New Ruby 4.0 Universal RCE Vulnerability Discovered

TL;DR. A security researcher has unveiled a universal Remote Code Execution (RCE) vulnerability in Ruby 4.0, using a deserialization gadget chain. This new method allows command execution via a single Marshal.load operation, potentially impacting various Ruby applications. The vulnerability combines novel and repurposed gadgets, offering a fresh exploitation vector. Patches or mitigation strategies for Ruby 4.0 systems are now critical.

• A universal RCE deserialization gadget chain has been found in Ruby 4.0.
• The exploit enables command execution through a single Marshal.load function call.
• The method utilizes new and re-contextualized gadgets for broader applicability.
• Ruby 4.0 developers must address this critical security flaw quickly.

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