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You are here: Home / News / Bug zero-day Windows ‘InstallerFileTakeOver’ mendapat micropatch gratis

Bug zero-day Windows ‘InstallerFileTakeOver’ mendapat micropatch gratis

December 10, 2021 by Winnie the Pooh

Patch tidak resmi tersedia untuk kerentanan zero-day yang dieksploitasi secara aktif di alam liar untuk mendapatkan hak administrator.

Kode eksploitasi Proof-of-concept (PoC) telah diterbitkan untuk masalah ini, yang disebut sebagai bug “InstallerFileTakeOver”.

Kerentanan mempengaruhi semua versi Windows, termasuk Windows 11 dan Windows Server 2022, dan dapat dimanfaatkan oleh penyerang dengan akun lokal terbatas untuk meningkatkan hak istimewa dan menjalankan kode dengan hak admin.

Abdelhamid Naceri, peneliti yang membuat POC, menemukan masalah saat menganalisis patch untuk bug eskalasi hak istimewa lain yang dia laporkan ke Microsoft, yang saat ini dilacak sebagai CVE-2021-41379.

Dia menemukan bahwa perbaikan Microsoft tidak lengkap, meninggalkan ruang untuk eksploitasi untuk menjalankan kode dengan hak administrator. Naceri juga mencatat bahwa varian baru, yang belum menerima pengenal CVE, “lebih kuat daripada yang asli.”

Mitja Kolsek, salah satu pendiri layanan 0patch yang memberikan perbaikan terbaru yang tidak memerlukan reboot sistem, menjelaskan bahwa masalah berasal dari cara installer Windows membuat File Rollback (.RBF) yang memungkinkan pemulihan data yang dihapus atau diubah selama proses instalasi.

Pada satu titik, Windows mengubah lokasi file RBF dari “Config.msi” ke folder sementara dan memodifikasi izinnya untuk memungkinkan akses tulis pengguna.

Kode dari 0Patch memeriksa bahwa tidak ada persimpangan atau tautan di jalur tujuan file RBF; jika tidak, ini memblokir pemindahan file untuk menghilangkan risiko eksploitasi.

Micropatch gratis dan berfungsi di Windows 7 ESU, Windows 10, Server 2008 ESU/2012/2016/2019.

Perlu dicatat, kode koreksi 0Patch adalah solusi sementara yang ditujukan untuk menjaga keamanan sistem hingga Microsoft merilis tambalan permanen untuk masalah tersebut.

Selengkapnya: Bleeping Computer

Tagged With: Cybersecurity, Keamanan Siber, Kerentanan Keamanan, Vulnerability, Windows

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