# CVE-2010-1938: Integer overflow in n/a

> Remote attackers can cause a denial of service or execute arbitrary code via a long username due to an off-by-one error in the OPIE library.

- **Severity:** Critical 9.3 (`AV:N/AC:M/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 May 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-grpr-f38p-j58f

## What is CVE-2010-1938?

CVE-2010-1938 is a critical vulnerability in Freebsd Freebsd, published on 28 May 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Off-by-one error in the __opiereadrec function in readrec.c in libopie in OPIE 2.4.1-test1 and earlier, as used on FreeBSD 6.4 through 8.1-PRERELEASE and other platforms, allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via a long username, as demonstrated by a long USER command to the FreeBSD 8.0 ftpd.

Weakness: CWE-189

## Which versions are affected by CVE-2010-1938?

It affects 2 products.


Products: Freebsd Freebsd, Nrl Opie.

## How do I fix CVE-2010-1938?

No fix has been published for CVE-2010-1938 yet. Limit exposure of the affected software until one is available.

## Is CVE-2010-1938 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1938 exists.

Public exploit code:

- A simple Python script to test an off-by-one vulnerability in the OPIE library (CVE-2010-1938). This vulnerability affects certain FTP servers and may allow for Denial of Service (DoS) or arbitrary code execution. (github_poc): https://github.com/Nexxus67/cve-2010-1938
- FreeBSD 8.0 - 'ftpd' (FreeBSD-SA-10:05) Off-By-One (PoC) (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-2010-1938 and fix it if it is affected.

What it is: CVE-2010-1938 is a critical vulnerability in Freebsd Freebsd, published on 28 May 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1938 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-2010-1938/ (Markdown: https://insights.sbomify.com/CVE-2010-1938/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-1938
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-1938
- OSV: https://osv.dev/vulnerability/CVE-2010-1938

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-1938/
Summaries are generated and may contain mistakes; the official description above is the record.