TippingPoint Zero Day Initiative

Novell GroupWise Internet Agent COMMENT Parsing Remote Code Execution Vulnerability

ZDI-10-240: November 8th, 2010

CVSS Score

Affected Vendors

Affected Products


TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10655. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell GroupWise. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the gwwww1.dll module responsible for parsing VCALENDAR data within e-mail messages. When the code encounters a COMMENT variable it allocates up to 0xFFFF bytes for the variable's value. It then proceeds to copy the value into the fixed-length buffer without checking if it will fit. By specifying a large enough string in the e-mail, an attacker can overflow the buffer and execute arbitrary code under the context of the SYSTEM user.

Vendor Response

Novell states:

Linux - http://download.novell.com/Download?buildid=04oMMaiI9nI~
NetWare/Windows - http://download.novell.com/Download?buildid=aq06Eoy7rf4~

The GroupWise Internet Agent (GWIA) has multiple vulnerabilities in the way that it parses variables within a received VCALENDAR message, which could potentially allow an unauthenticated remote attacker to execute arbitrary code on vulnerable installations of GWIA.
Affected versions: GroupWise 8.0x, 8.01x, 8.02. Previous versions of GroupWise are likely also vulnerable but are no longer supported. Customers on earlier versions of GroupWise should, at a minimum, upgrade their GWIAs and associated Domains to version 8.02HP in order to secure their system.
These vulnerabilities were discovered and reported by Anonymous working with TippingPoint's Zero Day Initiative (http://www.zerodayinitiative.com), ZDI-CAN-954,ZDI-CAN-960, ZDI-CAN-961
Novell bugs 642339, 642345, 642349, CVE numbers pending
Related TID: http://www.novell.com/support/search.do?usemicrosite=true&searchString=7007155

Disclosure Timeline

    2010-09-24 - Vulnerability reported to vendor
    2010-11-08 - Coordinated public release of advisory


This vulnerability was discovered by: