CVE-2023-35971: Arubanetworks ArubaOS XSS Vulnerability

CVE-2023-35971 Overview

A stored cross-site scripting (XSS) vulnerability exists in the ArubaOS web-based management interface that could allow an unauthenticated remote attacker to inject and execute malicious scripts. The vulnerability stems from improper input validation in the web management interface, enabling attackers to store malicious script code that executes in the context of authenticated users' browser sessions when they access the affected interface.

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in victims' browsers, potentially leading to session hijacking, credential theft, or unauthorized administrative actions on ArubaOS network devices.

Affected Products

• ArubaNetworks ArubaOS (multiple versions)
• ArubaNetworks MC-VA Series (MC-VA-10, MC-VA-1K, MC-VA-250, MC-VA-50)
• ArubaNetworks MCR-VA Series (MCR-VA-10K, MCR-VA-1K, MCR-VA-50, MCR-VA-500, MCR-VA-5K)
• ArubaNetworks MCR-HW Series (MCR-HW-10K, MCR-HW-1K, MCR-HW-5K)
• ArubaNetworks SD-WAN

Discovery Timeline

• July 5, 2023 - CVE-2023-35971 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-35971

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The stored XSS variant is particularly dangerous because the malicious payload persists on the server and affects any user who subsequently views the compromised page.

The attack requires no authentication to inject the malicious payload but does require user interaction—a victim with access to the management interface must view the page containing the stored malicious script. When triggered, the script executes with the full privileges of the victim's session, allowing the attacker to perform actions on behalf of authenticated administrators.

The scope is changed in this vulnerability, meaning the vulnerable component (the web interface) and the impacted component (the victim's browser) are different. This allows for potential lateral movement from the network device management plane to the administrator's workstation.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and output encoding in the ArubaOS web-based management interface. User-controlled input is stored in the application without proper validation and is later rendered in web pages without adequate encoding, allowing HTML and JavaScript code to be interpreted and executed by the browser.

Attack Vector

The attack is network-based and can be conducted by an unauthenticated remote attacker. The exploitation flow involves:

1. The attacker identifies input fields in the ArubaOS web management interface that accept and store user input
2. Malicious JavaScript payload is crafted and submitted to the vulnerable endpoint
3. The payload is stored in the application's backend without proper sanitization
4. When an authenticated administrator accesses the page containing the stored payload, the malicious script executes in their browser
5. The script can then steal session cookies, perform administrative actions, or redirect users to malicious sites

The vulnerability requires user interaction (the victim must view the affected page) but requires no prior authentication from the attacker, making it exploitable by external threat actors who can reach the management interface.

Detection Methods for CVE-2023-35971

Indicators of Compromise

• Unexpected JavaScript or HTML tags appearing in ArubaOS management interface database fields or logs
• Unusual network requests from administrator workstations to external domains after accessing the management interface
• Session cookie exfiltration attempts visible in network traffic analysis
• Administrator reports of unexpected pop-ups or redirects when using the web management interface

Detection Strategies

• Deploy web application firewalls (WAF) to detect and block XSS payloads targeting the ArubaOS management interface
• Monitor HTTP request logs for suspicious script tags, event handlers (onerror, onload), and encoded JavaScript patterns
• Implement Content Security Policy (CSP) headers to restrict script execution sources
• Use browser-based XSS auditors and security extensions for administrators accessing management interfaces

Monitoring Recommendations

• Enable verbose logging on ArubaOS devices to capture all management interface interactions
• Configure SIEM rules to alert on potential XSS payload patterns in web server logs
• Monitor for anomalous administrator session behavior that may indicate session hijacking
• Regularly audit stored data fields in the management interface for suspicious content

How to Mitigate CVE-2023-35971

Immediate Actions Required

• Apply the latest ArubaOS security patches as referenced in Aruba Networks Security Advisory ARUBA-PSA-2023-008
• Restrict access to the ArubaOS web management interface to trusted networks and IP addresses only
• Ensure administrators use modern browsers with built-in XSS protections enabled
• Implement network segmentation to limit exposure of management interfaces to potential attackers

Patch Information

Aruba Networks has released security patches addressing this vulnerability. Administrators should review the official Aruba Networks Security Advisory ARUBA-PSA-2023-008 for specific version information and upgrade instructions. The advisory provides detailed guidance on affected versions and corresponding patched releases for all impacted products including ArubaOS, MC-VA, MCR-VA, MCR-HW series, and SD-WAN appliances.

Workarounds

• Disable or restrict access to the web-based management interface and use CLI-based management where possible
• Implement strict access control lists (ACLs) to limit management interface access to specific administrator IP addresses
• Deploy a reverse proxy with XSS filtering capabilities in front of the management interface
• Use a dedicated, isolated management network for accessing ArubaOS device interfaces

# Example: Restrict management interface access using ACL (consult Aruba documentation for exact syntax)
# Limit web management access to trusted admin subnet only
ip access-list session mgmt-restrict
  permit tcp 10.0.100.0/24 any eq 443
  deny any any eq 443