CVE Vulnerability

CVE-2021-45100

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.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

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

Configuration 1
Information

Published : 2021-12-16 05:15

Updated : 2022-03-29 04:28

NVD link : CVE-2021-45100

Mitre link : CVE-2021-45100

Products Affected
No products.
CWE
CWE-319

Cleartext Transmission of Sensitive Information