SEC Consult Vulnerability Lab Security Advisory < 20160825-0 > ======================================================================= title: Multiple vulnerabilities product: Micro Focus GroupWise vulnerable version: GroupWise 2014 R2 (<=SP1) GroupWise 2014 (unsupported versions may be affected) fixed version: GroupWise 2014 R2 Service Pack 1 Hot Patch 1 CVE number: CVE-2016-5760, CVE-2016-5761, CVE-2016-5762 impact: critical homepage: https://www.novell.com/products/groupwise/ found: 2016-07 by: W. Ettlinger (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Montreal - Moscow Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Micro Focus GroupWise is a complete collaboration software solution that provides email, calendaring, instant messaging, task management, contact and document management functions. GroupWise has long been praised by customers and industry watchers for its security and reliability." URL: https://www.novell.com/products/groupwise/ Business recommendation: ------------------------ During a quick security check SEC Consult found three vulnerabilities in the Micro Focus GroupWise server applications. As these partly critical vulnerabilities were identified during a short time frame SEC Consult recommends to conduct a thorough technical security audit. Vulnerability overview/description: ----------------------------------- 1) Reflected cross site scripting in the administrator console (CVE-2016-5760) Two reflected cross site scripting vulnerabilities have been identified in the gwadmin-console application. An attacker could potentially take over an administrator's session. 2) Persistent cross site scripting via emails (CVE-2016-5761) By sending a single email to a victim an attacker could take over the victim's email account. For a successful exploitation the victim has to click on a link in an email opened in GroupWise WebAccess. 3) Heap-based Buffer Overflow / Integer Overflow (CVE-2016-5762) By sending a crafted value for the username or the password to GroupWise WebAccess or the GroupWise Post Office Agent during login an attacker can overwrite heap memory. In order to exploit this vulnerability no user authentication is required. PLEASE NOTE: A successful exploitation of this vulnerability may allow an attacker to execute code remotely. As SEC Consult only conducted a very quick security check this has not been verified. Proof of concept: ----------------- 1) Reflected cross site scripting in the administrator console The following links demonstrate reflected cross site scripting vulnerabilities: https://testhost:9710/gwadmin-console/install/login.jsp?token=asdf%22%2b alert%28%27xss%27%29%2b%22 https://testhost:9710/gwadmin-console/index.jsp#poa:%3Cimg%20src=x%20one rror=alert%28%27xss%27%29%3E 2) Persistent cross site scripting via emails The following Python fragment demonstrates the generation of a hyperlink that, when embeded into an HTML email, would, upon clicking it, open a new mail dialog. ---- snip ---- msg = """ <a href="javascript:top.opener.document.getElementById(String.fromCharCode( $charcode)).firstChild.firstChild.click()" target = _self>click me</a> """.replace('$charcode', ','.join(str(ord(x)) for x in list('idNewPopupMenu'))) ---- snip ---- 3) Heap-based Buffer Overflow / Integer Overflow When a username or password longer than 65332 (2^16 - 3) is specified, an overflow causes the Post Office Agent to allocate too little memory. The following pseudocode shows how the memory to be allocated is calculated based on the input length. ((uint16_t) ((<length>) + 3) & 0xFFFC) + 1) Therefore, a value of 65533 would cause the application to allocate 1 byte. By modifying this value accordingly, an attacker can cause the application to allocate an arbitrary amount of memory. The user-specified value is then copied into this buffer until a NUL-byte is reached. This allows an attacker to write non-NUL bytes after the allocated heap chunk. Vulnerable / tested versions: ----------------------------- The version 2014 R2 SP1 of Micro Focus GroupWise was found to be vulnerable. This version was the latest version at the time of the discovery. Vendor contact timeline: ------------------------ 2016-07-05: Contacting vendor through security (at) novell (dot) com [email concealed] 2016-07-06: Micro Focus was able to reproduce the vulnerabilities 2016-07-25: Micro Focus: The issues have been resolved in development 2016-08-12: Micro Focus: Hotpatch is currently undergoing QA 2016-08-25: Coordinated release of security advisory Solution: --------- The "GroupWise 2014 R2 Service Pack 1 Hot Patch 1" should be applied immediately. This update can be found at: http://download.novell.com/Download?buildid=RrXPw5FEDLg~ (Linux) http://download.novell.com/Download?buildid=aSiFyZ1z1SY~ (Windows) Knowledge base references at Micro Focus: https://www.novell.com/support/kb/doc.php?id=7017973 (#1) https://www.novell.com/support/kb/doc.php?id=7017974 (#2) https://www.novell.com/support/kb/doc.php?id=7017975 (#3) Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Montreal - Moscow Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF W. Ettlinger / @2016