Thilo Pfennig and Morten Welinder discovered several integer overflow
weaknesses in Gnumeric, a GNOME spreadsheet application. These
vulnerabilities could result in the execution of arbitrary code
through the opening of a maliciously crafted Excel spreadsheet.
Read the full story: DSA-1546 gnumeric – integer overflow: http://www.debian.org/security/2008/dsa-1546