# CVE-2010-2020: Privilege escalation in n/a

> Local attackers can escalate privileges via crafted mount requests in FreeBSD kernel NFS client when usermount is enabled.

- **Severity:** Medium 6.9 (`AV:L/AC:M/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 May 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-jxp6-x4gh-789p

## What is CVE-2010-2020?

CVE-2010-2020 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 May 2010. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

sys/nfsclient/nfs_vfsops.c in the NFS client in the kernel in FreeBSD 7.2 through 8.1-PRERELEASE, when vfs.usermount is enabled, does not validate the length of a certain fhsize parameter, which allows local users to gain privileges via a crafted mount request.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2010-2020?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2010-2020?

No fix has been published for CVE-2010-2020 yet. Limit exposure of the affected software until one is available.

## Is CVE-2010-2020 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-2020 exists.

Public exploit code:

- FreeBSD 8.0/7.3/7.2 - 'nfs_mount()' Local Privilege Escalation (exploitdb)
- FreeBSD - 'mountnfs()' Denial of Service (exploitdb)

## 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-2010-2020 and fix it if it is affected.

What it is: CVE-2010-2020 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 May 2010. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-2020 exists.

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-2010-2020/ (Markdown: https://insights.sbomify.com/CVE-2010-2020/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-2020
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-2020
- OSV: https://osv.dev/vulnerability/CVE-2010-2020

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-2020/
Summaries are generated and may contain mistakes; the official description above is the record.