CVE-2023-4154

Publication date 10 October 2023

Last updated 19 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

A design flaw was found in Samba's DirSync control implementation, which exposes passwords and secrets in Active Directory to privileged users and Read-Only Domain Controllers (RODCs). This flaw allows RODCs and users possessing the GET_CHANGES right to access all attributes, including sensitive secrets and passwords. Even in a default setup, RODC DC accounts, which should only replicate some passwords, can gain access to all domain secrets, including the vital krbtgt, effectively eliminating the RODC / DC distinction. Furthermore, the vulnerability fails to account for error conditions (fail open), like out-of-memory situations, potentially granting access to secret attributes, even under low-privileged attacker influence.

Status

Package Ubuntu Release Status
samba 25.10 questing
Fixed 2:4.18.6+dfsg-1ubuntu2.1
25.04 plucky
Fixed 2:4.18.6+dfsg-1ubuntu2.1
24.10 oracular
Fixed 2:4.18.6+dfsg-1ubuntu2.1
24.04 LTS noble
Fixed 2:4.18.6+dfsg-1ubuntu2.1
23.10 mantic
Fixed 2:4.18.6+dfsg-1ubuntu2.1
23.04 lunar
Fixed 2:4.17.7+dfsg-1ubuntu2.3
22.04 LTS jammy
Fixed 2:4.15.13+dfsg-0ubuntu1.5
20.04 LTS focal
Fixed 2:4.15.13+dfsg-0ubuntu0.20.04.6
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references