CVE-2023-46808: Ivanti Neurons for ITSM RCE Vulnerability

CVE-2023-46808 Overview

CVE-2023-46808 is a critical file upload vulnerability affecting Ivanti Neurons for ITSM versions prior to 2023.4. This vulnerability allows an authenticated remote user to perform arbitrary file writes to the server, potentially leading to command execution in the context of a non-root user. The flaw is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type), indicating improper handling of file upload functionality within the application.

Critical Impact

Authenticated attackers can write arbitrary files to the server, enabling command execution and potential system compromise. While exploitation requires authentication, the ability to execute commands represents a severe security risk to enterprise ITSM environments.

Affected Products

• Ivanti Neurons for ITSM versions prior to 2023.4
• All cloud and on-premises deployments running vulnerable versions
• Enterprise ITSM environments using Ivanti's IT service management platform

Discovery Timeline

• 2024-03-31 - CVE-2023-46808 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-46808

Vulnerability Analysis

This file upload vulnerability in Ivanti Neurons for ITSM stems from inadequate validation of uploaded files, allowing authenticated users to write files to arbitrary locations on the server filesystem. The vulnerability is particularly dangerous because it enables remote code execution, albeit in the context of a non-root user. Attackers with valid credentials can leverage this flaw to upload malicious files that execute commands on the target system, potentially leading to lateral movement, data exfiltration, or further privilege escalation attacks.

The attack requires network access and low-privilege authentication to the ITSM platform. Once authenticated, the attacker can bypass normal file handling restrictions to place malicious payloads in executable locations. The scope of the vulnerability extends beyond the vulnerable component, as indicated by the changed scope characteristic, meaning successful exploitation can impact resources managed by other security authorities.

Root Cause

The root cause of CVE-2023-46808 is improper validation of file uploads within Ivanti Neurons for ITSM. The application fails to adequately sanitize or restrict the destination paths and file types during the upload process. This allows authenticated users to bypass intended restrictions and write files to unintended server locations. The vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), which typically occurs when applications do not properly validate file extensions, content types, or destination directories during file upload operations.

Attack Vector

The attack is conducted over the network and requires the attacker to have valid authentication credentials for the Ivanti Neurons for ITSM platform. The exploitation flow typically involves:

1. Authenticating to the Ivanti ITSM application with valid user credentials
2. Identifying vulnerable file upload endpoints within the application
3. Crafting a malicious request that bypasses path restrictions
4. Writing a malicious file to an executable or sensitive location on the server
5. Triggering execution of the uploaded file to achieve command execution

The vulnerability mechanism involves improper path validation during file upload operations. Attackers can manipulate file paths or filenames to write content outside of intended directories. This type of vulnerability often exploits path traversal sequences or insufficient checks on destination directories. For detailed technical information, refer to the Ivanti Security Advisory for CVE-2023-46808.

Detection Methods for CVE-2023-46808

Indicators of Compromise

• Unexpected file creation in web-accessible directories or system paths outside normal upload locations
• Unusual process spawning from web server processes (e.g., command shells initiated by the ITSM application)
• Authentication followed by abnormal file upload patterns or large numbers of upload requests
• Web server error logs showing path manipulation attempts or file write failures to restricted directories

Detection Strategies

• Monitor web application logs for file upload requests containing path traversal sequences such as ../ or absolute paths
• Implement file integrity monitoring (FIM) on critical system directories and application folders
• Analyze network traffic for suspicious POST requests to file upload endpoints with unusual payloads
• Deploy web application firewall (WAF) rules to detect and block path traversal attempts in upload requests

Monitoring Recommendations

• Enable detailed logging for all file upload operations within Ivanti Neurons for ITSM
• Configure alerts for new file creation events in sensitive directories on ITSM servers
• Monitor for process execution chains originating from the ITSM application's service account
• Implement user behavior analytics to detect anomalous authenticated user activities

How to Mitigate CVE-2023-46808

Immediate Actions Required

• Upgrade Ivanti Neurons for ITSM to version 2023.4 or later immediately
• Review authentication logs to identify any potentially compromised accounts with access to vulnerable instances
• Perform a forensic analysis of file systems on affected servers to identify any unauthorized file modifications
• Reset credentials for accounts that had access to vulnerable systems as a precautionary measure

Patch Information

Ivanti has released a security update addressing this vulnerability in Ivanti Neurons for ITSM version 2023.4 and later. Organizations should apply this update immediately to all affected deployments. For detailed patch information and upgrade instructions, consult the official Ivanti Security Advisory for CVE-2023-46808.

Workarounds

• Implement strict network segmentation to limit access to ITSM servers from untrusted network segments
• Apply principle of least privilege to user accounts, restricting file upload capabilities where possible
• Deploy web application firewall rules to block requests containing path traversal sequences
• Enable enhanced auditing and monitoring on ITSM servers until patching is complete

# Example: Restrict access to ITSM servers via firewall rules (adjust for your environment)
# Allow only trusted management networks to access ITSM web interface
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP