Description
Alchemy is an open source content management system engine written in Ruby on Rails. Prior to versions 7.4.12 and 8.0.3, the application uses the Ruby `eval()` function to dynamically execute a string provided by the `resource_handler.engine_name` attribute in `Alchemy::ResourcesHelper#resource_url_proxy`. The vulnerability exists in `app/helpers/alchemy/resources_helper.rb` at line 28. The code explicitly bypasses security linting with `# rubocop:disable Security/Eval`, indicating that the use of a dangerous function was known but not properly mitigated. Since `engine_name` is sourced from module definitions that can be influenced by administrative configurations, it allows an authenticated attacker to escape the Ruby sandbox and execute arbitrary system commands on the host OS. Versions 7.4.12 and 8.0.3 fix the issue by replacing `eval()` with `send()`.
Problem types
CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Product status
>= 8.0.0.a, < 8.0.3
References
github.com/...my_cms/security/advisories/GHSA-2762-657x-v979
github.com/...ommit/55d03ec600fd9e07faae1138b923790028917d26
github.com/...ommit/563c4ce45bf5813b7823bf3403ca1fc32cb769e7
github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.12
github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.3