(The following pre-advisory is also available in PDF format for download at:
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_RFC_SET_REG_SERVER_PROPERTY_RFC_Function_Denial_of_Service.pdf
)
CYBSEC S.A.
www.cybsec.com
Pre-Advisory Name: SAP RFC_SET_REG_SERVER_PROPERTY RFC Function Denial Of
Service
==================
Vulnerability Class: Denial Of Service
====================
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: Medium
=========
Author: Mariano Nuñez 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_SET_REG_SERVER_PROPERTY RFC function is used to set properties of
externally registered RFC servers. This function is installed by default in
every external RFC server.
Vulnerability Description:
==========================
This function allows defining the exclusive use of an external registered RFC
server, denying access to other clients.
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 prevent licit clients to
connect with 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 1005397.
Vendor Response:
================
. 2006-11-21: Initial Vendor Contact.
. 2006-12-01: Vendor Confirmed Vulnerability.
. 2007-01-09: Vendor Releases Update for version 6.40.
. 2007-01-09: 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
-----------------------------------
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