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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2023-37261?
It affects 1 product.
Products include 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.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2023-37261 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37261 exists.