# CVE-2023-37261: OpenComputers's SSRF to cloud service metadata services and local IPv6 addresses not blocked by default

> Players can access cloud metadata and local networks via SSRF in OpenComputers, potentially exposing sensitive data and enabling privilege escalation on hosting providers.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Jul 2023
- **Updated:** 18 Oct 2024

## What is CVE-2023-37261?

CVE-2023-37261 is a critical server-side request forgery vulnerability in MightyPirates OpenComputers, published on 7 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenComputers is a Minecraft mod that adds programmable computers and robots to the game. This issue affects every version of OpenComputers with the Internet Card feature enabled; that is, OpenComputers 1.2.0 until 1.8.3 in their most common, default configurations. If the OpenComputers mod is installed as part of a Minecraft server hosted on a popular cloud hosting provider, such as AWS, GCP and Azure, those metadata services' API endpoints are not forbidden (aka "blacklisted") by default. As such, any player can gain access to sensitive information exposed via those metadata servers, potentially allowing them to pivot or privilege escalate into the hosting provider. In addition, IPv6 addresses are not correctly filtered at all, allowing broader access into the local IPv6 network. This can allow a player on a server using an OpenComputers computer to access parts of the private IPv4 address space, as well as the whole IPv6 address space, in order to retrieve sensitive information.

OpenComputers v1.8.3 for Minecraft 1.7.10 and 1.12.2 contains a patch for this issue. Some workarounds are also available. One may disable the Internet Card feature completely. If using OpenComputers 1.3.0 or above, using the allow list (`opencomputers.internet.whitelist` option) will prohibit connections to any IP addresses and/or domains not listed; or one may add entries to the block list (`opencomputers.internet.blacklist` option). More information about mitigations is available in the GitHub Security Advisory.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2023-37261?

It affects 1 product.


Products: Opencomputers Opencomputers.

## How do I fix CVE-2023-37261?

No fix has been published for CVE-2023-37261 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-37261 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37261 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-37261 and fix it if it is affected.

What it is: CVE-2023-37261 is a critical server-side request forgery vulnerability in MightyPirates OpenComputers, published on 7 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37261 exists.

Affected product: MightyPirates OpenComputers. 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-2023-37261/ (Markdown: https://insights.sbomify.com/CVE-2023-37261/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37261
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37261
- OSV: https://osv.dev/vulnerability/CVE-2023-37261

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-37261/
Summaries are generated and may contain mistakes; the official description above is the record.