From: Secunia Research <vuln@secunia.com> 
To: full-disclosure@lists.grok.org.uk 
Date: Tue, 20 Sep 2005 11:06:05 +0200 
Cc: bugtraq@securityfocus.com 
Subject: [Full-disclosure] Secunia Research: Opera Mail Client Attachment 
        Spoofing and Script Insertion 
Reply-To: vuln@secunia.com 
Errors-To: full-disclosure-bounces@lists.grok.org.uk 
 
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                     Secunia Research 20/09/2005 
 
   - Opera Mail Client Attachment Spoofing and Script Insertion - 
 
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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 
 
Opera 8.02 
 
Prior versions may also be affected. 
 
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2) Severity 
 
Rating: Moderately Critical 
Impact: Script Insertion, Spoofing 
Where:  From Remote 
 
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3) Description of Vulnerability 
 
Secunia Research has discovered two vulnerabilities in the Opera Mail 
client, which can be exploited by a malicious person to conduct script 
insertion attacks and to spoof the name of attached files. 
 
1. Attached files are opened without any warnings directly from the 
user's cache directory. This can be exploited to execute arbitrary 
JavaScript in context of "file://". 
 
2. Normally, filename extensions are determined by the "Content-Type"  
in Opera Mail. However, by appending an additional '.' to the end of 
a filename, an HTML file could be spoofed to be e.g. "image.jpg.". 
 
The two vulnerabilities combined may be exploited to conduct script 
insertion attacks if the user chooses to view an attachment named 
e.g. "image.jpg." e.g. resulting in disclosure of local files. 
 
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4) Solution 
 
Update to version 8.50. 
http://www.opera.com/download/ 
 
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5) Time Table 
 
01/09/2005 - Initial vendor notification. 
20/09/2005 - Public disclosure. 
 
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6) Credits 
 
Discovered by Jakob Balle, Secunia Research. 
 
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7) References 
 
No references available. 
 
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