# CVE-1999-0143: Auth bypass in n/a

> Kerberos 4 key servers allow authenticated users to masquerade as others by breaking and generating session keys.

- **Severity:** Medium 4.6 (`AV:L/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Sep 1999
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-vhvw-7mgj-5p4w

## What is CVE-1999-0143?

CVE-1999-0143 is a medium-severity authentication bypass vulnerability in Mit Kerberos 5, published on 29 Sep 1999. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Kerberos 4 key servers allow a user to masquerade as another by breaking and generating session keys.

## Which versions are affected by CVE-1999-0143?

It affects 4 products.


Products: Mit Kerberos, Mit Kerberos 5, Process Software Multinet, Sun Sunos.

## How do I fix CVE-1999-0143?

No fix has been published for CVE-1999-0143 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0143 being exploited?

There is no known exploitation of CVE-1999-0143 in the wild and no public exploit code.

## Other vulnerabilities in Mit Kerberos 5

- [CVE-2009-4212](https://insights.sbomify.com/CVE-2009-4212/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0523](https://insights.sbomify.com/CVE-2004-0523/): Memory corruption in n/a (critical 10.0)
- [CVE-2010-0283](https://insights.sbomify.com/CVE-2010-0283/): Denial of service in n/a (high 7.8)
- [CVE-2018-5709](https://insights.sbomify.com/CVE-2018-5709/): Integer overflow in n/a (high 7.5)
- [CVE-2003-0138](https://insights.sbomify.com/CVE-2003-0138/): Auth bypass in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0143 and fix it if it is affected.

What it is: CVE-1999-0143 is a medium-severity authentication bypass vulnerability in Mit Kerberos 5, published on 29 Sep 1999. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-1999-0143 in the wild and no public exploit code.

Affected product: Mit Kerberos 5. 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-1999-0143/ (Markdown: https://insights.sbomify.com/CVE-1999-0143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0143
- OSV: https://osv.dev/vulnerability/CVE-1999-0143

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0143/
Summaries are generated and may contain mistakes; the official description above is the record.