CVE-2022-29092: Dell SupportAssist Privilege Escalation Flaw

CVE-2022-29092 Overview

CVE-2022-29092 is a privilege escalation vulnerability affecting Dell SupportAssist Client Consumer versions 3.11.0 and prior, as well as Dell SupportAssist Client Commercial versions 3.2.0 and prior. This vulnerability allows a non-admin user to exploit a flaw in the application and gain administrative access to the system, potentially leading to complete system compromise.

Critical Impact

Non-privileged local users can exploit this vulnerability to escalate their privileges to administrator level, gaining full control over affected Dell systems.

Affected Products

• Dell SupportAssist for Home PCs (versions 3.11.0 and prior)
• Dell SupportAssist for Business PCs (versions 3.2.0 and prior)

Discovery Timeline

• 2022-06-10 - CVE-2022-29092 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-29092

Vulnerability Analysis

The vulnerability is classified under CWE-427 (Uncontrolled Search Path Element), which indicates that the application uses a search path that can be manipulated by an attacker to load malicious code. In this case, Dell SupportAssist Client does not properly validate or restrict the directories from which it loads executable components or libraries.

When the SupportAssist service runs with elevated privileges, it may search for and execute files from directories that a standard user can write to. This creates a classic privilege escalation scenario where an attacker with local access can place a malicious payload in a location where it will be loaded and executed by the privileged service.

Root Cause

The root cause of this vulnerability lies in the improper handling of search paths within the Dell SupportAssist Client application. The software fails to adequately restrict or validate the file paths when loading dynamic libraries or executable components. This allows attackers to hijack the DLL loading process by placing malicious files in user-writable directories that appear earlier in the search path than the legitimate system directories.

Attack Vector

This is a local privilege escalation attack that requires the attacker to have initial access to the system as a low-privileged user. The attack exploits the insecure search path behavior of the Dell SupportAssist service:

1. The attacker identifies writable directories that are searched by the SupportAssist service
2. A malicious DLL or executable is placed in the vulnerable search path location
3. When the SupportAssist service runs (typically with SYSTEM privileges), it loads the attacker's malicious code
4. The malicious code executes with the elevated privileges of the service, granting the attacker administrative access

The attack does not require user interaction beyond the initial local access, making it particularly dangerous in environments where users have physical access to Dell systems running vulnerable SupportAssist versions.

Detection Methods for CVE-2022-29092

Indicators of Compromise

• Unexpected DLL files appearing in user-writable directories along Dell SupportAssist search paths
• Unusual process execution originating from SupportAssist.exe or related Dell service processes
• New administrative accounts created without authorization
• Modified system files or configurations associated with privilege escalation attempts

Detection Strategies

• Monitor for DLL loading events from non-standard directories by the Dell SupportAssist service using endpoint detection and response (EDR) solutions
• Implement application whitelisting to prevent unauthorized executables from running in the context of the SupportAssist service
• Configure alerts for privilege escalation indicators such as token manipulation or impersonation activities associated with Dell processes

Monitoring Recommendations

• Enable detailed Windows Security Event logging, particularly Event IDs related to process creation (4688) and privilege use (4672, 4673)
• Deploy SentinelOne Singularity platform to monitor for behavioral indicators of privilege escalation attempts targeting Dell SupportAssist
• Regularly audit installed versions of Dell SupportAssist across your environment to identify vulnerable installations

How to Mitigate CVE-2022-29092

Immediate Actions Required

• Update Dell SupportAssist for Home PCs to version 3.11.1 or later immediately
• Update Dell SupportAssist for Business PCs to version 3.2.1 or later immediately
• Audit all Dell systems in your environment to identify vulnerable SupportAssist installations
• Restrict local user permissions where feasible to limit potential exploitation vectors

Patch Information

Dell has released security updates addressing this vulnerability in DSA-2022-139. Administrators should download and apply the latest versions of Dell SupportAssist from the official Dell support website. Detailed patch information and download links are available in the Dell Security Update DSA-2022-139.

Workarounds

• If immediate patching is not possible, consider temporarily disabling the Dell SupportAssist service until updates can be applied
• Implement strict file system permissions on directories in the SupportAssist search path to prevent unauthorized file placement
• Use Windows Software Restriction Policies or AppLocker to block execution of unauthorized binaries in vulnerable paths
• Deploy endpoint protection solutions like SentinelOne to detect and block privilege escalation attempts in real-time