Description
The MS-SAMR and MS-LSAD protocol implementations in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 mishandle DCERPC connections, which allows man-in-the-middle attackers to perform protocol-downgrade attacks and impersonate users by modifying the client-server data stream, aka "BADLOCK."
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 | 2:4.3.7+dfsg-1 | — |
| Debian 13 | samba | 2:4.3.7+dfsg-1 | — |
| Debian 12 | samba | 2:4.3.7+dfsg-1 | — |
| Debian 8 | samba | 2:4.2.10+dfsg-0+deb8u1 | DSA-3548-1 |
| Debian 7 | samba | 2:3.6.6-6+deb7u9 | DSA-3548-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | samba | 2:4.3.8+dfsg-0ubuntu1 | — |
| Ubuntu 14.04 LTS | samba | 2:4.3.8+dfsg-0ubuntu0.14.04.2 | USN-2950-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ctdb +26 | 4.2.10-6.el7_2 | RHSA-2016:0612 |
| RHEL 7 | ipa +6 | 4.2.0-15.el7_2.6.1 | RHSA-2016:0612 |
| RHEL 7 | libtdb +3 | 1.3.8-1.el7_2 | RHSA-2016:0612 |
| RHEL 7 | libtevent +2 | 0.9.26-1.el7_2 | RHSA-2016:0612 |
| RHEL 7 | openchange +3 | 2.0-10.el7_2 | RHSA-2016:0612 |
| RHEL 7 | pyldb +4 | 1.1.25-1.el7_2 | RHSA-2016:0612 |
| RHEL 7 | pytalloc +3 | 2.1.5-1.el7_2 | RHSA-2016:0612 |
| RHEL 6 | ipa +6 | 3.0.0-47.el6_7.2 | RHSA-2016:0612 |
| RHEL 6 | libtdb +3 | 1.3.8-1.el6_7 | RHSA-2016:0612 |
| RHEL 6 | libtevent +2 | 0.9.26-2.el6_7 | RHSA-2016:0612 |
| RHEL 6 | openchange +3 | 1.0-7.el6_7 | RHSA-2016:0612 |
| RHEL 6 | pyldb +4 | 1.1.25-2.el6_7 | RHSA-2016:0612 |
| RHEL 6 | pytalloc +3 | 2.1.5-1.el6_7 | RHSA-2016:0612 |
| RHEL 6 | samba +12 | 3.6.23-30.el6_7 | RHSA-2016:0611 |
| RHEL 6 | samba4 +12 | 4.2.10-6.el6_7 | RHSA-2016:0612 |
| RHEL 5 | samba +5 | 3.0.33-3.41.el5_11 | RHSA-2016:0621 |
| RHEL 5 | samba3x +7 | 3.6.23-12.el5_11 | RHSA-2016:0613 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Mission Critical 6 | evolution-mapi +1 | 0.28.3-8.el6_2 | RHSA-2016:0620 |
| Red Hat Rhel Mission Critical 6 | openchange +3 | 1.0-1.el6_2 | RHSA-2016:0620 |
| Red Hat Rhel Mission Critical 6 | pyldb +4 | 1.1.25-2.el6_2 | RHSA-2016:0620 |
| Red Hat Rhel Mission Critical 6 | samba +11 | 3.6.23-30.el6_2 | RHSA-2016:0619 |
| Red Hat Rhel Mission Critical 6 | samba4 +3 | 4.2.10-6.el6_2 | RHSA-2016:0620 |
| Red Hat Rhel Mission Critical 6 | sssd +5 | 1.5.1-66.el6_2.5 | RHSA-2016:0620 |
| Red Hat Rhel Mission Critical 5 | samba +5 | 3.0.33-3.30.el5_6 | RHSA-2016:0623 |
| Red Hat Rhel Mission Critical 5 | samba3x +7 | 3.6.23-12.el5_6 | RHSA-2016:0624 |
| RHEL 7.1 EUS | ctdb +25 | 4.2.10-5.ael7b_1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | ipa +2 | 4.1.0-18.ael7b_1.6 | RHSA-2016:0618 |
| RHEL 7.1 EUS | ipa-server +2 | 4.1.0-18.el7_1.6 | RHSA-2016:0618 |
| RHEL 7.1 EUS | libtdb +3 | 1.3.8-1.ael7b_1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | libtevent +2 | 0.9.26-1.ael7b_1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | openchange +3 | 2.0-4.ael7b_1.1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | pyldb +4 | 1.1.25-1.ael7b_1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | pytalloc +3 | 2.1.5-1.ael7b_1 | RHSA-2016:0618 |
| RHEL 7.1 EUS | samba-vfs-glusterfs | 4.2.10-5.el7_1 | RHSA-2016:0618 |
| RHEL 6.6 EUS | ipa +6 | 3.0.0-42.el6_6.1 | RHSA-2016:0620 |
| RHEL 6.6 EUS | openchange +3 | 1.0-7.el6_6 | RHSA-2016:0620 |
| RHEL 6.6 EUS | pyldb +4 | 1.1.25-2.el6_6 | RHSA-2016:0620 |
| RHEL 6.6 EUS | samba +12 | 3.6.23-30.el6_6 | RHSA-2016:0619 |
| RHEL 6.6 EUS | samba4 +12 | 4.2.10-6.el6_6 | RHSA-2016:0620 |
| RHEL 6.5 AUS | ipa +6 | 3.0.0-37.el6_5.1 | RHSA-2016:0620 |
| RHEL 6.5 AUS | openchange +3 | 1.0-7.el6_5 | RHSA-2016:0620 |
| RHEL 6.5 AUS | pyldb +4 | 1.1.25-2.el6_5 | RHSA-2016:0620 |
| RHEL 6.5 AUS | samba +11 | 3.6.23-30.el6_5 | RHSA-2016:0619 |
| RHEL 6.5 AUS | samba4 +12 | 4.2.10-6.el6_5 | RHSA-2016:0620 |
| RHEL 6.5 AUS | sssd +10 | 1.9.2-129.el6_5.7 | RHSA-2016:0620 |
| RHEL 6.4 AUS | ipa +6 | 3.0.0-26.el6_4.5 | RHSA-2016:0620 |
| RHEL 6.4 AUS | openchange +3 | 1.0-5.el6_4 | RHSA-2016:0620 |
| RHEL 6.4 AUS | pyldb +4 | 1.1.25-2.el6_4 | RHSA-2016:0620 |
| RHEL 6.4 AUS | samba +11 | 3.6.23-30.el6_4 | RHSA-2016:0619 |
| RHEL 6.4 AUS | samba4 +12 | 4.2.10-6.el6_4 | RHSA-2016:0620 |
| RHEL 6.4 AUS | sssd +10 | 1.9.2-82.12.el6_4 | RHSA-2016:0620 |
| RHEL 5.9 AUS | samba +5 | 3.0.33-3.40.el5_9 | RHSA-2016:0623 |
| RHEL 5.9 AUS | samba3x +7 | 3.6.23-12.el5_9 | RHSA-2016:0624 |
| RHEL 4 ELS | samba +3 | 3.0.33-3.37.el4 | RHSA-2016:0625 |
| Red Hat Gluster Storage 3 | ctdb +26 | 4.2.11-2.el6rhs | RHSA-2016:0614 |
| Red Hat Gluster Storage 3 | libtdb +3 | 1.3.8-1.el6rhs | RHSA-2016:0614 |
| Red Hat Gluster Storage 3 | libtevent +2 | 0.9.26-1.el6rhs | RHSA-2016:0614 |
| Red Hat Gluster Storage 3 | pyldb +4 | 1.1.24-1.el6rhs | RHSA-2016:0614 |
| Red Hat Gluster Storage 3 | pytalloc +3 | 2.1.5-1.el6rhs | RHSA-2016:0614 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | samba | 4.2.4-16.1 | SUSE-SU-2016:1024-1 |
| SLES 12 | samba | 4.2.4-18.17.1 | SUSE-SU-2016:1022-1 |
| SLES 11 SP4 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SLES 11 SP4 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
| SLES 11 SP3 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SLES 11 SP3 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
| SLES 11 SP2 | samba +1 | 3.6.3-52.1 | SUSE-SU-2016:1028-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | samba | 4.2.4-16.1 | SUSE-SU-2016:1024-1 |
| SLES for SAP 12 | samba | 4.2.4-18.17.1 | SUSE-SU-2016:1022-1 |
| SLES for SAP 11 SP4 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SLES for SAP 11 SP4 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
| SUSE OpenStack Cloud 5 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SUSE OpenStack Cloud 5 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
| SUSE Manager Proxy 2.1 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SUSE Manager Proxy 2.1 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
| SUSE Manager 2.1 | samba | 3.6.3-76.1 | SUSE-SU-2016:1023-1 |
| SUSE Manager 2.1 | samba-doc | 3.6.3-76.2 | SUSE-SU-2016:1023-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.5.0-1.1 | openSUSE-SU-2024:10069-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ctdb +26 | 4.2.10-6.el7_2 | ELSA-2016-0612 |
| Oracle Linux 7 | ipa-client +5 | 4.2.0-15.0.1.el7_2.6.1 | ELSA-2016-0612 |
| Oracle Linux 7 | ipa-server-selinux | 3.0.0-47.el6_7.2 | ELSA-2016-0612 |
| Oracle Linux 7 | libtdb +3 | 1.3.8-1.el7_2 | ELSA-2016-0612 |
| Oracle Linux 7 | libtevent +2 | 0.9.26-2.el6_7 | ELSA-2016-0612 |
| Oracle Linux 7 | openchange +3 | 2.0-10.el7_2 | ELSA-2016-0612 |
| Oracle Linux 7 | pyldb +4 | 1.1.25-2.el6_7 | ELSA-2016-0612 |
| Oracle Linux 7 | pytalloc +3 | 2.1.5-1.el7_2 | ELSA-2016-0612 |
| Oracle Linux 7 | samba4 +12 | 4.2.10-6.el6_7 | ELSA-2016-0612 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
nickanderson/cfengine-CVE-2016-2118 ★ 0 · Apr 17, 2016
An example detection and remediation policy.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 19
- RHSA-2016:0624 Red Hat Security Advisory: samba3x security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0625 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0621 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0623 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0620 Red Hat Security Advisory: samba4 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0619 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0618 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0614 Red Hat Security Advisory: samba security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0613 Red Hat Security Advisory: samba3x security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0611 Red Hat Security Advisory: samba security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2016:0612 Red Hat Security Advisory: samba and samba4 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-2950-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3548-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:1022-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1028-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1024-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10069-1 ctdb-4.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1023-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2016-0612 Critical: samba and samba4 security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 12, 2016
References
- SSA:2016-106-02 vendor-advisory
- SUSE-SU-2016:1022 vendor-advisory
- RHSA-2016:0612 vendor-advisory
- USN-2950-1 vendor-advisory
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05166182
- SUSE-SU-2016:1028 vendor-advisory
- RHSA-2016:0613 vendor-advisory
- http://badlock.org/
- RHSA-2016:0621 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- openSUSE-SU-2016:1064 vendor-advisory
- USN-2950-5 vendor-advisory
- https://www.samba.org/samba/history/samba-4.2.10.html
- FEDORA-2016-be53260726 vendor-advisory
- RHSA-2016:0624 vendor-advisory
- RHSA-2016:0618 vendor-advisory
- 86002 vdb-entry
- SUSE-SU-2016:1024 vendor-advisory
- SUSE-SU-2016:1023 vendor-advisory
- https://www.samba.org/samba/security/CVE-2016-2118.html
- https://www.samba.org/samba/latest_news.html#4.4.2
- 1035533 vdb-entry
- FEDORA-2016-48b3761baa vendor-advisory
- VU#813296 third-party-advisory
- RHSA-2016:0614 vendor-advisory
- https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes
- openSUSE-SU-2016:1025 vendor-advisory
- RHSA-2016:0620 vendor-advisory
- RHSA-2016:0611 vendor-advisory
- openSUSE-SU-2016:1106 vendor-advisory
- https://bto.bluecoat.com/security-advisory/sa122
- USN-2950-3 vendor-advisory
- FEDORA-2016-383fce04e2 vendor-advisory
- openSUSE-SU-2016:1107 vendor-advisory
- RHSA-2016:0619 vendor-advisory
- GLSA-201612-47 vendor-advisory
- DSA-3548 vendor-advisory
- RHSA-2016:0623 vendor-advisory
- USN-2950-2 vendor-advisory
- https://access.redhat.com/security/vulnerabilities/badlock
- RHSA-2016:0625 vendor-advisory
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40196
- USN-2950-4 vendor-advisory
- https://kb.netapp.com/support/s/article/ka51A0000008SXzQAM/smb-vulnerabilities-in-multiple-netapp-products