Incomplete blacklist vulnerability in Rockliffe MailSite Express before 6.1.22 allows remote attackers to upload and execute arbitrary script files by giving the files specific extensions, such as (1) .unk, (2) .asa, and possibly (3) .htr and (4) .aspx, which are not filtered like the .asp extension.
archives.neohapsis.com/archives/fulldisclosure/2005-10/0578.html
marc.info/?l=bugtraq&m=113053680631151&w=2
secunia.com/advisories/17240/
securitytracker.com/id?1015117
www.security-assessment.com/Advisories/Rockliffe_Express_Webmail_Vulnerabilities.pdf
www.securityfocus.com/bid/15230
exchange.xforce.ibmcloud.com/vulnerabilities/22907