(The following pre-advisory is also available in PDF format for download at:
Pre-Advisory Name: SAP TRUSTED_SYSTEM_SECURITY RFC Function Information Disclosure
Vulnerability Class: Information Disclosure
Release Date: 2007-04-03
. SAP RFC Library 6.40
. SAP RFC Library 7.00
. 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 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
Author: Mariano Nuñez Di Croce
Vendor Status: Confirmed. Updates Released.
Reference to Vulnerability Disclosure Policy: http://www.cybsec.com/vulnerability_policy.pdf
"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."
TRUSTED_SYSTEM_SECURITY RFC function was developed for internal use by SAP only. This function is installed by default in every external RFC server.
The original purpose of this function was to obtain a fingerprint of a Windows domain. By the way it is developed, it is possible to take advantage of
its functionality to obtain further information.
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.
This vulnerability may allow an attacker to remotely verify the existence of user accounts/groups in external server's system/domain/trusted domains.
SAP has released patches to address this vulnerability. Affected customers should apply the patches immediately.
More information can be found on SAP Note 1003910.
. 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.
Thanks goes to Victor Montero and Gustavo Kunst.
For more information regarding the vulnerability feel free to contact the author at mnunez <at> cybsec <dot> com.
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