TippingPoint Zero Day Initiative

Microsoft Office Excel RealTimeData Record Parsing Remote Code Execution Vulnerability

ZDI-11-120: April 12th, 2011


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10872. For further product information on the TippingPoint IPS:

Vulnerability Details

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

The flaw exists within the methods used for RealTimeData Record Parsing. When handling a stTopic field has a bit set specifying double byte characters in the following field the value of a global pointer is improperly calculated. This pointer is later used in a memcpy operation whose source is user supplied data. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the user.

Vendor Response

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

Disclosure Timeline

    2010-11-15 - Vulnerability reported to vendor
    2011-04-12 - Coordinated public release of advisory


This vulnerability was discovered by:
    Aniway (Aniway.Anyway AT gmail DOT com)