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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Tue, 14 Sep 2021 11:34:43 +0200
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Subject: [PATCH] 00366-CVE-2021-3733.patch
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00366 #
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CVE-2021-3733: Fix ReDoS in urllib AbstractBasicAuthHandler
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Fix Regular Expression Denial of Service (ReDoS) vulnerability in
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urllib2.AbstractBasicAuthHandler. The ReDoS-vulnerable regex
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has quadratic worst-case complexity and it allows cause a denial of
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service when identifying crafted invalid RFCs. This ReDoS issue is on
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the client side and needs remote attackers to control the HTTP server.
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Backported from Python 3 together with another backward-compatible
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improvement of the regex from fix for CVE-2020-8492.
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Co-authored-by: Yeting Li <liyt@ios.ac.cn>
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---
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Lib/urllib2.py | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/Lib/urllib2.py b/Lib/urllib2.py
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index fd19e1ae943..e286583ecba 100644
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--- a/Lib/urllib2.py
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+++ b/Lib/urllib2.py
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@@ -858,7 +858,7 @@ class AbstractBasicAuthHandler:
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# allow for double- and single-quoted realm values
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# (single quotes are a violation of the RFC, but appear in the wild)
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- rx = re.compile('(?:.*,)*[ \t]*([^ \t]+)[ \t]+'
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+ rx = re.compile('(?:[^,]*,)*[ \t]*([^ \t,]+)[ \t]+'
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'realm=(["\']?)([^"\']*)\\2', re.I)
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# XXX could pre-emptively send auth info already accepted (RFC 2617,
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