The unpack_zip function in archive_unpacker.rb in the sprout gem 0.7.246 for Ruby allows context-dependent attackers to execute arbitrary commands via shell metacharacters in a (1) filename or (2) path.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-6421
• http://vapid.dhs.org/advisories/sprout-0.7.246-command-inj.html
• http://www.openwall.com/lists/oss-security/2013/12/03/1
• http://www.openwall.com/lists/oss-security/2013/12/03/6
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sprout/CVE-2013-6421.yml
• http://archives.neohapsis.com/archives/bugtraq/2013-12/0077.html