Description
A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Samba Team | samba | before 4.7.9, before 4.8.4 | — |
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 | 2:4.8.4+dfsg-1 | — |
| Debian 13 | samba | 2:4.8.4+dfsg-1 | — |
| Debian 12 | samba | 2:4.8.4+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.2 | USN-3738-1 |
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.15 | USN-3738-1 |
| Ubuntu 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.16 | USN-3738-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ctdb +26 | 4.8.3-4.el7 | RHSA-2018:3056 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Gluster Storage 3 | ctdb +22 | 4.7.5-110.el6rhs | RHSA-2018:2613, RHSA-2018:2612 |
| Red Hat Gluster Storage 3 | libtdb +3 | 1.3.15-4.el6rhs | RHSA-2018:2613, RHSA-2018:2612 |
| Red Hat Gluster Storage 3 | libtevent +2 | 0.9.35-1.el6rhs | RHSA-2018:2613, RHSA-2018:2612 |
| Red Hat Gluster Storage 3 | pytalloc +3 | 2.1.11-1.el6rhs | RHSA-2018:2613, RHSA-2018:2612 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | samba | 4.7.8+git.86.94b6d10f7dd-4.15.1 | SUSE-SU-2018:2318-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.14.6+git.182.2205d5224e3-1.1 | openSUSE-SU-2024:11365-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.8.4-r0 | — |
| Alpine v3.23 | samba | 4.8.4-r0 | — |
| Alpine v3.22 | samba | 4.8.4-r0 | — |
| Alpine v3.21 | samba | 4.8.4-r0 | — |
| Alpine v3.20 | samba | 4.8.4-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.8.4-r0 | — |
| Alpine v3.18 | samba | 4.8.4-r0 | — |
| Alpine v3.17 | samba | 4.8.4-r0 | — |
| Alpine v3.16 | samba | 4.8.4-r0 | — |
| Alpine v3.15 | samba | 4.8.4-r0 | — |
| Alpine v3.14 | samba | 4.8.4-r0 | — |
| Alpine v3.13 | samba | 4.8.4-r0 | — |
| Alpine v3.12 | samba | 4.8.4-r0 | — |
| Alpine v3.11 | samba | 4.8.4-r0 | — |
| Alpine v3.10 | samba | 4.8.4-r0 | — |
| Alpine v3.9 | samba | 4.8.4-r0 | — |
| Alpine v3.8 | samba | 4.8.4-r0 | — |
| Alpine v3.7 | samba | 4.7.6-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ctdb +26 | 4.8.3-4.amzn2.0.1 | ALAS2-2018-1126 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ctdb +26 | 4.8.3-4.el7 | ELSA-2018-3056 |
Advisories 9
- WID-SEC-2026-3118 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 31, 2026
- RHSA-2018:3056 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:2613 Red Hat Security Advisory: samba security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:2612 Red Hat Security Advisory: samba security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3738-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:11365-1 ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2318-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-1126 Moderate: samba security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 19, 2018
- ELSA-2018-3056 Moderate: samba security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
References
- RHSA-2018:2613 vendor-advisory
- USN-3738-1 vendor-advisory
- RHSA-2018:2612 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139
- 105084 vdb-entry
- RHSA-2018:3056 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180814-0001/
- https://www.samba.org/samba/security/CVE-2018-1139.html
- GLSA-202003-52 vendor-advisory