Other nomination

Universal Deserialisation Gadget for Ruby 2.x-3.x

A gadget chain built only from Ruby's default classes turns an untrusted Marshal.load into arbitrary command execution, running from Gem::Requirement through Gem::Package::TarReader and Net::BufferedIO to Net::WriteAdapter, which calls any chosen method on any object. It replaces the earlier gadget patched in Ruby 2.7 and works from Ruby 2.0 to 3.0 with no extra gems loaded.

Record

Date

7 January 2021

In the archive

• Nominated for the 2021 Top 10 Web Hacking Techniques

Tags

• deserialization
• gadget-chain
• rce
• ruby
• rails
• prior-art-extension
• owasp-a08-2021

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