SAP RFC_START_GUI RFC Function Buffer Overflow

Advisory Content :

(The following pre-advisory is also available in PDF format for download
at:
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_RFC_START_GUI_RF
C_Function_Buffer_Overflow.pdf )

CYBSEC S.A.
www.cybsec.com

Pre-Advisory Name: SAP RFC_START_GUI RFC Function Buffer Overflow
==================

Vulnerability Class: Buffer Overflow
====================

Release Date: 2007-04-03
=============

Affected Applications:
======================
. SAP RFC Library 6.40
. SAP RFC Library 7.00

Affected Platforms:
===================

. AIX 32bit
. AIX 64bit
. HP-UX on IA64 64bit
. HP-UX on PA-RISC 64bit
. Linux on IA32 32bit
. Linux on IA64 64bit
. Linux on Power 64bit
. Linux on x86_64 64bit
. Linux on zSeries 64bit
. Mac OS
. OS/400
. OS/400 V5R2M0
. Reliant 32bit
. Solaris on SPARC 32bit
. Solaris on SPARC 64bit
. Solaris on x64_64 64bit
. TRU64 64bit
. Windows Server on IA32 32bit
. Windows Server on IA64 64bit
. Windows Server on x64 64bit
. z/OS 32bit

Local / Remote: Remote
===============

Severity: High
=========

Author: Mariano Nuez Di Croce
=======

Vendor Status: Confirmed. Updates Released.
==============

Reference to Vulnerability Disclosure Policy:
http://www.cybsec.com/vulnerability_policy.pdf
=============================================

Product Overview:
=================

"The RFC Library offers an interface to a SAP System. The RFC Library is
the most commonly used and installed component of existing SAP Software.
This
interface provides the opportunity to call any RFC Function in a SAP System
from an external application. Moreover, the RFC Library offers the
possibility to write a RFC Server Program, which is accessible from any SAP
System or external application. Most SAP Connectors use the RFC Library as
communication platform to SAP Systems."

RFC_START_GUI RFC Function is used to start SAPGUI on front-end systems.
This function is installed by default in every external RFC server.

Vulnerability Description:
==========================

A remote buffer overflow vulnerability has been detected in the
RFC_START_GUI RFC Function.

Technical Details:
==================

Technical details will be released three months after publication of this
pre-advisory. This was agreed upon with SAP to allow their customers to
upgrade affected software prior to technical knowledge been publicly
available.

Impact:
=======

This vulnerability may allow an attacker to remotely execute arbitrary
commands over external RFC servers.

Solutions:
==========

SAP has released patches to address this vulnerability. Affected customers
should apply the patches immediately.
More information can be found on SAP Note 1003908.

Vendor Response:
================

. 2006-11-21: Initial Vendor Contact.
. 2006-12-01: Vendor Confirmed Vulnerability.
. 2006-12-11: Vendor Releases Update for version 6.40.
. 2006-12-11: Vendor Releases Update for version 7.00.
. 2007-04-03: Pre-Advisory Public Disclosure.

Special Thanks:
===============

Thanks goes to Victor Montero and Gustavo Kunst.

Contact Information:
====================
For more information regarding the vulnerability feel free to contact the
author at mnunez <at> cybsec <dot> com.

About CYBSEC S.A. Security Systems
-----------------------------------

Since 1996 CYBSEC S.A. is devoted exclusively to provide professional
services specialized in Computer Security. More than 150 clients around
the
globe validate our quality and professionalism.
To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is
associated with other software and/or hardware provider companies.
Our services are strictly focused on Information Security, protecting our
clients from emerging security threats, mantaining their IT deployments
available, safe, and reliable.
Beyond professional services, CYBSEC is continuosly researching new defense
and attack techiniques and contributing with the security community with
high quality information exchange.

For more information, please visit www.cybsec.com

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SAP RFC_START_GUI RFC Function Buffer Overflow