Advisory Details

July 20th, 2023

Linux Kernel ksmbd Session Setup Out-Of-Bounds Read Information Disclosure Vulnerability

CVE ID	CVE-2023-3867
CVSS SCORE	7.2, AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable. The specific flaw exists within the handling of session setup commands. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary 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://lore.kernel.org/all/20230624040141.16088-1-linkinjeon@kernel.org/
DISCLOSURE TIMELINE	2023-06-21 - Vulnerability reported to vendor 2023-07-20 - Coordinated public release of advisory 2023-07-28 - Advisory Updated
CREDIT	HexRabbit (@h3xr4bb1t) and Pumpkin (@u1f383)

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