[issue4489] shutil.rmtree is vulnerable to a symlink attack

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

Updated patch removes the race condition. Since an open follows symlinks, you can't just fstat the fd to see if it is a link. I followed the following to overcome this:
https://www.securecoding.cert.org/confluence/display/seccode/POS35-C.+Avoid+race+conditions+while+checking+for+the+existence+of+a+symbolic+link

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Added file: http://bugs.python.org/file20277/i4489_v2.patch

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