CVE-2002-0515 Information

Description

IPFilter 3.4.25 and earlier sets a different TTL when a port is being filtered than when it is not being filtered which allows remote attackers to identify filtered ports by comparing TTLs.

Reference

http://www.iss.net/security_center/static/8738.php http://www.securityfocus.com/archive/1/265188 http://www.securityfocus.com/bid/4403