CVE-2022-37967
Description
A Kerberos elevation of privilege vulnerability was found in all versions Samba AD DC. It exploits weaknesses in the RC4-HMAC cipher, allowing a service account with constrained delegation permission to forge a more powerful Kerberos ticket. This flaw could enable privilege escalation by adding unauthorized groups to the Privilege Attribute Certificate (PAC) without knowing the krbtgt key.
Statement
The Samba package as shipped with Red Hat Enterprise Linux 6, 7, 8 and 9 is not affected by this issue as Red Hat doesn't provide the AD domain controller capability with it.
This vulnerability marked as Important because it allows privilege escalation without access to the krbtgt key, by exploiting RC4-HMAC weaknesses in Kerberos. An attacker with a service account and constrained delegation can forge tickets with unauthorized group memberships in the PAC, potentially gaining elevated access across the domain. This undermines Kerberos integrity and poses a high-impact risk in Samba AD DC environments.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.2 | 7.2 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | High | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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