[2.7] bpo-39503: CVE-2020-8492: Fix AbstractBasicAuthHandler #19302
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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 <[email protected]> (cherry picked from commit 0b297d4) Co-authored-by: Victor Stinner <[email protected]> Signed-off-by: Tapas Kundu <[email protected]>
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Need to rework, will raise fresh. |
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Python 2.7 no longer accept security fixes: https://devguide.python.org/#status-of-python-branches |
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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 [email protected]
(cherry picked from commit 0b297d4)
Co-authored-by: Victor Stinner [email protected]
Signed-off-by: Tapas Kundu [email protected]
https://bugs.python.org/issue39503