ShieldBreak Microsoft Defender RoguePlanet Patch-Bypass PoC

[carlospolop]

🤖 Automated Content Update

This PR was automatically generated by the HackTricks News Bot based on a technical blog post.

📝 Source Information

• Blog URL: https://github.com/MSNightmare/ShieldBreak
• Blog Title: ShieldBreak: Microsoft Defender RoguePlanet Patch-Bypass PoC
• Suggested Section: Windows Hardening > Windows Local Privilege Escalation > Microsoft Defender Remediation TOCTOU and Object Manager Link-Race Abuse

🎯 Content Summary

ShieldBreak is a public C++ proof of concept that the author describes as a complete patch bypass for RoguePlanet (CVE-2026-50656), a local elevation-of-privilege vulnerability in the Microsoft Malware Protection Engine used by Microsoft Defender. The underlying weakness is improper link resolution before file access (CWE-59): Defender's privileged remediation pipeline can be raced into resolving attacker-controlled links and writing attacker...

🔧 Technical Details

Cloud Files TOCTOU content substitution: register an attacker-controlled directory as a Cloud Files sync root and expose a placeholder whose first hydration returns benign or detection-triggering content. After a privileged scanner has classified that representation, submit CF_OPERATION_TYPE_RESTART_HYDRATION, update the placeholder metadata, and make the next CF_CALLBACK_TYPE_FETCH_DATACfRegisterSyncRoot, CfConnectSyncRoot, CfCreatePlaceholders, CfGetTransferKey, CfExecute, and CfHydratePlaceholder. This can break assumptions that a logical file's content remains stable between scanning, validation, and privileged remediation.

Object Manager shadow-directory path switching: create a target directory and a shadow directory with NtCreateDirectoryObjectEx, passing t...

🤖 Agent Actions

Updated:

src/windows-hardening/windows-local-privilege-escalation/kernel-race-condition-object-manager-slowdown.md

Added technical coverage of:

• Cloud Files hydration TOCTOU content substitution
• Object Manager shadow-directory path switching
• CLFS generated-name capture and locking
• Loopback administrative-share redirection
• ADS/SEC_IMAGE race stabilization
• WER QueueReporting conversion to SYSTEM execution
• Detection pivots

References include the ShieldBreak repository and commit-pinned source. git diff --check, structural citation checks, forbidden-source checks, and reference URL validation passed. mdbook was unavailable in the environment.

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📚 Repository Maintenance

• MD files processed: 988
• MD files fixed: 18

All .md files have been checked for proper formatting (headers, includes, etc.).

[carlospolop]

🔗 Additional Context

Original Blog Post: https://github.com/MSNightmare/ShieldBreak

Content Categories: Based on the analysis, this content was categorized under "Windows Hardening > Windows Local Privilege Escalation > Microsoft Defender Remediation TOCTOU and Object Manager Link-Race Abuse".

Repository Maintenance:

• MD Files Formatting: 988 files processed (18 files fixed)

Review Notes:

• This content was automatically processed and may require human review for accuracy
• Check that the placement within the repository structure is appropriate
• Verify that all technical details are correct and up-to-date
• All .md files have been checked for proper formatting (headers, includes, etc.)

Bot Version: HackTricks News Bot v1.0