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CVE-2023-0461

Public on 2023-02-28
Modified on 2024-03-01
Description

There is a use-after-free vulnerability in the Linux Kernel which can be exploited to achieve local privilege escalation. To reach the vulnerability kernel configuration flag CONFIG_TLS or CONFIG_XFRM_ESPINTCP has to be configured, but the operation does not require any privilege.

There is a use-after-free bug of icsk_ulp_data of a struct inet_connection_sock.

When CONFIG_TLS is enabled, user can install a tls context (struct tls_context) on a connected tcp socket. The context is not cleared if this socket is disconnected and reused as a listener. If a new socket is created from the listener, the context is inherited and vulnerable.

The setsockopt TCP_ULP operation does not require any privilege.

We recommend upgrading past commit 2c02d41d71f90a5168391b6a5f2954112ba2307c

Severity
Important
See what this means
CVSS v3 Base Score
7.8
See breakdown
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2023-03-17 15:53 ALAS-2023-1706
Amazon Linux 2 - Core kernel 2023-02-03 19:19 ALAS2-2023-1932
Amazon Linux 2 - Kernel-5.10 Extra kernel 2023-01-31 20:02 ALAS2KERNEL-5.10-2023-026
Amazon Linux 2 - Kernel-5.15 Extra kernel 2023-01-31 20:02 ALAS2KERNEL-5.15-2023-013
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-02-17 00:07 ALAS2KERNEL-5.4-2023-042
Amazon Linux 2023 kernel 2023-02-17 20:46 ALAS2023-2023-070

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H