A vulnerability has been identified in Microsoft Internet Explorer, which could be exploited by attackers to gain unauthorized access to arbitrary files. This flaw is due to a design error where keystroke events are cancellable via JavaScript, which could be exploited by remote attackers to trick users into uploading arbitrary files from a vulnerable system to a malicious host by convincing them to visit a specially crafted Web page and perform certain actions (e.g. write a specific text in a text field) that will cause an arbitrary file to be inadvertently uploaded [...]
Solution
FrSIRT is not aware of any vendor-supplied patch.
Disable Active Scripting in the Internet and Local intranet security zones :
- In Internet Explorer, click Internet Options on the Tools menu
- Click the Security tab
- Click Internet, and then click Custom Level
- Under Settings, in the Scripting section, under Active Scripting, click Disable, and then click OK
- Click Local intranet, and then click Custom Level
- Under Settings, in the Scripting section, under Active Scripting, click Disable, and then click OK
- If you are prompted to confirm that you want to change these settings, click Yes
- Click OK to return to Internet Explorer
Note : Disabling Active Scripting may cause some Web sites to work incorrectly.
Credits
Vulnerability reported by Charles McAuley
ChangeLog
2006-06-06 : Initial release
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