TippingPoint Zero Day Initiative

IBM Forms Viewer 'fontname' Stack Buffer Overflow Remote Code Execution Vulnerability

ZDI-13-274: December 15th, 2013


CVSS Score

Affected Vendors

Affected Products

    Forms Viewer

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of IBM Forms Viewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within a document handler of an XFDL document. The parsing of the 'fontname' tag with a large value can lead to a stack buffer overflow. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the process.

Vendor Response

IBM has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2013-09-27 - Vulnerability reported to vendor
    2013-12-15 - Coordinated public release of advisory


This vulnerability was discovered by:
    Andrea Micalizzi aka rgod