Canonical ksmbd-tools SAMR Null Pointer Dereference Denial-of-Service Vulnerability

May 17th, 2023
ZDI-23-689 ZDI-CAN-17821

CVE ID

CVSS Score

7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors

Canonical

Affected Products

ksmbd-tools

Vulnerability Details

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Canonical ksmbd-tools. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of the SAMR_OPNUM_QUERY_SECURITY opcode. The issue results from dereferencing a NULL pointer. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

Fixed in 3.4.8 https://github.com/cifsd-team/ksmbd-tools/releases/tag/3.4.8


Disclosure Timeline

  • 2022-07-26 - Vulnerability reported to vendor
  • 2023-05-17 - Coordinated public release of advisory

Credit

Arnaud Gatignol, Quentin Minster, Florent Saudel, Guillaume Teissier (@thalium_team)

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