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 26.04 LTS resolute
Fixed 2:4.18.6+dfsg-1ubuntu2.1
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 Ignored end of standard support
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support

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

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