Advisory Details

   March 1st, 2024

Linux Kernel ksmbd Negotiate Request Out-Of-Bounds Read Information Disclosure Vulnerability

  ZDI-24-228
  ZDI-CAN-21541

   CVE ID                CVE-2023-52441
   CVSS SCORE            8.6, AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
   AFFECTED VENDORS      Linux
   AFFECTED PRODUCTS     Kernel
                         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.
   VULNERABILITY DETAILS
                         The specific flaw exists within the handling of SMB2 negotiate requests. 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://github.com/torvalds/linux/commit/536bb492d39bb6c080c92f31e8a55fe9934f452b
   DISCLOSURE TIMELINE     • 2023-07-18 - Vulnerability reported to vendor
                           • 2024-03-01 - Coordinated public release of advisory
   CREDIT                Anonymous