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
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 |
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 |