SAP R/3 Remote Function Call API Lets Remote Users Conduct Password Guessing Attempts
SecurityTracker Alert ID: 1006223|
SecurityTracker URL: http://securitytracker.com/id/1006223
(Links to External Site)
Updated: Mar 16 2004|
Original Entry Date: Mar 5 2003
Host/resource access via network|
Exploit Included: Yes |
Version(s): SAP R/3 4.6C/D|
A vulnerability was reported in SAP R/3. A remote user can conduct unlimited login attempts using the SAP Remote Function Call (RFC) API without being subject to account lockouts.|
It is reported that the SAP R/3 GUI will lock out the remote user after a certain number of invalid login attempts. However, the RFC API reportedly does not implement lockouts.
A remote user can conduct continuous password guessing attempts.
A remote user can conduct password guessing attempts without being locked out.|
No solution was available at the time of this entry.|
Vendor URL: www.sap.com/ (Links to External Site)
|Underlying OS: Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), UNIX (Tru64), Windows (NT), Windows (2000)|
|Underlying OS Comments: Confirmed on Windows 2000|
Source Message Contents
Subject: [Full-Disclosure] SAP R/3, account locking and RFC SDK|
Content-Type: text/plain; charset=ISO-8859-1
I wrote a networked password checker for SAP R/3, mainly based on the
sapinfo program provided by SAP and using the RFC (Remote Function Call)
In a default install of SAP R/3, three bad login/password attempts in
the SAPGUI will kill the GUI. After 4 SAPGUI deaths (4*3 =3D 12 attempts),
the tested account is locked (UFLAG=3D128 in SAPR3.USR02).
My problem is that, with the RFC API, I can check as much login/password
combo as I want, without locking the target account. Once the password
is found, I just have to use SAPGUI to log in the SAP system.
So, IMO and as far as I tested it, account locking isn't working via the
API provided by the SDK RFC. Could somebody confirm this behaviour ?
This was tested on Linux for the client side and on Win2K for the server
side. The release of SAP R/3 is 46C/D.
Nicolas Gregoire ----- Consultant en S=E9curit=E9 des Syst=E8mes d'Informat=
firstname.lastname@example.org ------[ ExaProbe ]------ http://www.exaprobe.com/
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