# CVE-2007-4000: Memory corruption in n/a

> Remote authenticated users with modify policy privileges can execute arbitrary code via a write to an uninitialized pointer in the Kerberos administration daemon.

- **Severity:** High 8.5 (`AV:N/AC:M/Au:S/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Sep 2007
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-4000, GHSA-rjp4-vqhr-2249

## What is CVE-2007-4000?

CVE-2007-4000 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 5 Sep 2007. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The kadm5_modify_policy_internal function in lib/kadm5/srv/svr_policy.c in the Kerberos administration daemon (kadmind) in MIT Kerberos 5 (krb5) 1.5 through 1.6.2 does not properly check return values when the policy does not exist, which might allow remote authenticated users with the "modify policy" privilege to execute arbitrary code via unspecified vectors that trigger a write to an uninitialized pointer.

Weakness: CWE-824 (Access of Uninitialized Pointer)

## Which versions are affected by CVE-2007-4000?

It affects 2 products.


Products: Fedoraproject Fedora, Mit Kerberos 5.

## How do I fix CVE-2007-4000?

Upgrade to a fixed version.

## Is CVE-2007-4000 being exploited?

There is no known exploitation of CVE-2007-4000 in the wild and no public exploit code.

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- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4000 and fix it if it is affected.

What it is: CVE-2007-4000 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 5 Sep 2007. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2007-4000 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2007-4000/ (Markdown: https://insights.sbomify.com/CVE-2007-4000/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4000
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4000
- OSV: https://osv.dev/vulnerability/CVE-2007-4000

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4000/
Summaries are generated and may contain mistakes; the official description above is the record.