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Fix CVE-2019-9636

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Implemented fix from python/cpython#12201 for CVE-2019-9636 in /lib/future/backports/urllib/parse.py
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Akansh 2023-01-12 04:14:58 -05:00
commit eb0707c555
1 changed files with 21 additions and 0 deletions
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21
lib/future/backports/urllib/parse.py
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@ -36,6 +36,7 @@ from future.utils import raise_with_traceback
import re
import sys
import collections
import unicodedata
__all__ = ["urlparse", "urlunparse", "urljoin", "urldefrag",
"urlsplit", "urlunsplit", "urlencode", "parse_qs",
@ -322,6 +323,24 @@ def _splitnetloc(url, start=0):
delim = min(delim, wdelim) # use earliest delim position
return url[start:delim], url[delim:] # return (domain, rest)
def _checknetloc(netloc):
if not netloc or netloc.isascii():
return
# looking for characters like \u2100 that expand to 'a/c'
# IDNA uses NFKC equivalence, so normalize for this check
import unicodedata
n = netloc.replace('@', '') # ignore characters already included
n = n.replace(':', '') # but not the surrounding text
n = n.replace('#', '')
n = n.replace('?', '')
netloc2 = unicodedata.normalize('NFKC', n)
if n == netloc2:
return
for c in '/?#@:':
if c in netloc2:
raise ValueError("netloc '" + netloc + "' contains invalid " +
"characters under NFKC normalization")
def urlsplit(url, scheme='', allow_fragments=True):
"""Parse a URL into 5 components:
<scheme>://<netloc>/<path>?<query>#<fragment>
@ -351,6 +370,7 @@ def urlsplit(url, scheme='', allow_fragments=True):
url, fragment = url.split('#', 1)
if '?' in url:
url, query = url.split('?', 1)
_checknetloc(netloc)
v = SplitResult(scheme, netloc, url, query, fragment)
_parse_cache[key] = v
return _coerce_result(v)
@ -374,6 +394,7 @@ def urlsplit(url, scheme='', allow_fragments=True):
url, fragment = url.split('#', 1)
if '?' in url:
url, query = url.split('?', 1)
_checknetloc(netloc)
v = SplitResult(scheme, netloc, url, query, fragment)
_parse_cache[key] = v
return _coerce_result(v)