[3.5] bpo-39503: CVE-2020-8492: Fix AbstractBasicAuthHandler #19301
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tapakund
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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 Signed-off-by: Tapas Kundu <tkundu@vmware.com>
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Need rework. Will reopen later. |
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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
Signed-off-by: Tapas Kundu tkundu@vmware.com
https://bugs.python.org/issue39503