Integer signedness error in (1) QuickLook in Apple Mac OS X 10.5.5 and (2) Office Viewer in Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 allows remote attackers to cause a denial of service (application termination) and execute arbitrary code via a crafted Microsoft Excel file that triggers an out-of-bounds memory access, related to "handling of columns."
https://exchange.xforce.ibmcloud.com/vulnerabilities/45784
http://www.vupen.com/english/advisories/2008/3232
http://www.vupen.com/english/advisories/2008/2780
http://www.securitytracker.com/id?1021027
http://www.securityfocus.com/bid/31707
http://www.securityfocus.com/bid/31681
http://support.apple.com/kb/HT3318
http://support.apple.com/kb/HT3216
http://secunia.com/advisories/32756
http://secunia.com/advisories/32222
http://lists.apple.com/archives/security-announce/2008/Oct/msg00001.html
http://lists.apple.com/archives/security-announce/2008/Nov/msg00002.html