Verity Ultraseek before 5.2.2 allows remote attackers to obtain the full pathname of the document root via an MS-DOS device name in the web search option, such as (1) NUL, (2) CON, (3) AUX, (4) COM1, (5) COM2, and others.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16066
http://marc.info/?l=bugtraq&m=108377388114888&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-May/020952.html
http://archives.neohapsis.com/archives/vulnwatch/2004-q2/0024.html