ZDI-11-025: Novell GroupWise Internet Agent REQUEST-STATUS Parsing Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-025

January 25, 2011

-- CVE ID:
CVE-2010-4326

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Novell

-- Affected Products:
Novell Groupwise

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10788.
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

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

http://www.novell.com/support/search.do?cmd=displayKC&docType=kc&externalId=7007155&sliceId=1&docTypeID=DT_TID_1_1&dialogID=199990003&stateId=0%200%20199988016

-- Disclosure Timeline:
2010-09-24 - Vulnerability reported to vendor
2011-01-25 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

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