SilverCity before 0.9.5-r1 installs (1) cgi-styler-form.py, (2) cgi-styler.py, and (3) source2html.py with read and write world permissions, which allows local users to execute arbitrary code.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1943
http://www.gentoo.org/security/en/glsa/glsa-200506-05.xml
http://securitytracker.com/id?1014153