A look at Internet Explorer from the inside out. Note: @EricLaw left Microsoft in 2012, but was named an IE MVP in 2013.
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Braindump: Feature Control Keys and URLActions
Note: The “brain dump” series is akin to what the support.microsoft.com team calls “Fast Publish” articles—namely, things that are published quickly, without the usual level of polish, triple-checking, etc. I expect that these posts will contain errors, but I also expect...
27 Sep 2012
Understanding Zone Elevation
The security setting “Websites in less privileged web content zone can navigate into this zone”: ... is one that leads to more questions than almost any other. This setting, also known as Zone Elevation protection , was originally designed to prevent navigation from untrusted Internet...
24 Sep 2012
Debugging in IE10 on Windows 8
Emulating the “non-Desktop Experience” in the Desktop Experience The new full-screen “fast and fluid” experience of IE10 on Windows 8 offers many improvements over Internet Explorer 10 on the Desktop (ranging from UX to Security), but one thing it lacks is the F12 Developer...
5 Sep 2012
The Intranet Zone
Internet Explorer maps web content into one of five security zones. After the Local Machine Zone, the Local Intranet Zone is probably the most misunderstood of the Zones, and is a common source of confusion and compatibility glitches. Mapping into the Local Intranet Zone For the Trusted and Restricted...
5 Jun 2012
Understanding Enhanced Protected Mode
Last week, Andy Zeigler announced the introduction of Enhanced Protected Mode (EPM) over on the IEBlog. In today’s post, I’d like to provide further technical details about EPM to help security researchers, IT professionals, enthusiasts, and developers better understand how this feature works...
23 Mar 2012
Internet Explorer 9.0.2 Update
Tuesday’s Update for Internet Explorer updates the IE9 Help > About dialog’s version number to v9.0.2. The update includes a number of security and functionality fixes; many of these fixes are described in the More Information section of KB2559049 . One fix enables the IE9 Download Manager...
12 Aug 2011
Default Integrity Level and Automation
Over on StackOverflow , danimajo asked for help in an interesting scenario. Basically, he’s trying to drive Internet Explorer through automation, but finds that when he navigates to an Intranet site, the hidden browser instance appears and he can no longer control it. What’s going on? ...
3 Aug 2011
Controlling Java in Internet Explorer
Recently, there’s been some interest in how to control the use of Java within Internet Explorer. Java is a unique form of extensibility because it can be invoked in two ways: Using an APPLET element Using an OBJECT element with a CLSID of a JVM These two invocation methods are subject...
15 May 2011
Understanding Local Machine Zone Lockdown
Recently, a colleague sent me an email which provided a flashback into my own past: Hey, Eric-- Why do we show this when opening HTML locally? What are we protecting the user from? -Ben I myself had sent an email with almost the same text nearly seven years ago, and the surprisingly...
23 Mar 2011
A Primer on Temporary Internet Files
On Windows Vista and above, Internet Explorer’s Temporary Internet Files are maintained in two isolated WinINET cache containers. One cache is used for sites loaded in Protected Mode (Internet Zone and Restricted Zone) and the other cache is used for sites loaded outside of Protected Mode (Trusted...
19 Mar 2011
Beware Cookie Sharing in Cross-Zone Scenarios
Note: I mentioned this problem before ( Troubleshooting Login Cookies #3 ) but it was buried in a long post and this is an issue that lots of folks inside Microsoft hit, so I’m pulling it out into its own post. The Problem From time to time, various users have complained to the IE team that...
10 Mar 2011
IE9 - XBAPs Disabled in the Internet Zone
As I mentioned last month , .NET Framework XAML Browser Applications ( XBAPs ) are now prevented from loading from the Internet Zone in IE9. When visiting an Internet site that utilizes an XBAP , an error message is shown, indicating that the application type has been disabled: XBAPs are...
9 Mar 2011
File Download and Filenames
Several months ago, I blogged about IE’s support for International Filenames on Downloads . Today’s post is a bit simpler and describes two cases when IE may rename downloaded files. Filename Extension and QueryString Parameters If a file download HTTP response does not contain a Content...
22 Nov 2010
Understanding Cookie Controls
Internet Explorer offers an extremely rich set of options for controlling cookies . The default settings are fairly well-balanced, but some users may want to introduce more restrictive or specialized controls. To configure cookie settings in IE, click Tools > Internet Options . Click the Privacy...
5 Jun 2010
New Tool: Compare IE Security Settings
“IE Zone Comparer” was designed to provide additional visibility into URLMon's security zone settings. Pick any two collections of security zone settings, and IE Zone Comparer displays the values of those settings, highlighting any differences between the two collections. Note: Updated on 11/7/2009...
1 Oct 2009
Why Won’t IE Remember My Login Info?
Over on the Microsoft Answers forum , some folks have reported that Internet Explorer doesn’t remember their login details. This is a tricky problem to troubleshoot because there are a number of different problems which get lumped together under this description, and there are a number of different...
10 Sep 2009
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