CVE-2021-45100 Weak cryptography in n/a
The ksmbd server incorrectly handles SMB encryption flags, causing Windows clients to disable encryption and transmit data in cleartext.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-45100?
CVE-2021-45100 is a high-severity vulnerability in Netapp H300e Firmware, published on 16 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-319
Which versions are affected by CVE-2021-45100?
It affects 9 products.
Products include Ksmbd Project Ksmbd, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware and 3 more.
How do I fix CVE-2021-45100?
Apply the vendor's patch.
Is CVE-2021-45100 being exploited?
There is no known exploitation of CVE-2021-45100 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2021-45100, GHSA-2872-89wh-3frc, UBUNTU-CVE-2021-45100.