The self.run_gpg function in lib/rgpg/gpg_helper.rb in the rgpg gem before 0.2.3 for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in unspecified vectors.

• https://nvd.nist.gov/vuln/detail/CVE-2013-4203
• https://github.com/rcook/rgpg/commit/b819b13d198495f3ecd2762a0dbe27bb6fae3505
• http://www.openwall.com/lists/oss-security/2013/08/03/2
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rgpg/CVE-2013-4203.yml
• https://github.com/advisories/GHSA-jg4m-q6w8-vrjp