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sambaSamba SecuritySAMBA:CVE-2022-0336
HistoryJan 31, 2022 - 12:00 a.m.

Samba AD users with permission to write to

2022-01-3100:00:00
Samba Security
www.samba.org
52
samba ad
spn
denial-of-service
impersonation
security patch
confidentiality
integrity
samba 4.13.17
samba 4.14.12
samba 4.15.4
kees van vloten
joseph sutton
catalyst

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.004

Percentile

74.6%

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.

Patch Availability

Patches addressing both these issues have been posted to:

https://www.samba.org/samba/security/

Additionally, Samba 4.13.17, 4.14.12, and 4.15.4 have been issued
as security releases to correct the defect. Samba administrators are
advised to upgrade to these releases or apply the patch as soon
as possible.

CVSSv3 calculation

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (8.8)

Workaround

None.

Credits

Originally reported by Kees van Vloten.

Analysis, patches, and this advisory by Joseph Sutton of Catalyst
and the Samba Team.

== Our Code, Our Bugs, Our Responsibility.
== The Samba Team

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.004

Percentile

74.6%