The sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13, when running in verbose mode on platforms for which char is signed, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an SSL X.509 certificate containing non-printable characters with the high bit set, which triggers a heap-based buffer overflow during escaping.
mknod.org/svn/fetchmail/branches/BRANCH_6-3/fetchmail-SA-2010-01.txt
osvdb.org/62114
secunia.com/advisories/38391
www.fetchmail.info/fetchmail-SA-2010-01.txt
www.mandriva.com/security/advisories?name=MDVSA-2010:037
www.securityfocus.com/bid/38088
www.securitytracker.com/id?1023543
www.vupen.com/english/advisories/2010/0296