# CVE-2018-17157: Integer overflow in FreeBSD

> Remote unprivileged users can execute arbitrary code on FreeBSD systems via an integer overflow in the NFSv4 server implementation.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Dec 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-rpw7-85c5-fxrp

## What is CVE-2018-17157?

CVE-2018-17157 is a critical vulnerability in Freebsd Freebsd, published on 4 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In FreeBSD before 11.2-STABLE(r340854) and 11.2-RELEASE-p5, an integer overflow error when handling opcodes can cause memory corruption by sending a specially crafted NFSv4 request. Unprivileged remote users with access to the NFS server may be able to execute arbitrary code.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2018-17157?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2018-17157?

No fix has been published for CVE-2018-17157 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-17157 being exploited?

There is no known exploitation of CVE-2018-17157 in the wild and no public exploit code.

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-17157 and fix it if it is affected.

What it is: CVE-2018-17157 is a critical vulnerability in Freebsd Freebsd, published on 4 Dec 2018. 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-2018-17157 in the wild and no public exploit code.

Affected product: Freebsd Freebsd. 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-2018-17157/ (Markdown: https://insights.sbomify.com/CVE-2018-17157/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-17157
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-17157
- OSV: https://osv.dev/vulnerability/CVE-2018-17157

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-17157/
Summaries are generated and may contain mistakes; the official description above is the record.