The DNS map code in Sendmail 8.12.8 and earlier, when using the “enhdnsbl” feature, does not properly initialize certain data structures, which allows remote attackers to cause a denial of service (process crash) via an invalid DNS response that causes Sendmail to free incorrect data.
ftp://patches.sgi.com/support/free/security/advisories/20030803-01-P
distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000727
www.kb.cert.org/vuls/id/993452
www.mandriva.com/security/advisories?name=MDKSA-2003:086
www.novell.com/linux/security/advisories/2003_035_sendmail.html
www.redhat.com/support/errata/RHSA-2003-265.html
www.sendmail.org/dnsmap1.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A597