# CVE-2009-2426: Server-side request forgery in n/a

> Exit relays can force Tor controllers to accept DNS responses redirecting to internal IPs, enabling Server-Side Request Forgery attacks.

- **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:** 10 Jul 2009
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2009-2426, GHSA-r3c9-qr4c-gm4p

## What is CVE-2009-2426?

CVE-2009-2426 is a medium-severity server-side request forgery vulnerability in Tor Tor, published on 10 Jul 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The connection_edge_process_relay_cell_not_open function in src/or/relay.c in Tor 0.2.x before 0.2.0.35 and 0.1.x before 0.1.2.8-beta allows exit relays to have an unspecified impact by causing controllers to accept DNS responses that redirect to an internal IP address via unknown vectors.  NOTE: some of these details are obtained from third party information.

## Which versions are affected by CVE-2009-2426?

It affects 1 product.


Products: Tor Tor.

## How do I fix CVE-2009-2426?

Upgrade to a fixed version.

## Is CVE-2009-2426 being exploited?

There is no known exploitation of CVE-2009-2426 in the wild and no public exploit code.

## Other vulnerabilities in Tor Tor

- [CVE-2010-1676](https://insights.sbomify.com/CVE-2010-1676/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-0939](https://insights.sbomify.com/CVE-2009-0939/): Tor before 0.2.0.34 treats incomplete IPv4 addresses as valid, which has unknown impact and attack vectors related to "Spec conformance," as (critical 10.0)
- [CVE-2009-0414](https://insights.sbomify.com/CVE-2009-0414/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-5398](https://insights.sbomify.com/CVE-2008-5398/): Information disclosure in n/a (critical 9.3)
- [CVE-2011-2778](https://insights.sbomify.com/CVE-2011-2778/): Memory corruption in n/a (high 7.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-2426 and fix it if it is affected.

What it is: CVE-2009-2426 is a medium-severity server-side request forgery vulnerability in Tor Tor, published on 10 Jul 2009. 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-2009-2426 in the wild and no public exploit code.

Affected product: Tor Tor. 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-2009-2426/ (Markdown: https://insights.sbomify.com/CVE-2009-2426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-2426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-2426
- OSV: https://osv.dev/vulnerability/CVE-2009-2426

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-2426/
Summaries are generated and may contain mistakes; the official description above is the record.