# CVE-2001-1013: Information disclosure in n/a

> Remote attackers can enumerate valid usernames on Apache servers with UserDir enabled due to distinct error codes for existing versus non-existing users.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:P/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Feb 2002
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-ww47-4c2p-jhj9

## What is CVE-2001-1013?

CVE-2001-1013 is a medium-severity vulnerability in Redhat Linux, published on 2 Feb 2002. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Apache on Red Hat Linux with with the UserDir directive enabled generates different error codes when a username exists and there is no public_html directory and when the username does not exist, which could allow remote attackers to determine valid usernames on the server.

## Which versions are affected by CVE-2001-1013?

It affects 1 product.


Products: Redhat Linux.

## How do I fix CVE-2001-1013?

No fix has been published for CVE-2001-1013 yet. Limit exposure of the affected software until one is available.

## Is CVE-2001-1013 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2001-1013 exists.

Public exploit code:

- RedHat Linux 7.0 Apache - Remote Username Enumeration (exploitdb)
- Apache "mod_userdir" User Enumeration (metasploit)

## Other vulnerabilities in Redhat Linux

- [CVE-2000-1220](https://insights.sbomify.com/CVE-2000-1220/): Privilege escalation in n/a (critical 10.0)
- [CVE-2003-0248](https://insights.sbomify.com/CVE-2003-0248/): Privilege escalation in n/a (critical 10.0)
- [CVE-1999-1542](https://insights.sbomify.com/CVE-1999-1542/): Command injection in n/a (critical 10.0)
- [CVE-1999-1299](https://insights.sbomify.com/CVE-1999-1299/): Privilege escalation in n/a (critical 10.0)
- [CVE-2000-0322](https://insights.sbomify.com/CVE-2000-0322/): Command injection in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2001-1013 and fix it if it is affected.

What it is: CVE-2001-1013 is a medium-severity vulnerability in Redhat Linux, published on 2 Feb 2002. 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-2001-1013 exists.

Affected product: Redhat 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-2001-1013/ (Markdown: https://insights.sbomify.com/CVE-2001-1013/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2001-1013
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2001-1013
- OSV: https://osv.dev/vulnerability/CVE-2001-1013

---
From sbomify Insights: https://insights.sbomify.com/CVE-2001-1013/
Summaries are generated and may contain mistakes; the official description above is the record.