The Saxon XSLT parser in Google Mini Search Appliance, and possibly Google Search Appliance, allows remote attackers to obtain sensitive information and execute arbitrary code via dangerous Java class methods in select attribute of xsl:value-of tags in XSLT style sheets, such as (1) system-property, (2) sys:getProperty, and (3) run:exec.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-3752
http://www.vupen.com/english/advisories/2005/2500
http://www.securityfocus.com/bid/15509
http://www.securityfocus.com/archive/1/417310/30/0/threaded
http://securitytracker.com/id?1015246
http://secunia.com/advisories/17644
http://metasploit.com/research/vulns/google_proxystylesheet/