A vulnerability and some security issues have been reported in Opera, which can be exploited by malicious people to bypass certain security restrictions or compromise a user's system.

1) The problem is that the "Download" dialog provides the option to run a downloadable executable at a predictable location in the browser window. This can be exploited to trick a user into clicking on the "Run" button by positioning a new window on top of the "Download" dialog that is closed e.g. via a timeout shortly before the user clicks on a link within this window.

This security issue is confirmed in version 10.53, 10.54, and 10.60 on Windows XP. Other versions may also be affected.

NOTE: This is related to SA15781.

2) An error exists in the processing of painting operations on a canvas while certain transformations are being applied, which can be exploited to cause a heap-based buffer overflow.

Successful exploitation may allow execution of arbitrary code.

3) An input sanitisation error in the handling of news feed previews can be exploited to execute script code and automatically subscribe the user to the feed.

Solution
Update to version 10.61.

Provided and/or discovered by
1) Jakob Balle and Sven Krewitt, Secunia Research
2) The vendor credits Kuzzcc
3) The vendor credits Alexios Fakos

Changelog
Further details available to Secunia VIM customers

Original Advisory
Secunia Research:
http://secunia.com/secunia_research/2010-110/

Opera:
http://www.opera.com/docs/changelogs/windows/1061/
http://www.opera.com/support/kb/view/966/
http://www.opera.com/support/kb/view/967/
http://www.opera.com/support/kb/view/968/

Other references
Further details available to Secunia VIM customers

Technical Analysis
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Deep Links
Links available to Secunia VIM customers