Samba: smb2 packet signing is not enforced when "server signing = required" is set

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Summary

CVECVE-2023-3347
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-07-20 15:15:11 UTC
Updated2026-11-07 05:17:45 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

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

Problem Types: CWE-347 | NVD-CWE-noinfo | CWE-924 | CWE-347 Improper Verification of Cryptographic Signature | CWE-924 CWE-924 Improper Enforcement of Message Integrity During Transmission in a Communication Channel

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Samba Samba All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.17.5-3.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.17.5-3.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:4.17.5-103.el9_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:4.17.5-103.el9_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Storage 3 Not specified Not specified

References

ReferenceSourceLinkTags
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
2222792 – (CVE-2023-3347) CVE-2023-3347 samba: SMB2 packet signing is not enforced when "server signing = required" is set af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
July 2023 Samba Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
[SECURITY] Fedora 37 Update: samba-4.17.10-0.fc37 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
[SECURITY] Fedora 38 Update: samba-4.18.5-0.fc38 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Debian -- Security Information -- DSA-5477-1 samba af854a3a-2127-422b-91ae-364da2661108 www.debian.org
Samba - Security Announcement Archive af854a3a-2127-422b-91ae-364da2661108 www.samba.org Vendor Advisory
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-07-13T00:00:00.000ZReported to Red Hat.
CNA2023-07-19T00:00:00.000ZMade public.

Legacy QID Mappings

  • 160827 Oracle Enterprise Linux Security Update for samba (ELSA-2023-4325)
  • 160834 Oracle Enterprise Linux Security Update for samba (ELSA-2023-4328)
  • 199593 Ubuntu Security Notification for Samba Vulnerabilities (USN-6238-1)
  • 241872 Red Hat Update for samba (RHSA-2023:4328)
  • 241875 Red Hat Update for samba (RHSA-2023:4325)
  • 284336 Fedora Security Update for samba (FEDORA-2023-76c06c8576)
  • 284369 Fedora Security Update for samba (FEDORA-2023-bcd91bfcd3)
  • 355878 Amazon Linux Security Advisory for samba : ALAS2023-2023-316
  • 378775 Alibaba Cloud Linux Security Update for samba (ALINUX3-SA-2023:0093)
  • 6000221 Debian Security Update for samba (DSA 5477-1)
  • 691226 Free Berkeley Software Distribution (FreeBSD) Security Update for samba (441e1e1a-27a5-11ee-a156-080027f5fec9)
  • 710873 Gentoo Linux Samba Multiple Vulnerabilities (GLSA 202402-28)
  • 755893 SUSE Enterprise Linux Security Update for samba (SUSE-SU-2023:2929-1)
  • 941206 AlmaLinux Security Update for samba (ALSA-2023:4328)
  • 941207 AlmaLinux Security Update for samba (ALSA-2023:4325)

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