CVE-2025-24998: Visual Studio 2017 Privilege Escalation

CVE-2025-24998 Overview

CVE-2025-24998 is a local privilege escalation vulnerability in Microsoft Visual Studio caused by an uncontrolled search path element [CWE-427]. An authorized attacker with local access can leverage the flaw to elevate privileges on affected systems. The vulnerability affects Visual Studio 2017, 2019, and 2022 across supported update channels. Microsoft published the advisory on March 11, 2025, and the issue requires user interaction to trigger successful exploitation.

Critical Impact

A local attacker with low privileges can execute code in the context of a higher-privileged user, resulting in full compromise of confidentiality, integrity, and availability on the affected host.

Affected Products

• Microsoft Visual Studio 2017
• Microsoft Visual Studio 2019
• Microsoft Visual Studio 2022

Discovery Timeline

• 2025-03-11 - CVE-2025-24998 published to NVD by Microsoft
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-24998

Vulnerability Analysis

CVE-2025-24998 stems from Visual Studio resolving one or more executable or library dependencies through an uncontrolled search path [CWE-427]. When Visual Studio launches a component, it searches directories in a specific order before locating the intended binary. If an attacker can plant a malicious file earlier in that search order, Visual Studio will load the attacker-controlled binary instead of the legitimate one.

Exploitation requires local access, low existing privileges, and user interaction such as launching the affected Visual Studio component. Successful exploitation results in code execution under the privileges of the user running Visual Studio, which is commonly a developer account with elevated permissions.

Root Cause

The root cause is improper control of the search path used to locate libraries or executables loaded by Visual Studio processes. The application does not enforce a fully qualified path or a trusted directory list when resolving specific dependencies. This behavior maps directly to CWE-427 (Uncontrolled Search Path Element), a common source of DLL hijacking and binary planting issues on Windows.

Attack Vector

An attacker with an existing low-privileged account places a malicious DLL or executable in a directory that appears earlier in the Visual Studio search path than the legitimate location. When a user with higher privileges subsequently invokes the vulnerable Visual Studio workflow, Windows loads the attacker's binary. The attacker then executes code in the target user's security context. Because Visual Studio is often run by developers or administrators, the escalation path frequently leads to sensitive source code, signing keys, and build infrastructure.

No public proof-of-concept exploit has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2025-24998

Indicators of Compromise

• Unexpected DLLs or executables written to directories in the PATH environment variable, user-writable application directories, or the current working directory of Visual Studio processes.
• devenv.exe or Visual Studio helper processes loading modules from non-standard locations such as %TEMP%, %APPDATA%, or user profile subdirectories.
• Child processes spawned by Visual Studio components running with elevated tokens shortly after a new binary appears on disk.

Detection Strategies

• Enable Windows Sysmon Event ID 7 (Image Loaded) and alert on Visual Studio processes loading modules from user-writable paths outside %ProgramFiles%\Microsoft Visual Studio.
• Correlate file creation events in Visual Studio installation-adjacent directories with subsequent module-load events for devenv.exe and related binaries.
• Hunt for unsigned or newly created DLLs loaded by Microsoft-signed Visual Studio processes.

Monitoring Recommendations

• Monitor for writes to PATH directories by non-administrative users and generate alerts when developer tools subsequently execute.
• Track new autoruns, scheduled tasks, or persistence mechanisms created in developer user contexts following Visual Studio activity.
• Baseline the module load behavior of Visual Studio in your environment and alert on deviations, particularly binaries not signed by Microsoft.

How to Mitigate CVE-2025-24998

Immediate Actions Required

• Apply the Microsoft security update referenced in the Microsoft Security Update CVE-2025-24998 advisory to all installations of Visual Studio 2017, 2019, and 2022.
• Inventory developer workstations and build servers to identify unpatched Visual Studio instances.
• Restrict local write access to directories that appear in Visual Studio process search paths.

Patch Information

Microsoft has released security updates addressing CVE-2025-24998 for Visual Studio 2017, 2019, and 2022. Refer to the Microsoft Security Update CVE-2025-24998 guide for the specific build numbers and update packages that apply to each supported version. Install updates through the Visual Studio Installer or your enterprise patch management platform.

Workarounds

• Enforce least privilege on developer accounts and prevent standard users from writing to directories that are searched by Visual Studio components.
• Apply Windows AppLocker or Windows Defender Application Control policies that block execution of unsigned binaries from user-writable locations.
• Remove non-essential entries from the system and user PATH variables, particularly writable directories that precede trusted system paths.

# Configuration example: audit user-writable directories in PATH on Windows
powershell -Command "$env:Path -split ';' | ForEach-Object { if (Test-Path $_) { $acl = Get-Acl $_; Write-Output ($_ + ' -> ' + ($acl.Access | Where-Object { $_.IdentityReference -match 'Users|Everyone' -and $_.FileSystemRights -match 'Write' } | Measure-Object).Count } }"