CVE-2023-4194

Public on 2023-08-07
Modified on 2024-01-12
Description
A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.
Severity
Medium severity
Medium
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 1 kernel Pending Fix
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-08-17 ALAS2KERNEL-5.4-2023-051 Fixed
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-09-27 ALAS2KERNEL-5.4-2023-054 Fixed
Amazon Linux 2023 kernel 2023-08-31 ALAS2023-2023-330 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N