CVE-2022-0336

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-29 · updated 2026-06-17
Weakness: CWE-276

Description

The Samba AD DC includes checks when adding service principals names (SPNs) to an account to ensure that SPNs do not alias with those already in the database. Some of these checks are able to be bypassed if an account modification re-adds an SPN that was previously present on that account, such as one added when a computer is joined to a domain. An attacker who has the ability to write to an account can exploit this to perform a denial-of-service attack by adding an SPN that matches an existing service. Additionally, an attacker who can intercept traffic can impersonate existing services, resulting in a loss of confidentiality and integrity.

Affected products

Fedoraproject Fedora: 34, 35
Samba: from 4.0.0 before 4.13.17; from 4.14.0 before 4.14.12; from 4.15.0 before 4.15.4 — fixed in 4.13.17, 4.14.12, 4.15.4

How to fix

Upgrade to a fixed version: Samba 4.13.17, 4.14.12, 4.15.4. Check the vendor advisory for mitigations.

References

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