# CVE-2016-2124: Information disclosure in samba

> An attacker can retrieve plaintext passwords sent over the wire during SMB1 authentication, even when Kerberos is required.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Feb 2022
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2016-2124, AZL-36986, AZL-8649, DEBIAN-CVE-2016-2124, ECHO-e919-1845-5db0, GHSA-p5c7-5xj7-x9vv, UBUNTU-CVE-2016-2124

## What is CVE-2016-2124?

CVE-2016-2124 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 18 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2016-2124?

It affects 24 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Redhat Codeready Linux Builder, Redhat Enterprise Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux for Ibm Z Systems, Redhat Enterprise Linux for Ibm Z Systems Eus, Redhat Enterprise Linux for Power Big Endian, Redhat Enterprise Linux for Power Little Endian, Redhat Enterprise Linux for Power Little Endian Eus, Redhat Enterprise Linux for Scientific Computing, Redhat Enterprise Linux Resilient Storage, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Server Update Services for Sap Solutions, Redhat Enterprise Linux Tus, Redhat Enterprise Linux Workstation and 4 more.

## How do I fix CVE-2016-2124?

Apply the vendor's patch.

## Is CVE-2016-2124 being exploited?

There is no known exploitation of CVE-2016-2124 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-2124 and fix it if it is affected.

What it is: CVE-2016-2124 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 18 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-2124 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2016-2124/ (Markdown: https://insights.sbomify.com/CVE-2016-2124/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-2124
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-2124
- OSV: https://osv.dev/vulnerability/CVE-2016-2124

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-2124/
Summaries are generated and may contain mistakes; the official description above is the record.