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Bug fix (disable HTML decoding in XSS checks)

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This commit is contained in:
Miroslav Stampar
2019-11-18 11:40:07 +01:00
parent f550a2281f
commit 0977f6df61
4 changed files with 35 additions and 29 deletions
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59
lib/request/basic.py
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@@ -334,41 +334,44 @@ def decodePage(page, contentEncoding, contentType, percentDecode=True):
# can't do for all responses because we need to support binary files too
if isinstance(page, six.binary_type) and "text/" in contentType:
# e.g. 	Ãëàâà
if b"&#" in page:
page = re.sub(b"&#x([0-9a-f]{1,2});", lambda _: decodeHex(_.group(1) if len(_.group(1)) == 2 else "0%s" % _.group(1)), page)
page = re.sub(b"&#(\\d{1,3});", lambda _: six.int2byte(int(_.group(1))) if int(_.group(1)) < 256 else _.group(0), page)
if not kb.disableHtmlDecoding:
# e.g. &#x9;&#195;&#235;&#224;&#226;&#224;
if b"&#" in page:
page = re.sub(b"&#x([0-9a-f]{1,2});", lambda _: decodeHex(_.group(1) if len(_.group(1)) == 2 else "0%s" % _.group(1)), page)
page = re.sub(b"&#(\\d{1,3});", lambda _: six.int2byte(int(_.group(1))) if int(_.group(1)) < 256 else _.group(0), page)
# e.g. %20%28%29
if percentDecode:
if b"%" in page:
page = re.sub(b"%([0-9a-fA-F]{2})", lambda _: decodeHex(_.group(1)), page)
# e.g. %20%28%29
if percentDecode:
if b"%" in page:
page = re.sub(b"%([0-9a-fA-F]{2})", lambda _: decodeHex(_.group(1)), page)
# e.g. &amp;
page = re.sub(b"&([^;]+);", lambda _: six.int2byte(HTML_ENTITIES[getText(_.group(1))]) if HTML_ENTITIES.get(getText(_.group(1)), 256) < 256 else _.group(0), page)
# e.g. &amp;
page = re.sub(b"&([^;]+);", lambda _: six.int2byte(HTML_ENTITIES[getText(_.group(1))]) if HTML_ENTITIES.get(getText(_.group(1)), 256) < 256 else _.group(0), page)
kb.pageEncoding = kb.pageEncoding or checkCharEncoding(getHeuristicCharEncoding(page))
kb.pageEncoding = kb.pageEncoding or checkCharEncoding(getHeuristicCharEncoding(page))
if (kb.pageEncoding or "").lower() == "utf-8-sig":
kb.pageEncoding = "utf-8"
if page and page.startswith("\xef\xbb\xbf"): # Reference: https://docs.python.org/2/library/codecs.html (Note: noticed problems when "utf-8-sig" is left to Python for handling)
page = page[3:]
if (kb.pageEncoding or "").lower() == "utf-8-sig":
kb.pageEncoding = "utf-8"
if page and page.startswith("\xef\xbb\xbf"): # Reference: https://docs.python.org/2/library/codecs.html (Note: noticed problems when "utf-8-sig" is left to Python for handling)
page = page[3:]
page = getUnicode(page, kb.pageEncoding)
page = getUnicode(page, kb.pageEncoding)
# e.g. &#8217;&#8230;&#8482;
if "&#" in page:
def _(match):
retVal = match.group(0)
try:
retVal = _unichr(int(match.group(1)))
except (ValueError, OverflowError):
pass
return retVal
page = re.sub(r"&#(\d+);", _, page)
# e.g. &#8217;&#8230;&#8482;
if "&#" in page:
def _(match):
retVal = match.group(0)
try:
retVal = _unichr(int(match.group(1)))
except (ValueError, OverflowError):
pass
return retVal
page = re.sub(r"&#(\d+);", _, page)
# e.g. &zeta;
page = re.sub(r"&([^;]+);", lambda _: _unichr(HTML_ENTITIES[_.group(1)]) if HTML_ENTITIES.get(_.group(1), 0) > 255 else _.group(0), page)
# e.g. &zeta;
page = re.sub(r"&([^;]+);", lambda _: _unichr(HTML_ENTITIES[_.group(1)]) if HTML_ENTITIES.get(_.group(1), 0) > 255 else _.group(0), page)
else:
page = getUnicode(page, kb.pageEncoding)
return page