Description
A flaw was found in the way samba client before samba 4.4.16, samba 4.5.14 and samba 4.6.8 used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Samba | samba | 4.4.16, 4.5.14, 4.6.8 | — |
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 | 2:4.6.7+dfsg-2 | — |
| Debian 13 | samba | 2:4.6.7+dfsg-2 | — |
| Debian 12 | samba | 2:4.6.7+dfsg-2 | — |
| Debian 9 | samba | 2:4.5.8+dfsg-2+deb9u2 | DSA-3983-1 |
| Debian 8 | samba | 2:4.2.14+dfsg-0+deb8u8 | DSA-3983-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.11 | USN-3426-1 |
| Ubuntu 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.12 | USN-3426-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ctdb +25 | 4.6.2-11.el7_4 | RHSA-2017:2790 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Gluster Storage 3 | ctdb +25 | 4.6.3-6.el6rhs | RHSA-2017:2858 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | samba | 4.6.7+git.51.327af8d0a11-3.12.1 | SUSE-SU-2017:3155-1, SUSE-SU-2017:2695-1 |
| SLES 12 SP2 | samba | 4.2.4-28.21.1 | SUSE-SU-2017:2971-1, SUSE-SU-2017:2650-1 |
| SLES 12 SP1 | samba | 4.2.4-28.19.3 | SUSE-SU-2017:2971-1, SUSE-SU-2017:2726-1 |
| SLES 12 | samba | 4.2.4-18.44.2 | SUSE-SU-2017:2704-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | samba | 4.6.7+git.51.327af8d0a11-3.12.1 | SUSE-SU-2017:3155-1, SUSE-SU-2017:2695-1 |
| SLES for SAP 12 SP2 | samba | 4.2.4-28.21.1 | SUSE-SU-2017:2971-1, SUSE-SU-2017:2650-1 |
| SLES for SAP 12 SP1 | samba | 4.2.4-28.19.3 | SUSE-SU-2017:2971-1, SUSE-SU-2017:2726-1 |
| SUSE OpenStack Cloud 6 | samba | 4.2.4-28.19.3 | SUSE-SU-2017:2971-1, SUSE-SU-2017:2726-1 |
| SUSE Enterprise Storage 5 | samba | 4.6.9+git.59.c2cff9cea4c-3.17.1 | SUSE-SU-2017:3155-1 |
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 | 4.7.0-r0 | — |
| Alpine v3.23 | samba | 4.7.0-r0 | — |
| Alpine v3.22 | samba | 4.7.0-r0 | — |
| Alpine v3.21 | samba | 4.7.0-r0 | — |
| Alpine v3.20 | samba | 4.7.0-r0 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.7.0-r0 | — |
| Alpine v3.18 | samba | 4.7.0-r0 | — |
| Alpine v3.17 | samba | 4.7.0-r0 | — |
| Alpine v3.16 | samba | 4.7.0-r0 | — |
| Alpine v3.15 | samba | 4.7.0-r0 | — |
| Alpine v3.14 | samba | 4.7.0-r0 | — |
| Alpine v3.13 | samba | 4.7.0-r0 | — |
| Alpine v3.12 | samba | 4.7.0-r0 | — |
| Alpine v3.11 | samba | 4.7.0-r0 | — |
| Alpine v3.10 | samba | 4.7.0-r0 | — |
| Alpine v3.9 | samba | 4.7.0-r0 | — |
| Alpine v3.8 | samba | 4.7.0-r0 | — |
| Alpine v3.7 | samba | 4.7.0-r0 | — |
| Alpine v3.6 | samba | 4.6.8-r0 | — |
| Alpine v3.5 | samba | 4.5.14-r0 | — |
| Alpine v3.4 | samba | 4.4.16-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ctdb +25 | 4.6.2-11.el7_4 | ELSA-2017-2790 |
Advisories 12
- RHSA-2017:2858 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:2790 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3426-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3983-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:3155-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2695-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 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-2017:2971-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2726-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2704-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2650-1 Security update for samba SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2017-2790 Moderate: samba security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 26, 2017
References
- https://security.netapp.com/advisory/ntap-20170921-0001/
- RHSA-2017:2790 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12151
- 100917 vdb-entry
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03817en_us
- DSA-3983 vendor-advisory
- RHSA-2017:2858 vendor-advisory
- 1039401 vdb-entry
- https://www.samba.org/samba/security/CVE-2017-12151.html