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CVE-2016-2118

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."

Published:Apr 12, 2016

Last Modified:Apr 12, 2025

EPS:Apr 12, 2016

EPSS Score:0.78649

CVSS Score:7.5

Affected Products

Vendor

Product

Action

Vendor

Canonical

Product

Ubuntu Linux

Canonical

Ubuntu Linux

Vendor

Debian

Product

Debian Linux

Debian

Debian Linux

Vendor

Redhat

Product

Enterprise Linux

Redhat

Enterprise Linux

Vendor

Redhat

Product

Rhel Aus

Redhat

Rhel Aus

Vendor

Redhat

Product

Rhel Els

Redhat

Rhel Els

Vendor

Redhat

Product

Rhel Eus

Redhat

Rhel Eus

Vendor

Redhat

Product

Rhel Mission Critical

Redhat

Rhel Mission Critical

Vendor

Redhat

Product

Storage

Redhat

Storage

Vendor

Samba

Product

Samba

Samba

Samba

Exploits

https://github.com/nickanderson/cfengine-CVE-2016-2118

Common Weakness Enumeration

CWE-300 Channel Accessible by Non-Endpoint

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-466 Leveraging Active Adversary in the Middle Attacks to Bypass Same Origin Policy

CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data

CAPEC-589 DNS Blocking

CAPEC-590 IP Address Blocking

CAPEC-612 WiFi MAC Address Tracking

CAPEC-613 WiFi SSID Tracking

CAPEC-615 Evil Twin Wi-Fi Attack

CAPEC-662 Adversary in the Browser (AiTB)

CAPEC-94 Adversary in the Middle (AiTM)

Related CVEs

CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…

CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…

CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …

CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…

CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…

CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…

CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…

CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…

CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…

CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

References

http://badlock.org/

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.html

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.html

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html

http://rhn.redhat.com/errata/RHSA-2016-0611.html

http://rhn.redhat.com/errata/RHSA-2016-0612.html

http://rhn.redhat.com/errata/RHSA-2016-0613.html

http://rhn.redhat.com/errata/RHSA-2016-0614.html

http://rhn.redhat.com/errata/RHSA-2016-0618.html

http://rhn.redhat.com/errata/RHSA-2016-0619.html

http://rhn.redhat.com/errata/RHSA-2016-0620.html

http://rhn.redhat.com/errata/RHSA-2016-0621.html

http://rhn.redhat.com/errata/RHSA-2016-0623.html

http://rhn.redhat.com/errata/RHSA-2016-0624.html

http://rhn.redhat.com/errata/RHSA-2016-0625.html

http://www.debian.org/security/2016/dsa-3548

http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

http://www.securityfocus.com/bid/86002

http://www.securitytracker.com/id/1035533

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012

http://www.ubuntu.com/usn/USN-2950-1

http://www.ubuntu.com/usn/USN-2950-2

http://www.ubuntu.com/usn/USN-2950-3

http://www.ubuntu.com/usn/USN-2950-4

http://www.ubuntu.com/usn/USN-2950-5

https://access.redhat.com/security/vulnerabilities/badlock

https://bto.bluecoat.com/security-advisory/sa122

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05166182

https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes

https://kb.netapp.com/support/s/article/ka51A0000008SXzQAM/smb-vulnerabilities-in-multiple-netapp-products

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40196

https://security.gentoo.org/glsa/201612-47

https://www.kb.cert.org/vuls/id/813296

https://www.samba.org/samba/history/samba-4.2.10.html

https://www.samba.org/samba/latest_news.html#4.4.2

https://www.samba.org/samba/security/CVE-2016-2118.html

http://badlock.org/

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.html

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.html

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html

http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html

http://rhn.redhat.com/errata/RHSA-2016-0611.html

http://rhn.redhat.com/errata/RHSA-2016-0612.html

http://rhn.redhat.com/errata/RHSA-2016-0613.html

http://rhn.redhat.com/errata/RHSA-2016-0614.html

http://rhn.redhat.com/errata/RHSA-2016-0618.html

http://rhn.redhat.com/errata/RHSA-2016-0619.html

http://rhn.redhat.com/errata/RHSA-2016-0620.html

http://rhn.redhat.com/errata/RHSA-2016-0621.html

http://rhn.redhat.com/errata/RHSA-2016-0623.html

http://rhn.redhat.com/errata/RHSA-2016-0624.html

http://rhn.redhat.com/errata/RHSA-2016-0625.html

http://www.debian.org/security/2016/dsa-3548

http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

http://www.securityfocus.com/bid/86002

http://www.securitytracker.com/id/1035533

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012

http://www.ubuntu.com/usn/USN-2950-1

http://www.ubuntu.com/usn/USN-2950-2

http://www.ubuntu.com/usn/USN-2950-3

http://www.ubuntu.com/usn/USN-2950-4

http://www.ubuntu.com/usn/USN-2950-5

https://access.redhat.com/security/vulnerabilities/badlock

https://bto.bluecoat.com/security-advisory/sa122

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05166182

https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes

https://kb.netapp.com/support/s/article/ka51A0000008SXzQAM/smb-vulnerabilities-in-multiple-netapp-products

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40196

https://security.gentoo.org/glsa/201612-47

https://www.kb.cert.org/vuls/id/813296

https://www.samba.org/samba/history/samba-4.2.10.html

https://www.samba.org/samba/latest_news.html#4.4.2

https://www.samba.org/samba/security/CVE-2016-2118.html

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High