High severity · published Dec 16, 2021
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
7.5
CVSS
0.9%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HF
H300e Firmware · Netapp
All versions, or not specified · source: NVD
HF
H300s Firmware · Netapp
All versions, or not specified · source: NVD
HF
H410c Firmware · Netapp
All versions, or not specified · source: NVD
HF
H410s Firmware · Netapp
All versions, or not specified · source: NVD
HF
H500e Firmware · Netapp
All versions, or not specified · source: NVD
HF
H500s Firmware · Netapp
All versions, or not specified · source: NVD
HF
H700e Firmware · Netapp
All versions, or not specified · source: NVD
HF
H700s Firmware · Netapp
All versions, or not specified · source: NVD
KS
Ksmbd · Ksmbd Project
through 3.4.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45100
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-45100
Third Party Advisory
https://github.com/cifsd-team/ksmbd/issues/550
Patch
https://github.com/cifsd-team/ksmbd/pull/551
Third Party Advisory
https://marc.info/?l=linux-kernel&m=163961726017023&w=2
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220107-0001/