Advisory Details

   March 1st, 2024

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

  ZDI-24-229
  ZDI-CAN-21940

   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
                         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.
   VULNERABILITY DETAILS
                         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)