Secunia Research: Danske Bank e-Sec Control Module Error Logging Buffer Overflow

[Secunia Research <remove-vuln@xxxxxxxxxxx>]

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                     Secunia Research 16/04/2009

 - Danske Bank e-Sec Control Module Error Logging Buffer Overflow -

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Table of Contents

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

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1) Affected Software 

* Danske Bank Danske e-Sec Control Module ActiveX control 
  (DanskeSikker.ocx) version 3.1.0.48.

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) Description of Vulnerability

Secunia Research has discovered a vulnerability in Danske Bank Danske
e-Sec Control Module ActiveX control, which can be exploited by
malicious people to compromise a user's system.

The vulnerability is caused by a boundary error in DanskeSikker.ocx
within an error logging function. This can be exploited to cause a
stack-based buffer overflow by passing overly long input to certain
methods when the ActiveX control has been initialised in a specific 
manner.

Successful exploitation allows execution of arbitrary code when e.g.
visiting a malicious web site.

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4) Solution 

Set the kill-bit for the ActiveX control.

The vendor is reportedly working on a fix.

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5) Time Table 

16/04/2008 - Vendor notified.
16/04/2008 - Vendor response.
25/06/2008 - Status update requested.
27/06/2008 - Vendor response (responsible person is on holiday, but
             will provide status update ASAP).
24/07/2008 - Status update requested.
13/08/2008 - Status update requested.
13/08/2008 - Vendor response.
25/08/2008 - Status update requested.
18/09/2008 - Vendor informed that advisory is going out today.
18/09/2008 - Vendor calls asking for extension.
05/11/2008 - Status update requested.
05/11/2008 - Vendor response (currently no progress).
10/11/2008 - Vendor informed about Secunia Reserach disclosure policy
             and informed that a new status update will be requested 
             in a couple of months.
02/03/2009 - Status update requested.
11/03/2009 - Status update requested again.
17/03/2009 - Vendor provides status update (working on a fix).
20/03/2009 - Vendor reminded of Secunia Research disclosure policy.
             Advisory will not be coordinated for more than 1 year.
16/04/2009 - Public disclosure.

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6) Credits 

Discovered by Carsten Eiram, Secunia Research.

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7) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2008-1107 for the vulnerability.

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8) About Secunia

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9) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-17/

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

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