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This should fix a path enumeration issue #70

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dxa4481
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@dxa4481 dxa4481 commented Jan 20, 2015

I got rid of normilize here because join normilizes, and I added this to resolve the issue found here TeamMentor/TM_4_0_Design#206

@dougwilson
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Great! I can look into why the changes are making the tests fail.

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The change also seems to make pretty much every single test fail on Windows.

@dougwilson dougwilson self-assigned this Jan 20, 2015
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The change also seems to make pretty much every single test fail on Windows.

Looks like the main reason for the Windows failures is because join(root, path) will never equal root + path under any circumstance because of the fact that URLs have forward slashes and Windows uses backslashes in file paths.

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dxa4481 commented Jan 20, 2015

Ahh, gotcha. Sorry I didn't run the tests; I set up the test suite now and am having another go at it.

@dougwilson
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No problem :) I just haven't yet gotten to a machine to be able to look into anything yet. Your effort is greatly appreciated!

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Oh, and I think if I were to give the fix a goal, it would be that "at no point, should the path ever descend below the root".

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Ok, I got back and I have a perfect solution :)! Basically, just normalize the rhs first, then there is a simple check for a leading up directive.

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dxa4481 commented Jan 20, 2015

Oh man! That's probably simpler than what I ended up doing, but the tests pass with my latest commit

root = normalize(root + sep)

// check for exiting current dir
var traversalCheck = rawPath.split(sep);
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This still doesn't work on Windows ;) sep === '\\' on there, and path will just contain forward slashes.

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I think eventually in the far distant future we'll finally have path.split in Node.js core, haha.

@dougwilson dougwilson added the bug label Jan 20, 2015
dougwilson added a commit that referenced this pull request Jan 20, 2015
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Ok, @dxa4481 @DinisCruz if you guys want to confirm the current master (npm install tj/send) and poke at it, I would love a confirmation :) Then I'll roll it up into Express 4.11.1 and 3.19.1, and whatever else I can get my hands on.

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Great stuff, I'll take a look and its great to see such a fast fix.

I will try to also add a unit test that checks for the edge cases discovered

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Awesome, @DinisCruz :) The final commit does have one unit test (98a5b89), but if you want to add more, that would be great :)

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So far send has been published as 0.11.1

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3 participants