Message-ID: <EE499D69B3D0714590B6FE9762B0461104BF3274E9@emb01.unity.local>
Date: Mon, 8 Nov 2010 16:46:55 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'Full Disclosure (full-disclosure@...ts.grok.org.uk)'"
	<full-disclosure@...ts.grok.org.uk>,
	"'Bugtraq (bugtraq@...urityfocus.com)'" <bugtraq@...urityfocus.com>
Subject: ZDI-10-240: Novell GroupWise Internet Agent
 COMMENT Parsing Remote Code Execution Vulnerability

ZDI-10-240: Novell GroupWise Internet Agent COMMENT Parsing Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-240

November 8, 2010

-- 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 10655.
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 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

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

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

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