# GHSA-w228-rfpx-fhm4: cg vulnerable to an Open Redirect Vulnerability on Referer Header

> An attacker can redirect users to malicious sites via the Referer header, enabling phishing or malware distribution.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 23 Apr 2024

## What is GHSA-w228-rfpx-fhm4?

GHSA-w228-rfpx-fhm4 is a vulnerability in cg, published on 23 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

### Summary

A vulnerability has been discovered in the handling of the referrer header in the application, which could allow an attacker to conduct open redirects. The issue arises from improper validation of the referrer header in certain conditions. By manipulating the referrer header, an attacker could potentially redirect users to malicious websites, phishing pages, or other dangerous destinations.

### PoC

If you change the referer header, you will be redirected to that domain without verifying.

https://github.com/Clinical-Genomics/cg/blob/master/cg/server/invoices/views.py#L173

### Impact

An attacker exploiting this vulnerability could trick users into visiting malicious websites or disclose sensitive information by redirecting them to unintended destinations. This could lead to various attacks including phishing, malware distribution, or further exploitation of other vulnerabilities.

## Which versions are affected by GHSA-w228-rfpx-fhm4?

2 open source packages ship an affected version, including cg.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `cg` | PyPI | All versions | 60.2.12 |
| `cg` | PyPI | All versions | 60.2.12 |

## How do I fix GHSA-w228-rfpx-fhm4?

Upgrade cg to 60.2.12 or later.

## Is GHSA-w228-rfpx-fhm4 being exploited?

There is no known exploitation of GHSA-w228-rfpx-fhm4 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-w228-rfpx-fhm4 and fix it if it is affected.

What it is: GHSA-w228-rfpx-fhm4 is a vulnerability in cg, published on 23 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of GHSA-w228-rfpx-fhm4 in the wild and no public exploit code.

Affected packages and fixed versions:
- cg (PyPI): affected all versions; fixed in 60.2.12
- cg (PyPI): affected all versions; fixed in 60.2.12

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/GHSA-w228-rfpx-fhm4/ (Markdown: https://insights.sbomify.com/GHSA-w228-rfpx-fhm4/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-w228-rfpx-fhm4

---
From sbomify Insights: https://insights.sbomify.com/GHSA-w228-rfpx-fhm4/
Summaries are generated and may contain mistakes; the official description above is the record.