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From 29c669440dddba61d18e1b7fdd57180cae9e4ae3 Mon Sep 17 00:00:00 2001
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From: Yeting Li <liyt@ios.ac.cn>
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Date: Wed, 7 Apr 2021 19:27:41 +0800
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Subject: [PATCH] bpo-43075: Fix ReDoS in urllib AbstractBasicAuthHandler
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(GH-24391)
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Fix Regular Expression Denial of Service (ReDoS) vulnerability in
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urllib.request.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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(cherry picked from commit 7215d1ae25525c92b026166f9d5cac85fb1defe1)
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Co-authored-by: Yeting Li <liyt@ios.ac.cn>
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---
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Lib/urllib/request.py | 2 +-
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.../next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst | 1 +
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2 files changed, 2 insertions(+), 1 deletion(-)
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create mode 100644 Misc/NEWS.d/next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst
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diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
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index 6624e04317ba2..56565405a7097 100644
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--- a/Lib/urllib/request.py
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+++ b/Lib/urllib/request.py
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@@ -947,7 +947,7 @@ class AbstractBasicAuthHandler:
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# (single quotes are a violation of the RFC, but appear in the wild)
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rx = re.compile('(?:^|,)' # start of the string or ','
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'[ \t]*' # optional whitespaces
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- '([^ \t]+)' # scheme like "Basic"
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+ '([^ \t,]+)' # scheme like "Basic"
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'[ \t]+' # mandatory whitespaces
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# realm=xxx
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# realm='xxx'
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diff --git a/Misc/NEWS.d/next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst b/Misc/NEWS.d/next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst
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new file mode 100644
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index 0000000000000..1c9f727e965fb
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst
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@@ -0,0 +1 @@
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+Fix Regular Expression Denial of Service (ReDoS) vulnerability in :class:`urllib.request.AbstractBasicAuthHandler`. The ReDoS-vulnerable regex has quadratic worst-case complexity and it allows cause a denial of service when identifying crafted invalid RFCs. This ReDoS issue is on the client side and needs remote attackers to control the HTTP server.
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