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You are here: Home / News / Lubang keamanan baru di CPU Intel mengirimkan tambalan perusahaan (lagi)

Lubang keamanan baru di CPU Intel mengirimkan tambalan perusahaan (lagi)

November 17, 2021 by Winnie the Pooh

Intel sedang memperbaiki kerentanan yang dapat dieksploitasi oleh orang yang tidak berwenang dengan akses fisik untuk menginstal firmware berbahaya pada chip untuk mengalahkan berbagai tindakan, termasuk perlindungan yang diberikan oleh Bitlocker, modul trusted platform, pembatasan anti-penyalinan, dan lainnya.

Kerentanan—ada di Pentium, Celeron, dan CPU Atom pada platform Apollo Lake, Gemini Lake, dan Gemini Lake Refresh—memungkinkan peretas terampil dengan kepemilikan chip yang terpengaruh untuk menjalankannya dalam mode debug dan pengujian yang digunakan oleh pengembang firmware. Intel dan pembuat chip lainnya berusaha keras untuk mencegah akses tersebut oleh orang yang tidak berwenang.

Setelah dalam mode pengembang, penyerang dapat mengekstrak kunci yang digunakan untuk mengenkripsi data yang disimpan di enklave TPM dan, jika TPM digunakan untuk menyimpan kunci Bitlocker, akan mengalahkan perlindungan yang terakhir itu juga.

Musuh juga dapat melewati batasan penandatanganan kode yang mencegah firmware yang tidak sah berjalan di Intel Management Engine, subsistem di dalam CPU yang rentan, dan dari sana secara permanen membuat backdoor pada chip.

Sementara serangan itu mengharuskan penyerang untuk memiliki akses fisik singkat ke perangkat yang rentan itulah skenario TPM, Bitlocker, dan codesigning dirancang untuk dimitigasi. Seluruh proses memakan waktu sekitar 10 menit.

Kerentanan seperti ini kemungkinan tidak akan pernah dieksploitasi dalam serangan tanpa pandang bulu, tetapi setidaknya secara teoritis, dapat digunakan dalam kasus di mana musuh dengan sumber daya yang cukup besar mengejar target bernilai tinggi.

Maka dari itu pengguna dianjurkan untuk menginstal pembaruan pada mesin apa pun yang terpengaruh.

Selengkapnya: Ars Technica

Tagged With: CPU, Cybersecurity, Intel, Security Patch, Vulnerability

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