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v0.5.1
Revision ea9e240aa02372440be8024acb110371f69c9d41 authored by Miss Islington (bot) on 02 April 2020, 10:15:55 UTC, committed by GitHub on 02 April 2020, 10:15:55 UTC 
bpo-39503: CVE-2020-8492: Fix AbstractBasicAuthHandler (GH-18284) (GH-19296)
 
The AbstractBasicAuthHandler class of the urllib.request module uses
an inefficient regular expression which can be exploited by an
attacker to cause a denial of service. Fix the regex to prevent the
catastrophic backtracking. Vulnerability reported by Ben Caller
and Matt Schwager.

AbstractBasicAuthHandler of urllib.request now parses all
WWW-Authenticate HTTP headers and accepts multiple challenges per
header: use the realm of the first Basic challenge.

Co-Authored-By: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

(cherry picked from commit 0b297d4ff1c0e4480ad33acae793fbaf4bf015b4)
1 parent 40fff1f
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