CVE-2024-38305: Dell SupportAssist Privilege Escalation

CVE-2024-38305 Overview

CVE-2024-38305 is a privilege escalation vulnerability affecting Dell SupportAssist for Home PCs Installer version 4.0.3. The vulnerability exists within the installer component and allows a local low-privileged authenticated attacker to exploit insecure search path handling, potentially leading to the execution of arbitrary executables on the operating system with elevated privileges.

This vulnerability is classified as CWE-426 (Untrusted Search Path), which occurs when an application searches for critical resources using an externally-supplied search path that can be controlled by an attacker to point to malicious resources.

Critical Impact

A local attacker with low privileges can escalate to elevated system privileges by exploiting the installer's untrusted search path, enabling execution of arbitrary code with administrative rights.

Affected Products

• Dell SupportAssist for Home PCs version 4.0.3

Discovery Timeline

• August 21, 2024 - CVE-2024-38305 published to NVD
• November 25, 2024 - Last updated in NVD database

Technical Details for CVE-2024-38305

Vulnerability Analysis

This vulnerability stems from an untrusted search path weakness in the Dell SupportAssist for Home PCs installer executable. When the installer runs with elevated privileges (typically during software installation), it searches for required DLLs or executables in directories that may be writable by low-privileged users.

The local attack vector requires user interaction, as the victim must execute the vulnerable installer while malicious files are present in an accessible search path location. Upon successful exploitation, an attacker can achieve high impact across confidentiality, integrity, and availability dimensions—gaining the ability to read sensitive data, modify system files, and potentially disrupt system operations.

Root Cause

The root cause is CWE-426 (Untrusted Search Path). The Dell SupportAssist installer does not properly validate or restrict the directories from which it loads executable components. This allows an attacker to place a malicious executable or DLL in a location that the installer will search before reaching the legitimate system directories.

During the installation process, when the installer attempts to load a required component, it may inadvertently load the attacker's malicious file instead of the legitimate one. Since the installer typically runs with elevated privileges, the malicious code executes with those same elevated privileges.

Attack Vector

The attack requires local access to the target system and proceeds as follows:

1. The attacker identifies writable directories in the installer's search path that are checked before trusted system directories
2. A malicious executable or DLL is placed in one of these writable directories, named to match a component the installer expects to load
3. The attacker waits for (or socially engineers) an administrator or user to run the vulnerable Dell SupportAssist installer
4. When the installer executes and searches for its dependencies, it loads the attacker's malicious file
5. The malicious code executes with the elevated privileges of the installer process

This attack technique is commonly known as DLL hijacking or search order hijacking when the targeted component is a dynamic-link library.

Detection Methods for CVE-2024-38305

Indicators of Compromise

• Unexpected DLL or executable files appearing in user-writable directories along common search paths (e.g., the current working directory, user profile directories)
• Process execution anomalies where SupportAssistInstaller.exe spawns unexpected child processes
• File system modifications in directories typically used for DLL hijacking attacks during Dell SupportAssist installation

Detection Strategies

• Monitor for file creation events in directories commonly abused for search path attacks, particularly when Dell SupportAssist installation is scheduled or in progress
• Implement application whitelisting to detect unsigned or unexpected executables being loaded by the Dell SupportAssist installer
• Use endpoint detection and response (EDR) solutions to identify privilege escalation patterns where low-privileged users trigger high-privileged process creation

Monitoring Recommendations

• Enable detailed process creation auditing to capture parent-child process relationships during software installations
• Configure file integrity monitoring on directories commonly used in DLL hijacking attacks
• Alert on any new executable files created in user-writable directories by accounts with limited privileges

How to Mitigate CVE-2024-38305

Immediate Actions Required

• Download and use the updated Dell SupportAssist for Home PCs installer from Dell's official support website
• Verify the integrity of any Dell SupportAssist installer files before execution using Dell's published checksums
• Ensure installations are performed from clean, trusted directories with restricted write permissions
• Review systems where the vulnerable version 4.0.3 may have been used for signs of compromise

Patch Information

Dell has released a security update addressing this vulnerability. Refer to the Dell Security Update Advisory (DSA-2024-312) for the updated installer version and download instructions.

Organizations should ensure they obtain the latest Dell SupportAssist for Home PCs installer directly from Dell's official support channels to receive the patched version.

Workarounds

• Run installations from directories with restricted write access (e.g., protected system directories) where only administrators can modify files
• Clear or audit the current working directory and user-writable PATH directories before running the installer
• Temporarily restrict user write access to common DLL hijacking target directories during installation procedures
• Use application control solutions to block unauthorized executable loading during the installation process