Secunia Research: SAP GUI KWEdit ActiveX Control "SaveDocumentAs()" Insecure Method

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                     Secunia Research 15/04/2009

- SAP GUI KWEdit ActiveX Control "SaveDocumentAs()" Insecure Method -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* SAP GUI 6.40 Patch 29 (KWEDIT.DLL version 6400.1.1.41)
* SAP GUI 7.10 Patch 5 (KWEDIT.DLL version 7100.1.1.43)

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System compromise
Where:  Remote

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3) Vendor's Description of Software 

"SAP GUI is SAP's universal client for accessing SAP functionality in
SAP applications such as - SAP ERP, SAP Business Suite (SAP CRM, SAP
SCM and SAP PLM), SAP Business Intelligence and so on. SAP GUI
functions like a browser. It gets information from the SAP server like
what, where, when and how, to display contents in its window.".

Product Link:
https://www.sdn.sap.com/irj/sdn/sap-gui

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4) Description of Vulnerability

Secunia Research has discovered a security issue in SAP GUI, which can
be exploited by malicious people to gain knowledge of sensitive 
information, corrupt files, or compromise a user's system.

The problem is that the bundled KWEdit ActiveX control (KWEDIT.DLL) 
provides the insecure method "SaveDocumentAs()", which saves an HTML 
document to a specified location. This can be exploited in combination
with e.g. the "OpenDocument()" method to disclose the contents of 
files or to execute arbitrary code on a user's system.

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5) Solution 

Update to the latest versions, which reportedly set the kill-bit for 
the ActiveX control.

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6) Time Table 

28/11/2008 - Vendor notified.
28/11/2008 - Vendor response.
14/01/2009 - Vendor provides patch for testing.
16/01/2009 - Vendor informed that patch prevents exploitation.
02/03/2009 - Status update requested.
02/03/2009 - Vendor provides status update.
15/04/2009 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

SAP Note 1294913:
https://service.sap.com/sap/support/notes/1294913

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2008-4830 for the vulnerability.

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9) About Secunia

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-56/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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