Advisory Details

January 26th, 2011

Novell GroupWise Internet Agent TZID Parsing Remote Code Execution Vulnerability

ZDI-11-027
ZDI-CAN-967

CVE ID CVE-2010-4325
CVSS SCORE 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Novell
AFFECTED PRODUCTS Groupwise
TIPPINGPOINT™ IPS CUSTOMER PROTECTION TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10797. For further product information on the TippingPoint IPS: 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 TZID 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=7007638&sliceId=1&docTypeID=DT_TID_1_1&dialogID=199990255&stateId=0%200%20199988170
DISCLOSURE TIMELINE
  • 2010-11-30 - Vulnerability reported to vendor
  • 2011-01-26 - Coordinated public release of advisory
CREDIT Anonymous
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