CVE-2023-48670: Dell SupportAssist Privilege Escalation

CVE-2023-48670 Overview

Dell SupportAssist for Home PCs version 3.14.1 and prior versions contain a privilege escalation vulnerability in the installer component. A local low-privileged authenticated attacker may potentially exploit this vulnerability, leading to the execution of arbitrary executables on the operating system with elevated privileges. This vulnerability is classified under CWE-426 (Untrusted Search Path), indicating that the installer improperly handles DLL or executable search paths during installation.

Critical Impact

Local attackers with low privileges can escalate to elevated system privileges through the vulnerable installer, potentially gaining complete control over affected Dell systems.

Affected Products

• Dell SupportAssist for Home PCs version 3.14.1 and earlier
• Dell SupportAssist for Home PCs version 3.14.2.45116
• Dell SupportAssist installer components for Home PC variants

Discovery Timeline

• 2023-12-22 - CVE-2023-48670 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-48670

Vulnerability Analysis

This privilege escalation vulnerability exists within the Dell SupportAssist for Home PCs installer. The flaw stems from an untrusted search path weakness (CWE-426) where the installer does not properly validate or restrict the locations from which it loads dynamic-link libraries (DLLs) or executables during the installation process.

When the installer executes, it searches for required DLLs in directories that may be writable by low-privileged users. An attacker can place a malicious DLL in one of these search path locations before the legitimate installation process runs. When the installer subsequently loads the malicious DLL instead of the legitimate one, the attacker's code executes with the elevated privileges of the installation process.

The attack requires local access and a low-privileged account on the target system. The attacker must be able to write files to directories that are included in the DLL search path before the victim runs the installer. This type of attack is commonly known as DLL hijacking or DLL search order hijacking.

Root Cause

The root cause of CVE-2023-48670 is an untrusted search path vulnerability (CWE-426) in the Dell SupportAssist for Home PCs installer. The installer does not properly specify absolute paths for required libraries or validate that loaded components originate from trusted locations. This allows local attackers to inject malicious code into the installation process by placing crafted DLLs in directories that are searched before the legitimate system directories.

Attack Vector

The attack vector is local, requiring the attacker to have an authenticated session on the target system with low-level privileges. The exploitation follows a DLL hijacking pattern:

1. The attacker identifies writable directories in the installer's DLL search path
2. A malicious DLL with the same name as a legitimately required library is placed in the writable location
3. When a user or administrator runs the Dell SupportAssist installer, it loads the malicious DLL
4. The attacker's code executes with the elevated privileges of the installation process
5. This enables the attacker to execute arbitrary code with system-level permissions

Since this is a local privilege escalation vulnerability with no verified code examples available, the attack mechanism relies on exploiting the Windows DLL search order. The attacker crafts a malicious DLL that exports the same functions as a legitimate DLL required by the installer and places it in a location that is searched before trusted system directories. For detailed technical information, refer to the Dell Security Update Advisory.

Detection Methods for CVE-2023-48670

Indicators of Compromise

• Presence of unexpected DLL files in directories where the Dell SupportAssist installer is executed
• New or modified DLL files in user-writable directories that match names of system or application libraries
• Process execution logs showing Dell SupportAssist installer loading DLLs from non-standard locations
• Evidence of privilege escalation attempts from low-privileged user accounts

Detection Strategies

• Monitor file creation events in common DLL hijacking directories such as %TEMP%, %USERPROFILE%\Downloads, and application installation paths
• Implement application whitelisting to prevent execution of unauthorized executables during installation processes
• Use endpoint detection tools to identify suspicious DLL loading patterns during software installations
• Enable Windows Security auditing to log DLL load events and process creation with command-line arguments

Monitoring Recommendations

• Deploy SentinelOne Singularity to detect and prevent privilege escalation attempts through behavioral analysis
• Configure alerts for any attempts to load unsigned or suspicious DLLs during installation processes
• Monitor for unexpected child processes spawned by Dell SupportAssist installer components
• Review endpoint logs for evidence of DLL sideloading or search order hijacking techniques

How to Mitigate CVE-2023-48670

Immediate Actions Required

• Update Dell SupportAssist for Home PCs to the latest patched version immediately
• Verify all Dell SupportAssist installations are running version 3.14.2 or later with the security fix applied
• Download installers only from official Dell sources and verify file integrity before execution
• Restrict write permissions on directories commonly used for DLL hijacking attacks

Patch Information

Dell has released a security update to address this privilege escalation vulnerability. Affected users should update to the latest version of Dell SupportAssist for Home PCs. The security advisory DSA-2023-468 provides detailed information about the patched versions. Users can obtain the update through the Dell Security Update Advisory or through Dell's automatic update mechanism.

Workarounds

• Run the Dell SupportAssist installer only from protected directories such as C:\Windows\Temp with restricted write permissions
• Clear temporary directories and download folders before running the installer to remove any potentially malicious DLLs
• Use application control policies to restrict which DLLs can be loaded during installation processes
• Consider uninstalling Dell SupportAssist until the patched version can be deployed if immediate updating is not possible

# Verify Dell SupportAssist version (PowerShell)
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*Dell SupportAssist*"} | Select-Object Name, Version
# If version is below 3.14.2, update immediately via Dell's official download portal