The search function in TWiki 20030201 allows remote attackers to execute arbitrary commands via shell metacharacters in a search string.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18062
http://www.ciac.org/ciac/bulletins/p-039.shtml
http://twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWithSearch
http://security.gentoo.org/glsa/glsa-200411-33.xml
http://marc.info/?l=bugtraq&m=110037207516456&w=2
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000918
http://archives.neohapsis.com/archives/bugtraq/2004-11/0201.html