# CVE-2024-27302: Authorization Bypass Through User-Controlled Key in go-zero

> Attackers can bypass CORS restrictions in go-zero by using malicious domains, allowing unauthorized data retrieval on behalf of other users.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Mar 2024
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fgxv-gw55-r5fq, GO-2024-2604

## What is CVE-2024-27302?

CVE-2024-27302 is a critical vulnerability in zeromicro go-zero, published on 6 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

go-zero is a web and rpc framework. Go-zero allows user to specify a CORS Filter with a configurable allows param - which is an array of domains allowed in CORS policy. However, the `isOriginAllowed` uses `strings.HasSuffix` to check the origin, which leads to bypass via a malicious domain. This vulnerability is capable of breaking CORS policy and thus allowing any page to make requests and/or retrieve data on behalf of other users. Version 1.4.4 fixes this issue.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2024-27302?

3 open source packages ship an affected version, including github.com/zeromicro/go-zero. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/zeromicro/go-zero` | Go | All versions | 1.4.4 |
| `github.com/zeromicro/go-zero` | Go | All versions | 1.4.4 |
| `github.com/zeromicro/go-zero` | Go | All versions | 1.4.4 |

Products: Go-Zero Go-Zero.

## How do I fix CVE-2024-27302?

Upgrade github.com/zeromicro/go-zero to 1.4.4 or later.

## Is CVE-2024-27302 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-27302 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-27302 and fix it if it is affected.

What it is: CVE-2024-27302 is a critical vulnerability in zeromicro go-zero, published on 6 Mar 2024. 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-2024-27302 exists.

Affected packages and fixed versions:
- github.com/zeromicro/go-zero (Go): affected all versions; fixed in 1.4.4
- github.com/zeromicro/go-zero (Go): affected all versions; fixed in 1.4.4
- github.com/zeromicro/go-zero (Go): affected all versions; fixed in 1.4.4

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-2024-27302/ (Markdown: https://insights.sbomify.com/CVE-2024-27302/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27302
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27302
- OSV: https://osv.dev/vulnerability/CVE-2024-27302

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-27302/
Summaries are generated and may contain mistakes; the official description above is the record.