VUPEN Security Research - Novell GroupWise Calendar "RRULE" Remote Buffer Overflow Vulnerability Website : http://www.vupen.com/english/research.php Twitter : http://twitter.com/vupen I. BACKGROUND --------------------- "Novell GroupWise is a messaging and collaborative software platform that supports email, calendaring, personal information management, instant messaging, and document management." (Wikipedia) II. DESCRIPTION --------------------- VUPEN Vulnerability Research Team discovered a critical vulnerability in Novell GroupWise. The vulnerability is caused by a buffer overflow error in the "NgwIRecurByWeekdayParam::bywdaylist()" function within the "gwwww1.dll" component when processing a malformed "RRULE" property in a Calendar, which could be exploited by remote unauthenticated attackers to compromise a vulnerable server via a specially crafted email message. CVSS Score: 10 (AV:N/AC:L/Au:N/C:C/I:C/A:C) III. AFFECTED PRODUCTS --------------------------- Novell GroupWise v8.0.2 (SP2) Hot Patch 2 (HP2) and prior IV. Binary Analysis & Exploits/PoCs --------------------------------------- In-depth binary analysis of the vulnerability and a proof-of-concept code are available through the VUPEN Binary Analysis & Exploits portal : http://www.vupen.com/english/services/ba-index.php VUPEN Binary Analysis & Exploits Service provides private exploits and in-depth technical analysis of the most significant public vulnerabilities based on disassembly, reverse engineering, protocol analysis, and code audit. The service allows governments and major corporations to evaluate risks, and protect infrastructures and assets against new threats. The service also allows security vendors (IPS, IDS, AntiVirus) to supplement their internal research efforts and quickly develop both vulnerability-based and exploit-based signatures to proactively protect their customers from attacks and emerging threats. V. VUPEN Threat Protection Program ----------------------------------- Governments and major corporations which are members of the VUPEN Threat Protection Program (TPP) have been proactively alerted about the vulnerability when it was discovered by VUPEN in advance of its public disclosure, and have received a detailed attack detection guidance to protect national and critical infrastructures against potential 0-day attacks exploiting this vulnerability: http://www.vupen.com/english/services/tpp-index.php VI. SOLUTION ---------------- Upgrade to Novell GroupWise v8.0.2 (SP2) Hot Patch 3 (HP3) VII. CREDIT -------------- This vulnerability was discovered by Sebastien Renaud of VUPEN Security VIII. ABOUT VUPEN Security --------------------------- VUPEN is the world leader in vulnerability research for defensive and offensive cyber security. VUPEN solutions enable corporations and governments to measure and manage risks, eliminate vulnerabilities before they can be exploited, and protect critical infrastructures and assets against known and unknown vulnerabilities. VUPEN has been recently recognized as "Company of the Year in the Vulnerability Research Market (2011)" by Frost & Sullivan. VUPEN solutions include: * VUPEN Binary Analysis & Exploits Service (BAE) : http://www.vupen.com/english/services/ba-index.php * VUPEN Threat Protection Program (TPP) : http://www.vupen.com/english/services/tpp-index.php IX. REFERENCES ---------------------- http://download.novell.com/Download?buildid=gBjwGIdt77s~ http://www.vupen.com/english/research.php X. DISCLOSURE TIMELINE ----------------------------- 2010-11-16 - Vulnerability Discovered by VUPEN and shared with TPP customers 2011-09-27 - Public disclosure