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You are here: Home / News / Microsoft meminta admin untuk menambal PowerShell untuk memperbaiki bypass WDAC

Microsoft meminta admin untuk menambal PowerShell untuk memperbaiki bypass WDAC

October 20, 2021 by Winnie the Pooh Leave a Comment

Microsoft telah meminta administrator sistem untuk menambal PowerShell 7 terhadap dua kerentanan yang memungkinkan penyerang untuk melewati penegakan Windows Defender Application Control (WDAC) dan mendapatkan akses ke kredensial plain text.

PowerShell adalah solusi lintas platform yang menyediakan shell baris perintah, kerangka kerja, dan bahasa skrip yang berfokus pada otomatisasi untuk memproses cmdlet PowerShell.

Microsoft merilis PowerShell 7.0.8 dan PowerShell 7.1.5 untuk mengatasi kerentanan keamanan ini di cabang PowerShell 7 dan PowerShell 7.1 pada bulan September dan Oktober.

WDAC dirancang untuk melindungi perangkat Windows dari perangkat lunak yang berpotensi berbahaya dengan memastikan bahwa hanya aplikasi dan driver tepercaya yang dapat berjalan, sehingga memblokir peluncuran malware dan perangkat lunak yang tidak diinginkan.

Saat lapisan keamanan WDAC berbasis perangkat lunak diaktifkan di Windows, PowerShell secara otomatis masuk ke mode bahasa terbatas, membatasi akses hanya ke serangkaian API Windows yang terbatas.

Dengan memanfaatkan fitur keamanan Windows Defender Application Control melewati kerentanan yang dilacak sebagai CVE-2020-0951, pelaku ancaman dapat menghindari daftar yang diizinkan WDAC, yang memungkinkan mereka menjalankan perintah PowerShell yang seharusnya diblokir saat WDAC diaktifkan.

Cacat kedua, dilacak sebagai CVE-2021-41355, adalah kerentanan pengungkapan informasi di .NET Core di mana kredensial dapat bocor dalam clear teks pada perangkat yang menjalankan platform non-Windows.

Microsoft mengatakan tidak ada langkah-langkah mitigasi saat ini tersedia untuk memblokir eksploitasi kelemahan keamanan ini.

Admin disarankan untuk menginstal versi PowerShell 7.0.8 dan 7.1.5 yang diperbarui sesegera mungkin untuk melindungi sistem dari potensi serangan.

Selengkapnya: Bleeping Computer

Tagged With: Cybersecurity, PowerShell, Vulnerability

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