Vulnerability · Published Dec 16, 2021 · Assigned by mitre
CVE-2021-45100
High 7.5
In plain English
A high-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)0.9%top 39.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.15.15-1 | DEBIAN-CVE-2021-45100 |
| Debian:13 | linux | 5.15.15-1 | DEBIAN-CVE-2021-45100 |
| Debian:14 | linux | 5.15.15-1 | DEBIAN-CVE-2021-45100 |
Affected products (as reported)
References
- https://github.com/cifsd-team/ksmbd/issues/550 x_refsource_MISC
- https://github.com/cifsd-team/ksmbd/pull/551 x_refsource_MISC
- https://marc.info/?l=linux-kernel&m=163961726017023&w=2 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20220107-0001/ x_refsource_CONFIRM