# CVE-2018-1140: Denial of service in samba

> An attacker can cause a denial of service against a Samba server acting as an Active Directory Domain Controller due to missing input sanitization in the LDP database.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Aug 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-1140, DEBIAN-CVE-2018-1140, ECHO-de15-31c1-c2e8, GHSA-7rxg-m3xw-pq9p

## What is CVE-2018-1140?

CVE-2018-1140 is a medium-severity denial of service vulnerability in Samba Samba, published on 22 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A missing input sanitization flaw was found in the implementation of LDP database used for the LDAP server. An attacker could use this flaw to cause a denial of service against a samba server, used as a Active Directory Domain Controller. All versions of Samba from 4.8.0 onwards are vulnerable

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-1140?

It affects 1 product.


Products: Samba Samba.

## How do I fix CVE-2018-1140?

Apply the vendor's patch.

## Is CVE-2018-1140 being exploited?

There is no known exploitation of CVE-2018-1140 in the wild and no public exploit code.

## Other vulnerabilities in Samba Samba

- [CVE-2012-1182](https://insights.sbomify.com/CVE-2012-1182/): Integer overflow in n/a (critical 10.0)
- [CVE-2007-2446](https://insights.sbomify.com/CVE-2007-2446/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0600](https://insights.sbomify.com/CVE-2004-0600/): Memory corruption in n/a (critical 10.0)
- [CVE-1999-0810](https://insights.sbomify.com/CVE-1999-0810/): Denial of service in n/a (critical 10.0)
- [CVE-1999-0182](https://insights.sbomify.com/CVE-1999-0182/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1140 and fix it if it is affected.

What it is: CVE-2018-1140 is a medium-severity denial of service vulnerability in Samba Samba, published on 22 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1140 in the wild and no public exploit code.

Affected product: Samba Samba. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-1140/ (Markdown: https://insights.sbomify.com/CVE-2018-1140/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1140
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1140
- OSV: https://osv.dev/vulnerability/CVE-2018-1140

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1140/
Summaries are generated and may contain mistakes; the official description above is the record.