# CVE-2009-1902: Null dereference in n/a

> Remote attackers can crash ModSecurity via a malformed multipart request, causing denial of service for web applications using this firewall.

- **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:** No
- **Published:** 3 Jun 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-vj86-92j3-rr4c

## What is CVE-2009-1902?

CVE-2009-1902 is a medium-severity vulnerability in Fedoraproject Fedora, published on 3 Jun 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The multipart processor in ModSecurity before 2.5.9 allows remote attackers to cause a denial of service (crash) via a multipart form datapost request with a missing part header name, which triggers a NULL pointer dereference.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2009-1902?

It affects 2 products.


Products: Fedoraproject Fedora, Trustwave Modsecurity.

## How do I fix CVE-2009-1902?

No fix has been published for CVE-2009-1902 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-1902 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-1902 exists.

Public exploit code:

- ModSecurity < 2.5.9 - Remote Denial of Service (exploitdb)

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [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-2009-1902 and fix it if it is affected.

What it is: CVE-2009-1902 is a medium-severity vulnerability in Fedoraproject Fedora, published on 3 Jun 2009. 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-2009-1902 exists.

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-2009-1902/ (Markdown: https://insights.sbomify.com/CVE-2009-1902/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-1902
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-1902
- OSV: https://osv.dev/vulnerability/CVE-2009-1902

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-1902/
Summaries are generated and may contain mistakes; the official description above is the record.