CVE-2023-3722: Avaya Aura Device Services RCE Flaw

CVE-2023-3722 Overview

An OS command injection vulnerability exists in the Avaya Aura Device Services Web application that could allow unauthenticated remote attackers to execute arbitrary operating system commands as the Web server user. The vulnerability is triggered through a malicious file upload mechanism, enabling complete system compromise without requiring any user interaction or authentication.

Critical Impact

This vulnerability allows unauthenticated remote code execution on affected Avaya Aura Device Services deployments, potentially leading to complete system compromise, data exfiltration, and lateral movement within enterprise communication infrastructure.

Affected Products

• Avaya Aura Device Services version 8.1.4.0 and earlier
• All deployments of Avaya Aura Device Services Web application with file upload functionality exposed

Discovery Timeline

• 2023-07-19 - CVE-2023-3722 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-3722

Vulnerability Analysis

The vulnerability resides in the file upload handling mechanism of the Avaya Aura Device Services Web application. When processing uploaded files, the application fails to properly sanitize user-controlled input before incorporating it into operating system commands. This lack of input validation creates a command injection vector that attackers can exploit to execute arbitrary commands with the privileges of the Web server user.

The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type), indicating that the application does not adequately restrict the types of files that can be uploaded or fails to properly validate file contents before processing them in a security-sensitive context.

Root Cause

The root cause of this vulnerability stems from improper input validation and sanitization in the file upload processing logic. The application appears to use user-supplied data from uploaded files—potentially the filename, file contents, or associated metadata—in the construction of system commands without adequate escaping or validation. This allows specially crafted malicious files to inject arbitrary OS commands that are subsequently executed by the server.

Attack Vector

Exploitation of this vulnerability follows a network-based attack pattern requiring no authentication or user interaction:

1. An attacker identifies an exposed Avaya Aura Device Services Web application
2. The attacker crafts a malicious file with command injection payloads embedded in the filename or file contents
3. The file is uploaded through the vulnerable file upload endpoint
4. The server processes the uploaded file, inadvertently executing the injected commands
5. The attacker achieves command execution with the privileges of the Web server process

The vulnerability is exploitable remotely over the network, and successful exploitation grants attackers the ability to execute commands, install backdoors, exfiltrate data, or pivot to other systems within the network. Given the role of Avaya Aura Device Services in enterprise communication infrastructure, compromised systems could provide access to sensitive voice communications and connected telephony systems.

Detection Methods for CVE-2023-3722

Indicators of Compromise

• Unusual file uploads to the Avaya Aura Device Services Web application, particularly files with suspicious characters in filenames (;, |, $(), backticks)
• Unexpected child processes spawned by the Web server process (e.g., sh, bash, cmd.exe, powershell)
• Outbound network connections from the Web server to unknown external IP addresses
• Web server logs showing file upload requests with anomalous parameters or encoding

Detection Strategies

• Deploy web application firewalls (WAF) with rules to detect command injection patterns in file upload requests
• Implement file integrity monitoring on the Avaya Aura Device Services installation directories
• Monitor process execution chains for anomalous command execution originating from the Web server
• Analyze HTTP request logs for suspicious file upload activity targeting the Device Services application

Monitoring Recommendations

• Enable verbose logging on the Avaya Aura Device Services application and forward logs to a SIEM
• Configure alerts for any shell command execution by the Web server user account
• Monitor network traffic for command-and-control communication patterns from the affected server
• Implement endpoint detection and response (EDR) solutions to detect post-exploitation activity

How to Mitigate CVE-2023-3722

Immediate Actions Required

• Upgrade Avaya Aura Device Services to a patched version as specified in Avaya security documentation
• Restrict network access to the Avaya Aura Device Services Web application to trusted IP ranges only
• Implement web application firewall rules to filter malicious file upload attempts
• Disable or restrict the file upload functionality if not required for business operations

Patch Information

Avaya has released security documentation addressing this vulnerability. Administrators should consult the Avaya Documentation for official patch information and upgrade instructions. It is critical to apply the vendor-provided patches as soon as possible given the severity of this vulnerability and its network-exploitable nature without authentication requirements.

Workarounds

• Implement strict network segmentation to isolate Avaya Aura Device Services from untrusted networks
• Deploy a reverse proxy or WAF in front of the application with command injection detection rules
• Disable file upload functionality temporarily if business operations permit
• Apply IP-based access control lists to restrict access to the Web application interface

# Example network segmentation using iptables
# Restrict access to Avaya Device Services to internal management network only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP