CVE-2023-3347 Samba: smb2 packet signing is not enforced when "server signing = required" is set

2023-07-2014:54:05

redhat

github.com

samba

smb2

packet signing

vulnerability

man-in-the-middle

network traffic

data integrity

domain controllers

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

6.9

Confidence

Low

EPSS

0.001

Percentile

35.7%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

A vulnerability was found in Samba’s SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured “server signing = required” or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.