Unspecified vulnerability in PEAR installer 1.4.2 and earlier allows user-assisted attackers to execute arbitrary code via a crafted package that can execute code when the pear command is executed or when the Web/Gtk frontend is loaded.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23021
http://www.vupen.com/english/advisories/2005/2444
http://securitytracker.com/alerts/2005/Nov/1015161.html