# CVE-2022-3437: Memory corruption in samba

> A heap-based buffer overflow in Samba's Heimdal GSSAPI routines allows remote attackers to cause a denial of service via malicious packets.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **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:** 12 Jan 2023
- **Updated:** 28 Oct 2024
- **Also known as:** ALPINE-CVE-2022-3437, AZL-12995, AZL-37016, CLEANSTART-2024-BZ36226, CLSA-2023-1675372486, CLSA-2023-1703011710, DEBIAN-CVE-2022-3437, ECHO-5108-c1c2-e92d, OESA-2022-2038, UBUNTU-CVE-2022-3437

## What is CVE-2022-3437?

CVE-2022-3437 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 12 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal. The DES and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet. This flaw allows a remote user to send specially crafted malicious data to the application, possibly resulting in a denial of service (DoS) attack.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2022-3437?

It affects 2 products.


Products: Fedoraproject Fedora, Samba Samba.

## How do I fix CVE-2022-3437?

Apply the vendor's patch.

## Is CVE-2022-3437 being exploited?

There is no known exploitation of CVE-2022-3437 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3437 and fix it if it is affected.

What it is: CVE-2022-3437 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 12 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-3437 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2022-3437/ (Markdown: https://insights.sbomify.com/CVE-2022-3437/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3437
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3437
- OSV: https://osv.dev/vulnerability/CVE-2022-3437

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3437/
Summaries are generated and may contain mistakes; the official description above is the record.