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October 2009 - Posts

Tuesday, October 13, 2009 10:53 PM

Using Meddler to Simulate Web Traffic

As mentioned back in July , IE8’s new lookahead downloader has a number of bugs which cause it to issue incorrect speculative download requests. The “BASE Bug” caused the speculative downloader to only respect the <BASE> element for the first speculatively
Posted by EricLaw | 3 Comments
Monday, October 12, 2009 12:01 PM

Capturing Crash Dumps for Analysis

Sometimes, folks report crashes to the IE team that we are unable to reproduce internally. That’s usually because, as mentioned often, most crashes are caused by buggy browser add-ons. In some cases, however, crashes occur even when running with browser
Posted by EricLaw | 1 Comments
Saturday, October 10, 2009 4:51 PM

Understanding DEP/NX

Despite being one of the crucial security features of modern browsers, Data Execution Prevention / No Execute (DEP/NX) is not well understood by most users, even technical experts without a security background. In this post, I’ll try to provide some insight
Posted by EricLaw | 4 Comments
Friday, October 09, 2009 3:17 AM

DotNet UserControls Restricted in IE8

In the past, Internet Explorer supported a really easy way to host .NET UserControls in HTML. These controls worked much like ActiveX controls, but because they ran with limited permissions, sandboxed by the .NET Framework, they would download and run
Posted by EricLaw | 2 Comments
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Thursday, October 08, 2009 3:19 AM

The User-Agent String: Use and Abuse

When I first joined the IE team five years ago, I became responsible for the User-Agent string. While I’ve owned significantly more “important” features over the years, on a byte-for-byte basis, few have proved as complicated as the “simple” UA string.
Posted by EricLaw | 12 Comments
Tuesday, October 06, 2009 4:08 PM

Good News: Microsoft Security Essentials Released

Microsoft’s free new anti-virus / anti-malware realtime scanner is now available as a free download . Installing MSE, a traditional signature-based scanner, alongside IE8’s URL Reputation-based SmartScreen Filter yields comprehensive protection to help
Posted by EricLaw | 0 Comments
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Friday, October 02, 2009 10:55 PM

Internet Explorer Cannot Download https://something

Earlier today, I was asked to troubleshoot a secure site where file downloads were always failing. Having seen this problem many times often over the years, I immediately suspected that the web developer wasn’t aware that if a user tries to download *
Posted by EricLaw | 14 Comments
Friday, October 02, 2009 1:11 AM

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
Posted by EricLaw | 0 Comments
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