The excel_read_HLINK function in plugins/excel/ms-excel-read.c in Gnome Office Gnumeric before 1.8.1 allows user-assisted remote attackers to execute arbitrary code via a crafted XLS file containing XLS HLINK opcodes, possibly because of an integer signedness error that leads to an integer overflow. NOTE: some of these details are obtained from third party information.
https://www.redhat.com/archives/fedora-package-announce/2008-February/msg00227.html
https://www.redhat.com/archives/fedora-package-announce/2008-February/msg00114.html
http://www.vupen.com/english/advisories/2008/0462
http://www.ubuntu.com/usn/usn-604-1
http://www.securityfocus.com/bid/27536
http://www.mandriva.com/security/advisories?name=MDVSA-2008:056
http://www.gnome.org/projects/gnumeric/announcements/1.8/gnumeric-1.8.1.shtml
http://www.debian.org/security/2008/dsa-1546
http://security.gentoo.org/glsa/glsa-200802-05.xml
http://secunia.com/advisories/31339
http://secunia.com/advisories/29896
http://secunia.com/advisories/29702
http://secunia.com/advisories/28948
http://secunia.com/advisories/28799
http://secunia.com/advisories/28725/
http://lists.opensuse.org/opensuse-security-announce/2008-08/msg00001.html