CVE-2019-18409: Incorrect Permission Assignment for Critical Resource

October 24, 2019 (updated October 30, 2019)

The ruby_parser-legacy (aka legacy) gem for Ruby allows local privilege escalation because of world-writable files. For example, if the brakeman gem (which has a legacy dependency), a local user can insert malicious code into the ruby_parser-legacy-1.0.0/lib/ruby_parser/legacy/ruby_parser.rb file.

References

github.com/zenspider/ruby_parser-legacy/issues/1
nvd.nist.gov/vuln/detail/CVE-2019-18409

Code Behaviors & Features

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