A critical vulnerability in Erlang's Open Telecom Platform (OTP) SSH implementation has recently been published. OTP is a collection of middleware, libraries and tools written in the Erlang programming language and is used by a large number of global companies for communications. According to , companies that may be affected include Ericsson, T-Mobile, BT and Bet365 (that reportedly use it in it's live betting infrastructure) and major products that may be affected include WhatsApp, Klarna and Discord.
The vulnerability has the highest severity possible with a CVSS score of 10 out of 10. This is likely because it may allow an attacker to perform unauthenticated remote code execution on a target server. The attack complexity has been described at low, meaning exploitation is likely trivial. Any network facing server with the Erlang OTP implementation of SSH enabled that isn't version OTP-27.3.3, OTP-26.2.5.11 or OTP-25.3.2.20 should be considered vulnerable. The current recommendation is to either update to these versions, or disabling the SSH server or access to it temporarily until it's patched.
If you are currently or have been vulnerable to this exploitation, please feel free to reach out to Integrity360 for more advice. We are monitoring the situation and will provide more updates as they arise.