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Opera Cross Domain Scripting Vulnerability

Risk

High

Date Discovered

February 4, 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.

Technologies Affected

  • Opera Software Opera Web Browser 7.0.0 win32

Recommendations

Run all software as a nonprivileged 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.

Credits

Discovery of these vulnerabilities credited to GreyMagic Software.
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Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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