Advisory Details

May 17th, 2023

Linux Kernel ksmbd Improper Restriction of Excessive Authentication Attempts Protection Bypass Vulnerability

CVE ID	CVE-2023-32251
CVSS SCORE	3.7, AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to create a brute force condition on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable. The specific flaw exists within the handling of asynchronous connections. The issue results from the lack of protection of an authentication mechanism. An attacker can leverage this vulnerability to brute force the credentials on the system.
ADDITIONAL DETAILS	Linux has issued an update to correct this vulnerability. More details can be found at: https://github.com/torvalds/linux/commit/b096d97f47326b1e2dbdef1c91fab69ffda54d17
DISCLOSURE TIMELINE	2023-04-27 - Vulnerability reported to vendor 2023-05-17 - Coordinated public release of advisory
CREDIT	Quentin Minster (@thalium_team)

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