Oracle Linux: CVE-2023-0461: ELSA-2023-2458: kernel security, bug fix, and enhancement update (IMPORTANT) (Multiple Advisories)

Oracle Linux: CVE-2023-0461: ELSA-2023-2458:kernel security, bug fix, and enhancement update (IMPORTANT) (Multiple Advisories)

Severity

7

CVSS

(AV:L/AC:L/Au:S/C:C/I:C/A:C)

Published

02/23/2023

Created

07/26/2024

Added

07/22/2024

Modified

12/06/2024

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 A use-after-free flaw was found in the Linux kernel’s TLS protocol functionality in how a user installs a tls context (struct tls_context) on a connected TCP socket. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Solution(s)

• oracle-linux-upgrade-kernel

References

• https://attackerkb.com/topics/cve-2023-0461
• CVE - 2023-0461
• ELSA-2023-2458
• ELSA-2023-2951