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CVE-2021-3733-fix-ReDoS-in-request.patch
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File CVE-2021-3733-fix-ReDoS-in-request.patch of Package Python
--- a/Lib/urllib2.py +++ b/Lib/urllib2.py @@ -856,7 +856,7 @@ class AbstractBasicAuthHandler: # allow for double- and single-quoted realm values # (single quotes are a violation of the RFC, but appear in the wild) - rx = re.compile('(?:[^,]*,)*[ \t]*([^ \t]+)[ \t]+' + rx = re.compile('(?:[^,]*,)*[ \t]*([^ \t,]+)[ \t]+' 'realm=(["\']?)([^"\']*)\\2', re.I) # XXX could pre-emptively send auth info already accepted (RFC 2617, --- /dev/null +++ b/Misc/NEWS.d/next/Security/2021-01-31-05-28-14.bpo-43075.DoAXqO.rst @@ -0,0 +1 @@ +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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