CVE-2023-42670

Publication date 10 October 2023

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba’s RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation “classic DCs”) can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as “The procedure number is out of range” when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.

Read the notes from the security team

Status

Package Ubuntu Release Status
samba 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
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

4.16+ only

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references