Advisory Details

March 1st, 2024

Linux Kernel ksmbd Session Key Exchange Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2023-52440
CVSS SCORE	9.0, AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code 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 processing of session keys. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the kernel.
ADDITIONAL DETAILS	Linux has issued an update to correct this vulnerability. More details can be found at: https://github.com/torvalds/linux/commit/4b081ce0d830b684fdf967abc3696d1261387254
DISCLOSURE TIMELINE	2023-08-24 - Vulnerability reported to vendor 2024-03-01 - Coordinated public release of advisory
CREDIT	Pumpkin (@u1f383)

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