The getmxrecord function in Fetchmail 6.0.0 and earlier does not properly check the boundary of a particular malformed DNS packet from a malicious DNS server, which allows remote attackers to cause a denial of service (crash) when Fetchmail attempts to read data beyond the expected boundary.
distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000531
marc.info/?l=bugtraq&m=103340148625187&w=2
rhn.redhat.com/errata/RHSA-2002-215.html
www.debian.org/security/2002/dsa-171
www.iss.net/security_center/static/10203.php
www.linux-mandrake.com/en/security/2002/MDKSA-2002-063.php
www.linuxsecurity.com/advisories/other_advisory-2402.html
www.securityfocus.com/bid/5826