Multiple vulnerabilities in Micro Focus GroupWise

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


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




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."





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%2balert%28%27xss%27%29%2b%22

https:// testhost:9710/gwadmin-console/index.jsp#poa:%3Cimg%20src=x%20onerror=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($charcode))" target = _self>click me</a>
""".replace('$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

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





The "GroupWise 2014 R2 Service Pack 1 Hot Patch 1" should be applied

immediately. This update can be found at: (Linux) (Windows)


Knowledge base references at Micro Focus: (#1) (#2) (#3)








Advisory URL:






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


Interested in improving your cyber security with the experts of SEC Consult?

Contact our local offices



Mail: research at sec-consult dot com





EOF W. Ettlinger / @2016