# CVE-2024-21623: Arbitrary Expression Injection in github workflow leads to Command execution & leaking secrets

> Attackers can inject expressions in GitHub Actions to execute commands, leak secrets, and modify the repository.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jan 2024
- **Updated:** 14 Nov 2024
- **Also known as:** GHSA-q6gr-wc79-v589

## What is CVE-2024-21623?

CVE-2024-21623 is a critical code injection vulnerability in mehah otclient, published on 2 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OTCLient is an alternative tibia client for otserv. Prior to commit db560de0b56476c87a2f967466407939196dd254, the /mehah/otclient "`Analysis - SonarCloud`" workflow is vulnerable to an expression injection in Actions, allowing an attacker to run commands remotely on the runner, leak secrets, and alter the repository using this workflow. Commit db560de0b56476c87a2f967466407939196dd254 contains a fix for this issue.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2024-21623?

It affects 1 product.


Products: Mehah Otclient.

## How do I fix CVE-2024-21623?

No fix has been published for CVE-2024-21623 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-21623 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-21623 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-21623 and fix it if it is affected.

What it is: CVE-2024-21623 is a critical code injection vulnerability in mehah otclient, published on 2 Jan 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-2024-21623 exists.

Affected product: mehah otclient. 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-2024-21623/ (Markdown: https://insights.sbomify.com/CVE-2024-21623/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21623
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-21623
- OSV: https://osv.dev/vulnerability/CVE-2024-21623

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-21623/
Summaries are generated and may contain mistakes; the official description above is the record.