Bug 106688 – www-client/opera<=8.02: Attachment Spoofing and Script Insertion

• Product: Gentoo Security
• Status: RESOLVED INVALID

[Description Carsten Lohrke (RETIRED) 2005-09-20 08:36:58 UTC]

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.

The vulnerabilities have been confirmed in Opera version 8.02, prior versions
may also be vulnerable.

http://secunia.com/advisories/16645/


Update to version 8.50 available.

[Comment 1 Tavis Ormandy (RETIRED) 2005-09-20 09:07:13 UTC]

Suggest marking INVALID.

1. So, don't open untrusted attachments.
2. File extensions are meaningless.

[Comment 2 Sune Kloppenborg Jeppesen (RETIRED) 2005-09-20 23:32:42 UTC]

Unless the attached files are opened without user interaction I agree with 
Tavis. 

[Comment 3 Thierry Carrez (RETIRED) 2005-09-21 05:38:02 UTC]

I tend to agree with both of you. Only Windows users suppose extensions
determine what the file contains. Please reopen with detailed explanation if you
disagree.