBM Patch Information Advisory. Additional vulnerability details are available through the IBM X-Force Vulnerability #292640.

Workarounds

• Restrict administrative console access to trusted network segments or IP ranges using firewall rules
• Implement strict input validation on the network perimeter using a Web Application Firewall
• Enable and enforce Content Security Policy (CSP) headers with strict script-src directives
• Limit the number of users with privileged access to the WebSphere administrative interface
• Consider using browser-based XSS protection features and educate administrators about social engineering attacks

# Example: Configure network-level access restrictions for WebSphere admin console
# Add to firewall rules to limit admin console access
iptables -A INPUT -p tcp --dport 9043 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9043 -j DROP