Squid 2.4 STABLE3 and earlier does not properly disable HTCP, even when "htcp_port 0" is specified in squid.conf, which could allow remote attackers to bypass intended access restrictions.
http://www.squid-cache.org/Versions/v2/2.4/bugs/
http://www.securityfocus.com/bid/4150
http://www.redhat.com/support/errata/RHSA-2002-029.html
http://www.linux-mandrake.com/en/security/2002/MDKSA-2002-016.php
http://www.iss.net/security_center/static/8261.php
http://marc.info/?l=bugtraq&m=101443252627021&w=2
http://marc.info/?l=bugtraq&m=101431040422095&w=2
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000464
http://archives.neohapsis.com/archives/linux/caldera/2002-q1/0014.html