CVE-2023-23698: Dell Alienware Update Privilege Escalation

CVE-2023-23698 Overview

CVE-2023-23698 is a high-severity vulnerability affecting Dell Command | Update, Dell Update, and Alienware Update software. The vulnerability exists in the installer component due to an insecure operation on Windows Junction (symbolic link). A local malicious user may exploit this vulnerability to achieve arbitrary file deletion on the affected system, potentially leading to denial of service or enabling further attacks by removing critical security files.

Critical Impact

Local attackers can exploit improper handling of Windows junction points in Dell update utilities to delete arbitrary files on the system, potentially causing system instability or enabling privilege escalation through targeted file removal.

Affected Products

• Dell Command | Update versions before 4.6.0 and 4.7.1
• Dell Update versions before 4.6.0 and 4.7.1
• Alienware Update versions before 4.6.0 and 4.7.1

Discovery Timeline

• 2023-02-10 - CVE-2023-23698 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-23698

Vulnerability Analysis

This vulnerability is classified under CWE-1386 (Insecure Operation on Windows Junction / Mount Point). The flaw resides in the installer component of Dell's update utilities, which fail to properly validate or securely handle Windows junction points (also known as reparse points or symbolic links).

Windows junction points allow directories to reference other locations on the file system. When software performs file operations without properly checking for junction points, an attacker can redirect those operations to unintended locations. In this case, the installer performs file deletion operations that can be manipulated through junction point abuse.

The vulnerability requires local access to exploit, meaning an attacker must have some level of authenticated access to the target system. However, no user interaction is required once the attacker has established local access. The impact is significant as it allows high integrity and availability impact through arbitrary file deletion, though confidentiality remains unaffected.

Root Cause

The root cause of this vulnerability is the failure of the Dell update installer component to implement secure file operation practices when handling temporary directories or installation paths. The installer does not adequately verify that target paths are legitimate directories rather than junction points created by an attacker.

When the installer attempts to clean up temporary files or perform file management operations during the update process, it follows junction points blindly, allowing an attacker to redirect these deletion operations to critical system files or files belonging to other users.

Attack Vector

The attack vector is local, requiring the attacker to have local access to the system. The attacker creates a Windows junction point at a location where the Dell installer performs file operations. When the installer runs (either manually triggered or during scheduled updates), it follows the junction point and deletes files at the attacker-specified target location.

A typical exploitation scenario involves:

1. The attacker identifies a predictable location where the Dell installer writes or manages temporary files
2. The attacker replaces this location with a junction point targeting sensitive system files
3. When the installer attempts to clean up or delete files in the original location, the junction redirects the operation
4. Critical files at the junction target are deleted with the privileges of the installer process

This type of attack is commonly used to delete security software components, remove audit logs, or corrupt system files to create further exploitation opportunities.

Detection Methods for CVE-2023-23698

Indicators of Compromise

• Unexpected creation of junction points in Dell installer working directories or temp locations
• Missing system files or security software components after Dell update utility execution
• Event logs showing file deletions in unexpected directories during Dell update processes
• Presence of junction points in %ProgramData%\Dell or related update utility directories

Detection Strategies

• Monitor for creation of reparse points (junction points) using Windows Security Event ID 4663 with appropriate SACL configuration
• Implement file integrity monitoring on critical system directories to detect unauthorized deletions
• Use endpoint detection tools to alert on symlink or junction creation in software installation directories
• Audit Dell update utility execution and correlate with subsequent file system changes

Monitoring Recommendations

• Enable Windows Security Auditing for file system changes in Dell software directories
• Configure SentinelOne to monitor for suspicious junction point creation patterns
• Review system logs for unexpected file deletions coinciding with Dell update utility activity
• Monitor for process behavior anomalies during software installation and update operations

How to Mitigate CVE-2023-23698

Immediate Actions Required

• Update Dell Command | Update to version 4.6.0 or later, or version 4.7.1 or later
• Update Dell Update to version 4.6.0 or later, or version 4.7.1 or later
• Update Alienware Update to version 4.6.0 or later, or version 4.7.1 or later
• Review systems for signs of exploitation such as unexpected file deletions or junction points in installer directories

Patch Information

Dell has released patched versions addressing this vulnerability. Organizations should update to Dell Command | Update, Dell Update, or Alienware Update version 4.6.0 or 4.7.1 and later. Detailed patch information and download links are available in the Dell Security Advisory DSA-2023-031.

Workarounds

• Restrict local user permissions to prevent creation of junction points in sensitive directories
• Implement application whitelisting to prevent unauthorized execution of tools that can create junction points
• Use filesystem permissions to protect directories used by Dell update utilities from modification by unprivileged users
• Consider temporarily disabling automatic Dell updates until patching can be completed in high-risk environments

# Check installed Dell Command Update version via PowerShell
Get-ItemProperty "HKLM:\SOFTWARE\Dell\UpdateService\Service" -ErrorAction SilentlyContinue | Select-Object -Property Version

# Alternative: Check via installed programs
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like "*Dell*Update*" } | Select-Object Name, Version