Mandriva Linux Security Advisory 2010-195 – libESMTP, probably 1.0.4 and earlier, does not properly handle a backslashed 0 field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408. The match_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4, treats two strings as equal if one is a substring of the other, which allows remote attackers to spoof trusted certificates via a crafted subjectAltName.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/94500/MDVSA-2010-195.txt
Source: https://packetstormsecurity.com/files/94500/Mandriva-Linux-Security-Advisory-2010-195.html