0patch fixes LPE vulnerability (CVE-2021-24084) in Mobile Device Management Service

Windows[German]There is an unpatched Local Privilege Escalation vulnerability (CVE-2021-24084) in Windows Mobile Device Management Service. The vulnerability has been known since 2020, but has not yet been patched by Microsoft. ACROS Security has therefore developed a free 0patch solution to mitigate this vulnerability.


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The LPE vulnerability (CVE-2021-24084).

In June 2021, security researcher Abdelhamid Naceri published a blog post about an unpatched vulnerability in Windows that allows Information Disclosure. This flaw was first identified and reported to the Zero Day Initiative program in October 2020. The latter reported the flaw to Microsoft on October 27, 2020. The flaw was confirmed and a security advisory was published as CVE-2021-24084.

However, in November 2921, Abdelhamid pointed out that this unpatched bug may actually be a vulnerability that leads to local privilege escalation. Thus, an attacker could locally exploit the LPE vulnerability to gain administrator privileges.

The 0Patch solution for CVE-2021-24084

The team at ACROS Security, which has been providing the 0Patch solution for years, analyzed the LPE vulnerability CVE-2021-24084 and provided a micropatch to render the vulnerability harmless. Mitja Kolsek drew attention to this free solution via Twitter.

0Patch fix for CVE-2021-24084

The destails are described in this blog post from 0patch, dated on November 26, 2021. The 0patch micropatches are available for free for the following products:


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  • Windows 10 v21H1 (32 & 64 bit) updated with November 2021 Updates
  • Windows 10 v20H2 (32 & 64 bit) updated with November 2021 Updates
  • Windows 10 v2004 (32 & 64 bit) updated with November 2021 Updates
  • Windows 10 v1909 (32 & 64 bit) updated with November 2021 Updates
  • Windows 10 v1903 (32 & 64 bit) updated with November 2021 Updates
  • Windows 10 v1809 (32 & 64 bit) updated with May 2021 Updates

For notes on how the 0patch agent works, which loads micropatches into memory at an application's runtime, see blog posts (such as here).

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