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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
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CVSS v3 Base Score
5.5
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-08-17 17:04 ALAS2KERNEL-5.4-2023-051
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-09-27 22:59 ALAS2KERNEL-5.4-2023-054
Amazon Linux 2 - Kernel-5.10 Extra kernel 2023-08-31 22:50 ALAS2KERNEL-5.10-2023-039
Amazon Linux 2 - Kernel-5.15 Extra kernel 2023-08-31 22:46 ALAS2KERNEL-5.15-2023-026
Amazon Linux 2023 kernel 2023-08-31 21:45 ALAS2023-2023-330

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

References

Red Hat: CVE-2023-4194 Mitre: CVE-2023-4194 FAQs regarding Amazon Linux ALAS/CVE Severity