There is currently a security advisory out about a Zero Day vulnerability in Internet Explore 6 & 7 on Windows XP and Vista. While there is no patch out for this issues so far you can mitigate the security a number ways using Group Policy. Below I have listed two ways to implement the workaround as listed by Microsoft using Group Policy.
Method 1. Modify the Access Control List (ACL) on iepeers.dll
Step 1. Edit a Group Policy Object (GPO) that is targeted to the computer accounts you want to apply this setting. Then navigate to Computer Configurations > Windows Settings > Security Settings > File System.
Step 2. Click on â€œActionâ€ in the menu and then â€œAdd Fileâ€¦â€
Step 3. Type â€œ%WINDIR%\System32\iepeers.DLLâ€ into the Folder: field then click â€œOKâ€
Step 4. Click â€œAddâ€and then add the â€œEveryoneâ€ group and click â€œOKâ€
Step 5. Tick the Full Control â€œDenyâ€ tick box. This will then tick all the Deny tick boxes.
Step 6. Click â€œYesâ€ to the Deny warning.
Step 7. Click â€œOKâ€ to the permissions option.
Note: If you want to apply this to x64 version of Windows as well repeat step 2 thought 7 but type â€œ%WINDIR%\SYSWOW64\iepeers.DLLâ€ instead in the Folder: field.
You have now denied permissions to the file that has the issues.
Once you have applied the patch to fix this vulnerability be sure to go into each of file security settings and remove the â€œEveryoneâ€ deny permission from the setting.
Method 2: Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
Step 1. Edit a GPO that is targeted to the users accounts you want to apply security setting. Then Enabled both the â€œAllow active scriptingâ€ under User Configuration > Policies > Administrative Templates > Windows Components > Internet Explorer > Security Page > Internet Zone and the Intranet Zone. Then configure the Options to either â€œPromptâ€ or â€œDisableâ€.
Once you have performed the above configuration changes be sure to add *.windowsupdate.microsoft.com, *.update.microsoft.com and any other site you require to run Active Scripting on to the trusted sites zone list. Instructions on how to do this can be found here How to use Group Policy to configure Internet Explorer security zone sites
Disclaimer: I do not guarantee that this information will work. All the above information is to be used at your own risk.
For more details on the security vulnerability and other ways to mitigate this issue see Microsoft Security Advisory (981374)