Opera Cross Domain Scripting Vulnerability
Risk
High
Date Discovered
02-04-2003
Description
A vulnerability has been reported reported for Opera 7 browsers for Microsoft Windows operating systems.
Due to flaws in Opera, it is possible for functions in different domains to be accessed and executed by an attacker with the credentials of the victim user. This vulnerability is also exacerbated by the fact that an attacker may also be able to override properties and methods in other windows to create malicious methods that will be accessed by a victim user.
Exploitation of this vulnerability will allow an attacker to obtain access to local resources on a vulnerable system.
Components Affected
Opera Software Opera Web Browser 7.0 win32
Recommendations
Run all client software as a non-privileged user with minimal access rights.
Perform trivial tasks, such as browsing the Web, as a user with minimal privileges. This may reduce the consequences of successful exploitation.
Do not follow links provided by unknown or untrusted sources.
Some links may be obfuscated to redirect a user to a malicious site; be extremely cautious before following links provided by unknown sources.
Set web browser security to disable the execution of script code or active content.
Configure Opera to disable JavaScript as this will prevent exploitation of this vulnerability.
Opera Software has reportedly addressed this issue in Opera 7.01 for Windows.
Opera Software Opera Web Browser 7.0 win32:
Opera Software Upgrade Opera Web Browser 7.01 Win32
http://www.opera.com/download/index.dml?opsys=Windows&lng=en&platform=Windows
References
Source: GreyMagic Security Advisory GM#002-OP
URL: http://security.greymagic.com/adv/gm002-op/
Source: Opera Browser
URL: http://www.opera.com
Credits
Discovery of these vulnerabilities credited to GreyMagic Software.
Copyright (c) 2003 by Symantec Corp.
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Disclaimer
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