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CVE-2020-14386

CVE-2020-14386: Kerentanan Eskalasi Hak Istimewa di kernel Linux

October 12, 2020 by Winnie the Pooh

Peneliti di perusahaan keamanan siber Palo Alto telah menemukan adanya kerentanan pada Linux kernel.

Dicatat sebagai CVE-2020-14386, adalah sebuah kerentanan kerusakan memori di kernel Linux. Kerentanan ini dapat digunakan untuk meningkatkan hak istimewa dari pengguna yang tidak memiliki hak menjadi pengguna root pada sistem Linux.

Masalah aritmatika yang menyebabkan kerusakan memori ini. Masalahnya terletak pada fungsi tpacket_rcv, yang terletak di (net/packet/af_packet.c).

Agar kerentanan dapat dipicu, ini memerlukan kernel untuk mengaktifkan soket AF_PACKET (CONFIG_PACKET = y) dan hak istimewa CAP_NET_RAW untuk proses pemicuan, yang dapat diperoleh dalam namespace pengguna tanpa hak jika namespace pengguna diaktifkan (CONFIG_USER_NS = y) dan dapat diakses oleh pengguna yang tidak memiliki hak istimewa.

Dan ternyata, daftar panjang batasan ini terpenuhi secara default di beberapa Linux distro, seperti Ubuntu.

Palo Alto telah merilis patch perbaikan untuk bug ini dan detail teknis yang dapat diakses pada tautan berikut:
Source: Palo Alto

Tagged With: Bug, CVE-2020-14386, Cybersecurity, Linux, Security, Vulnerability

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