The "ICQ Features on Demand" functionality for Mirabilis ICQ Pro 2003a does not properly verify the authenticity of software upgrades, which allows remote attackers to install arbitrary software via a spoofing attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11944
http://www.securityfocus.com/bid/7464
http://www.coresecurity.com/common/showdoc.php?idx=315&idxseccion=10
http://marc.info/?l=bugtraq&m=105216842131995&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0051.html