tazxtazxedu/WinRE-Fix

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PoC files

3 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

The artifact is a PowerShell script (Winre-Fix.ps1) and its README that automates resizing the Windows Recovery Environment (WinRE) partition to allow installation of security updates, including the patch for CVE-2024-20666. It checks for sufficient unallocated disk space, disables WinRE, deletes the old recovery partition, extends the C: drive, creates a new recovery partition, and re-enables WinRE. It does not contain code to exploit the BitLocker bypass vulnerability; it only prepares the system to receive the official Microsoft patch.

Backdoor review

No backdoor observed in reviewed code

The repository contains a README and a PowerShell script (Winre-Fix.ps1) that automates moving the Windows Recovery Environment (WinRE) to a new partition. The script performs standard disk management operations (checking unallocated space, disabling/enabling WinRE via reagentc, deleting/creating partitions, formatting, setting GPT attributes) and includes safety checks (administrator check, backup confirmation, size sanity checks). No concealed executable behavior, credential theft, persistence mechanisms, unrelated remote access, or deceptive payloads were observed. The script's actions are consistent with its stated purpose of fixing WinRE partition issues related to CVE-2024-20666.

ClassificationScanner
Model confidence95%
AuthenticationRequired
LanguagesPowerShell
Target softwareMicrosoft WindowsWindows Recovery Environment (WinRE)
Attack typesnone
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The script's purpose is to fix the WinRE partition size to allow installation of security updates (KB5034441/KB5028997) that address CVE-2024-20666. It performs disk partition management and WinRE configuration checks and modifications. It does not contain any code that exploits the BitLocker security feature bypass; it only prepares the system to receive the patch. This is consistent with a scanner (or more precisely, a remediation tool) that checks for and resolves the prerequisite condition for the update, not an exploit.

README.md:15-19Winre-Fix.ps1:7-10

Requirements

  • Must be run as AdministratorWinre-Fix.ps1:89-92
  • Requires GPT disk and UEFI boot modeWinre-Fix.ps1:44-45
  • Requires at least 1.2 GB unallocated space on Disk 0Winre-Fix.ps1:46

Observed behavior

  • Checks for unallocated space on Disk 0 and exits if none foundWinre-Fix.ps1:127-157
  • Scans partitions for the Recovery GPT type to locate the existing WinRE partitionWinre-Fix.ps1:200-214
  • Disables WinRE using reagentc /disableWinre-Fix.ps1:247-248
  • Deletes the old recovery partitionWinre-Fix.ps1:260-261
  • Extends the C: drive, reserving 1 GB for a new recovery partitionWinre-Fix.ps1:287-295
  • Creates a new partition, formats it as NTFS, and sets the Recovery GPT type and hidden attributeWinre-Fix.ps1:302-328
  • Re-enables WinRE using reagentc /enableWinre-Fix.ps1:347-348
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Script Behavior
Uses reagentc /disable and reagentc /enable to manage WinREStandard Windows Recovery Environment management commands, consistent with the script's stated purpose.Winre-Fix.ps1:247-248Winre-Fix.ps1:347-348
Script Behavior
Deletes and creates disk partitions using Remove-Partition, New-Partition, Resize-PartitionNecessary for moving the recovery partition; includes user confirmation and safety checks.Winre-Fix.ps1:261Winre-Fix.ps1:294Winre-Fix.ps1:302
Script Behavior
Writes log to C:\temp\WinRE-Fix-Log.txtLogging of operations, no sensitive data exfiltration observed.Winre-Fix.ps1:57-58Winre-Fix.ps1:69
Review boundaries

What the analysis did not establish

  • One file (likely a license or .gitignore) was omitted from the text evidence; its content is not material to classification.
  • The evidence does not include execution output or verification that the script successfully enables the update.
  • One file (metadata only, 1071 bytes) was not provided as text; its content is unknown.
  • The review is based solely on static analysis of the supplied text; the script was not executed.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1