Advisory Details

May 17th, 2023

Linux Kernel ksmbd Multichannel Improper Authentication Session Hijack Vulnerability

CVE ID	CVE-2023-32249
CVSS SCORE	6.5, AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to hijack a session 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 Session ID within Multichannel. The issue results from the lack of proper isolation when performing lookup on a session. An attacker can leverage this vulnerability to hijack arbitrary live session 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/3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2
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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