[3.5] closes bpo-38576: Disallow control characters in hostnames in h… #19231
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epicfaace
approved these changes
Mar 31, 2020
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]> Signed-off-by: Tapas Kundu <[email protected]>
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…ttp.client.
Add host validation for control characters for more
CVE-2019-18348 protection.
(cherry picked from commit 83fc701)
Co-authored-by: Ashwin Ramaswami [email protected]
Signed-off-by: Tapas Kundu [email protected]
https://bugs.python.org/issue38576