# CVE-2012-3436: Null dereference in n/a

> Remote attackers can crash the OpenTTD server by sending specific requests to clear water tiles with railtracks, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Oct 2012
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2012-3436, GHSA-jh92-gg4f-jqfw

## What is CVE-2012-3436?

CVE-2012-3436 is a medium-severity vulnerability in n/a, published on 9 Oct 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OpenTTD 0.6.0 through 1.2.1 does not properly validate requests to clear a water tile, which allows remote attackers to cause a denial of service (NULL pointer dereference and server crash) via a certain sequence of steps related to "the water/coast aspect of tiles which also have railtracks on one half."

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2012-3436?

It affects 1 product.


Products: Openttd Openttd.

## How do I fix CVE-2012-3436?

Upgrade to a fixed version.

## Is CVE-2012-3436 being exploited?

There is no known exploitation of CVE-2012-3436 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2008-3576](https://insights.sbomify.com/CVE-2008-3576/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-3547](https://insights.sbomify.com/CVE-2008-3547/): Memory corruption in n/a (critical 9.0)
- [CVE-2011-3341](https://insights.sbomify.com/CVE-2011-3341/): Integer overflow in n/a (high 7.5)
- [CVE-2011-3342](https://insights.sbomify.com/CVE-2011-3342/): Memory corruption in n/a (high 7.5)
- [CVE-2005-2764](https://insights.sbomify.com/CVE-2005-2764/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-3436 and fix it if it is affected.

What it is: CVE-2012-3436 is a medium-severity vulnerability in n/a, published on 9 Oct 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2012-3436 in the wild and no public exploit code.

Affected product: n/a. 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-2012-3436/ (Markdown: https://insights.sbomify.com/CVE-2012-3436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-3436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-3436
- OSV: https://osv.dev/vulnerability/CVE-2012-3436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-3436/
Summaries are generated and may contain mistakes; the official description above is the record.