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ubuntucveUbuntu.comUB:CVE-2023-3347
HistoryJul 19, 2023 - 12:00 a.m.

CVE-2023-3347

2023-07-1900:00:00
ubuntu.com
ubuntu.com
13
samba
smb2
packet signing
vulnerability
man-in-the-middle
attack
server
enforcement
data integrity

5.9 Medium

CVSS3

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

0.001 Low

EPSS

Percentile

38.1%

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.

Bugs

Notes

Author Note
mdeslaur 4.17.0 and higher only
OSVersionArchitecturePackageVersionFilename
ubuntu23.04noarchsamba< 2:4.17.7+dfsg-1ubuntu1.1UNKNOWN

5.9 Medium

CVSS3

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

0.001 Low

EPSS

Percentile

38.1%