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TITLE:
Gnumeric XLS HLINK Opcode Processing Code Execution Vulnerability

SECUNIA ADVISORY ID:
SA28725

VERIFY ADVISORY:
http://secunia.com/advisories/28725/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
GNOME Gnumeric 1.x
http://secunia.com/product/5626/

DESCRIPTION:
A vulnerability has been reported in Gnumeric, which can be exploited
by malicious people to compromise a user's system.

The vulnerability is caused due to integer overflows and signedness
errors when processing XLS HLINK opcodes within the
"excel_read_HLINK()" function in plugins/excel/ms-excel-read.c. This
can be exploited to corrupt the stack via a specially crafted XLS
file.

Successful exploitation allows execution of arbitrary code.

The vulnerability is confirmed in version 1.6.3. Versions prior to
1.8.1 may also be affected.

SOLUTION:
Update to version 1.8.1.
http://ftp.gnome.org/pub/GNOME/sources/gnumeric/1.8/

PROVIDED AND/OR DISCOVERED BY:
Originally reported by the vendor as a crash.

Additional information provided by Secunia Research.

ORIGINAL ADVISORY:
http://www.gnome.org/projects/gnumeric/announcements/1.8/gnumeric-1.8.1.shtml
http://bugzilla.gnome.org/show_bug.cgi?id=505330

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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