Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Storage 3 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | samba | 2:4.18.5+dfsg-1 | — |
| Debian 13 | samba | 2:4.18.5+dfsg-1 | — |
| Debian 12 | samba | 2:4.17.10+dfsg-0+deb12u1 | DSA-5477-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1.2 | USN-6238-1 |
| Ubuntu 20.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu0.20.04.3 | USN-6238-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | ctdb +33 | 4.17.5-103.el9_2 | RHSA-2023:4325 |
| RHEL 8 | ctdb +33 | 4.17.5-3.el8_8 | RHSA-2023:4328 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | ctdb +33 | 4.17.5-103.el9_2.alma | ALSA-2023:4325 |
| AlmaLinux 8 | ctdb +33 | 4.17.5-3.el8_8.alma | ALSA-2023:4328 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | samba | 4.17.9+git.367.dae41ffdd1f-150500.3.5.1 | SUSE-SU-2023:2929-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.18.5+git.313.c8e274c7852-1.1 | openSUSE-SU-2024:13071-1 |
| openSUSE Leap 15.5 | samba | 4.17.9+git.367.dae41ffdd1f-150500.3.5.1 | SUSE-SU-2023:2929-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | samba +31 | 2:4.17.10-0.amzn2023.0.1 | ALAS2023-2023-316 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | samba +32 | 4.17.5-103.0.1.el9_2 | ELSA-2023-4325 |
| Oracle Linux 8 | ctdb +34 | 4.17.5-3.0.1.el8_8 | ELSA-2023-4328 |
Advisories 12
- ALSA-2023:4325 Moderate: samba security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:4328 Moderate: samba security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:4325 Red Hat Security Advisory: samba security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:4328 Red Hat Security Advisory: samba security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- WID-SEC-2023-1842 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 25, 2026
- USN-6238-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5477-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:13071-1 ctdb-4.18.5+git.313.c8e274c7852-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2929-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2023-316 Important: samba security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 23, 2023
- ELSA-2023-4325 Moderate: samba security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 2, 2023
- ELSA-2023-4328 Moderate: samba security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 2, 2023
References
- RHSA-2023:4325 vendor-advisory
- RHSA-2023:4328 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-3347 vdb-entry
- RHBZ#2222792 issue-tracking
- https://www.samba.org/samba/security/CVE-2023-3347.html