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Microsoft warns of web proxy flaw

Daniel Fleshbourne   on 04 December 2007 - 13:07 · 5 comments & 5585 views

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Microsoft has reported a flaw in the way Windows and Internet Explorer handle web proxy auto discover (WPAD) connections. WPAD servers are used to deliver connecting computers with web proxy information. Microsoft said that the problem occurs when the WPAD servers for third-level domains (such as .co.uk) and deeper cannot be found. The user is then redirected to a WPAD server for a higher domain.

This can eventually lead the user to access a WPAD server outside the intended domain, possibly to one that has been compromised by a hacker. All current versions of Windows and Internet Explorer are affected by the flaw, which was discovered by researcher Beau Butler. Microsoft has not received any reports of attacks targeting the vulnerability in the wild.

View: The full story @ vnunet

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(1 reply) #1 outlando on 04 Dec 2007 - 15:09
What's this? Microsoft issued the warning themselves? Don't they normally wait for hundreds of users' systems to be compromised first, and then let someone else warn the community at large?
#1.1 vetmarkjensen on 04 Dec 2007 - 20:39
The cat was let out of the bag a few days ago. http://www.crn.com/security/204300485

But good to see that Microsoft has confirmed this, and is (presumably) working on a patch.
Quote -
Microsoft said that it is investigating the issue, but did not say when a patch would be released. The company's next scheduled security update is on 11 December.
(2 replies) #2 Croquant on 04 Dec 2007 - 15:23
Are you affected if you use Firefox and not IE? I'm thinking no.
#2.1 seamer on 04 Dec 2007 - 22:53
Quote - (Croquant said @ #2)
Are you affected if you use Firefox and not IE? I'm thinking no.


Someone didn't read the article. It clearly states "Internet Explorer and other browsers". This is something I may agree with, my firewall logs show lots of wpad requests even with Firefox as the enforced browser within the network.
#2.2 Croquant on 05 Dec 2007 - 02:55
Quote - (seamer said @ #2.1)
Quote - (Croquant said @ #2)
Are you affected if you use Firefox and not IE? I'm thinking no.


Someone didn't read the article. It clearly states "Internet Explorer and other browsers". This is something I may agree with, my firewall logs show lots of wpad requests even with Firefox as the enforced browser within the network.

Someone needs to learn how to read. "other browsers" is a rather ambiguous statement. It's not very specific. If it said "all other browsers" or "other browsers including Firefox" then I might have thought that Firefox is affected. But it doesn't. Hence my venturing to guess that Firefox is unaffected. I'm assuming these "other browser" the article refers to are other IE-based browser (Maxathlon, et al.)

Oh, and EXCUSE ME for asking a question.

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