# CVE-2019-19344: Use after free in samba

> A use-after-free flaw in Samba allows attackers to potentially execute arbitrary code or cause a denial of service via crafted requests.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jan 2020
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2019-19344, DEBIAN-CVE-2019-19344, ECHO-3782-fa30-3960, GHSA-932g-58jj-wp5q

## What is CVE-2019-19344?

CVE-2019-19344 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

There is a use-after-free issue in all samba 4.9.x versions before 4.9.18, all samba 4.10.x versions before 4.10.12 and all samba 4.11.x versions before 4.11.5, essentially due to a call to realloc() while other local variables still point at the original buffer.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2019-19344?

It affects 7 products.


Products: Canonical Ubuntu Linux, Opensuse Leap, Samba Samba, Synology Directory Server, Synology Diskstation Manager, Synology Router Manager, Synology Skynas.

## How do I fix CVE-2019-19344?

Upgrade to a fixed version.

## Is CVE-2019-19344 being exploited?

There is no known exploitation of CVE-2019-19344 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-2019-19344 and fix it if it is affected.

What it is: CVE-2019-19344 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-19344 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-2019-19344/ (Markdown: https://insights.sbomify.com/CVE-2019-19344/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19344
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19344
- OSV: https://osv.dev/vulnerability/CVE-2019-19344

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19344/
Summaries are generated and may contain mistakes; the official description above is the record.