CVE-2024-38100 Overview
CVE-2024-38100 is an elevation of privilege vulnerability in Windows File Explorer affecting multiple supported versions of Windows Server. The flaw maps to [CWE-284] Improper Access Control and allows a local, authenticated attacker to gain higher privileges on the target system. Microsoft published the advisory on July 9, 2024 as part of its monthly security update cycle. The vulnerability carries a CVSS 3.1 base score of 7.8 and an EPSS probability of 30.76% (96.78th percentile), indicating elevated likelihood of exploitation relative to the broader CVE population.
Critical Impact
A successful exploit lets a low-privileged local user escalate to higher privileges on affected Windows Server hosts, compromising confidentiality, integrity, and availability of the system.
Affected Products
- Microsoft Windows Server 2016
- Microsoft Windows Server 2019
- Microsoft Windows Server 2022 (including 23H2)
Discovery Timeline
- 2024-07-09 - CVE-2024-38100 published to the National Vulnerability Database
- 2024-07-09 - Microsoft released a security patch via the Microsoft Security Update Guide
- 2024-11-21 - Last updated in the NVD database
Technical Details for CVE-2024-38100
Vulnerability Analysis
The vulnerability resides in Windows File Explorer (explorer.exe) and the related shell components that handle privileged operations on behalf of users. An authenticated attacker who can execute code on the host can abuse improper access control in File Explorer to perform actions in a higher-privileged security context. The attack vector is local, requires low privileges, and does not require user interaction. A successful exploit impacts confidentiality, integrity, and availability at the operating system level.
Root Cause
Microsoft classifies this issue under [CWE-284] Improper Access Control. File Explorer fails to adequately enforce access boundaries when handling specific shell operations, allowing a standard user to perform actions reserved for higher-privileged principals. Microsoft has not publicly released detailed root-cause analysis, and the vendor advisory remains the authoritative reference.
Attack Vector
An attacker must first obtain the ability to execute code on the target server as a low-privileged user. From that foothold, the attacker invokes the vulnerable File Explorer functionality to escalate privileges, potentially to SYSTEM or another higher-privileged context. Because the vulnerability is local-only, it is most relevant in multi-user server environments such as Remote Desktop Services hosts, Citrix servers, jump boxes, and terminal servers where untrusted users hold interactive sessions.
No public proof-of-concept exploit is listed in Exploit-DB, and the CVE is not currently tracked on the CISA Known Exploited Vulnerabilities catalog. Refer to the Microsoft Security Update Guide for vendor-confirmed technical details.
Detection Methods for CVE-2024-38100
Indicators of Compromise
- Unexpected child processes spawned by explorer.exe running under a higher-privileged token than the parent user session.
- Token manipulation events (Windows Event ID 4672, 4673, 4688) tied to interactive sessions of standard users.
- Creation or modification of files in protected directories such as C:\Windows\System32 originating from a non-administrator session.
Detection Strategies
- Monitor Sysmon Event ID 1 (Process Create) and Event ID 10 (Process Access) for anomalous interactions between explorer.exe and privileged processes.
- Hunt for shell extension or COM object loads from non-standard paths inside user-writable directories.
- Correlate elevation events (4672) with originating standard-user logons to surface privilege transitions that bypass UAC consent.
Monitoring Recommendations
- Enable command-line auditing and PowerShell script-block logging on all multi-user servers.
- Ship endpoint telemetry to a centralized analytics platform and apply behavioral rules for privilege escalation patterns.
- Audit local administrator group membership changes and scheduled task creation triggered by interactive sessions.
How to Mitigate CVE-2024-38100
Immediate Actions Required
- Apply the July 2024 Microsoft security updates referenced in the Microsoft Security Update Guide to all affected Windows Server 2016, 2019, and 2022 systems.
- Prioritize patching on multi-user hosts including Remote Desktop Services, Citrix, and jump servers where local attack surface is highest.
- Verify patch deployment via WSUS, SCCM, or Intune reporting and confirm hotfix presence with Get-HotFix.
Patch Information
Microsoft addressed CVE-2024-38100 in the July 9, 2024 Patch Tuesday release. Cumulative updates for each affected Windows Server version contain the fix. Administrators should consult the Microsoft Security Update Guide for the specific KB article applicable to their build and install the corresponding rollup.
Workarounds
- Restrict interactive and Remote Desktop logon rights on affected servers to trusted administrators until patches are applied.
- Enforce application control policies (Windows Defender Application Control, AppLocker) to limit which binaries low-privileged users can execute.
- Monitor and alert on privilege escalation telemetry as a compensating control where patching must be deferred.
# Verify the July 2024 cumulative update is installed on Windows Server
Get-HotFix | Where-Object { $_.InstalledOn -ge (Get-Date '2024-07-09') } | Sort-Object InstalledOn -Descending
# Enumerate users with interactive logon rights on a multi-user host
whoami /priv
net localgroup "Remote Desktop Users"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
