CVE-2021-45100 Information

Description

The ksmbd server through 3.4.2 as used in the Linux kernel through 5.15.8 sometimes communicates in cleartext even though encryption has been enabled. This occurs because it sets the SMB2_GLOBAL_CAP_ENCRYPTION flag when using the SMB 3.1.1 protocol which is a violation of the SMB protocol specification. When Windows 10 detects this protocol violation it disables encryption.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/cifsd-team/ksmbd/pull/551 https://github.com/cifsd-team/ksmbd/issues/550 https://marc.info/?l=linux-kernel&m=163961726017023&w=2 https://security.netapp.com/advisory/ntap-20220107-0001/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5