Summary
Warning on "Exploit.CodeBaseExec" means that HTML page being scanned contains code exploiting the Microsoft Internet Explorer Arbitrary Program Execution Vulnerability, aka the Local Executable Invocation via Object tag vulnerability.
Many suspicious websites use this vulnerability to try do gain access to the local computer.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
Microsoft Internet Explorer 5.01, 5.5 and 6.0 treat objects invoked on an HTML page with the codebase property as part of the Local Computer zone, which allows remote attacks to invoke executables present on the local system through objects such as the popup object.
More information on this vulnerability can be found from: https://www.microsoft.com/technet/security/bulletin/ms02-015.asp?frame=true#CV...
Microsoft released a patch on March 28, 2002 that eliminates this vulnerability in Internet Explorer. To download this patch go to the following link: https://www.microsoft.com/windows/ie/downloads/critical/Q319182/default.asp
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