CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
60.2%
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.
github.com/cc-tweaked/CC-Tweaked/security/advisories/GHSA-7p4w-mv69-2wm2
github.com/MightyPirates/OpenComputers/blob/5b2ba76a4c242b369b9b6ac6196fd04d96580ad0/src/main/resources/application.conf#L966-L986
github.com/MightyPirates/OpenComputers/blob/5b2ba76a4c242b369b9b6ac6196fd04d96580ad0/src/main/scala/li/cil/oc/Settings.scala#L614-L637
github.com/MightyPirates/OpenComputers/commit/d13c015357fd6c42e0a1bdd6e1ef9462f0450a15
github.com/MightyPirates/OpenComputers/issues/2365
github.com/MightyPirates/OpenComputers/releases/tag/1.12.2-forge%2F1.8.3
github.com/MightyPirates/OpenComputers/security/advisories/GHSA-vvfj-xh7c-j2cm