The mime_hdr_cmp function in crypto/asn1/asn_mime.c in OpenSSL 0.9.8t and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted S/MIME message.
https://bugzilla.redhat.com/show_bug.cgi?id=798100
https://bugzilla.novell.com/show_bug.cgi?id=748738
http://www.ubuntu.com/usn/USN-1424-1
http://www.securityfocus.com/bid/52181
http://www.redhat.com/support/errata/RHSA-2009-1335.html
http://www.openwall.com/lists/oss-security/2012/02/28/14
http://www.openwall.com/lists/oss-security/2012/02/27/10
http://www.mail-archive.com/openssl-dev%40openssl.org/msg30305.html
http://secunia.com/advisories/48899
http://secunia.com/advisories/48516
http://secunia.com/advisories/48153
http://secunia.com/advisories/36533
http://marc.info/?l=openssl-dev&m=115685408414194&w=2