Compare commits
No commits in common. 'c8-stream-3.8' and 'c9' have entirely different histories.
c8-stream-
...
c9
@ -1 +1 @@
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SOURCES/lxml-4.4.1.tgz
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SOURCES/lxml-4.6.5.tar.gz
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@ -1 +1 @@
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96e0239b6524cb376f4f4d440e84da82691d278a SOURCES/lxml-4.4.1.tgz
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04a3ed4d33a511b5796880461b0edb6f3b144547 SOURCES/lxml-4.6.5.tar.gz
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@ -1,139 +0,0 @@
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From db649273fd6a2e3a624545b6fd14e8d8029198f8 Mon Sep 17 00:00:00 2001
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|
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Thu, 3 Dec 2020 11:53:15 +0100
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Subject: [PATCH] CVE-2020-27783
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|
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|
|
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Combines fixes for the CVE from two versions:
|
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- Version 4.6.1: https://github.com/lxml/lxml/commit/89e7aad6e7ff9ecd88678ff25f885988b184b26e
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|
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- Version 4.6.2: https://github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7
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---
|
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src/lxml/html/clean.py | 25 +++++++++++++++++--------
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src/lxml/html/tests/test_clean.py | 21 +++++++++++++++++++++
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src/lxml/html/tests/test_clean.txt | 12 ++++++++++--
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3 files changed, 48 insertions(+), 10 deletions(-)
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diff --git a/src/lxml/html/clean.py b/src/lxml/html/clean.py
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index aa9fc57..15298b5 100644
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--- a/src/lxml/html/clean.py
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+++ b/src/lxml/html/clean.py
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@@ -61,12 +61,15 @@ __all__ = ['clean_html', 'clean', 'Cleaner', 'autolink', 'autolink_html',
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# This is an IE-specific construct you can have in a stylesheet to
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# run some Javascript:
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-_css_javascript_re = re.compile(
|
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- r'expression\s*\(.*?\)', re.S|re.I)
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+_replace_css_javascript = re.compile(
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+ r'expression\s*\(.*?\)', re.S|re.I).sub
|
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|
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# Do I have to worry about @\nimport?
|
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-_css_import_re = re.compile(
|
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- r'@\s*import', re.I)
|
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+_replace_css_import = re.compile(
|
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+ r'@\s*import', re.I).sub
|
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+
|
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+_looks_like_tag_content = re.compile(
|
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+ r'</?[a-zA-Z]+|\son[a-zA-Z]+\s*=', re.ASCII).search
|
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|
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# All kinds of schemes besides just javascript: that can cause
|
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# execution:
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@@ -292,8 +295,8 @@ class Cleaner(object):
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if not self.inline_style:
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for el in _find_styled_elements(doc):
|
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old = el.get('style')
|
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- new = _css_javascript_re.sub('', old)
|
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- new = _css_import_re.sub('', new)
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+ new = _replace_css_javascript('', old)
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+ new = _replace_css_import('', new)
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if self._has_sneaky_javascript(new):
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# Something tricky is going on...
|
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del el.attrib['style']
|
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@@ -305,9 +308,9 @@ class Cleaner(object):
|
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el.drop_tree()
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continue
|
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old = el.text or ''
|
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- new = _css_javascript_re.sub('', old)
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+ new = _replace_css_javascript('', old)
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# The imported CSS can do anything; we just can't allow:
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- new = _css_import_re.sub('', old)
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+ new = _replace_css_import('', new)
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if self._has_sneaky_javascript(new):
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# Something tricky is going on...
|
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el.text = '/* deleted */'
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@@ -509,6 +512,12 @@ class Cleaner(object):
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return True
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if 'expression(' in style:
|
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return True
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+ if '</noscript' in style:
|
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+ # e.g. '<noscript><style><a title="</noscript><img src=x onerror=alert(1)>">'
|
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+ return True
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|
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+ if _looks_like_tag_content(style):
|
|
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+ # e.g. '<math><style><img src=x onerror=alert(1)></style></math>'
|
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+ return True
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return False
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|
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def clean_html(self, html):
|
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diff --git a/src/lxml/html/tests/test_clean.py b/src/lxml/html/tests/test_clean.py
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index a193d99..ea7487c 100644
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--- a/src/lxml/html/tests/test_clean.py
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+++ b/src/lxml/html/tests/test_clean.py
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@@ -69,6 +69,27 @@ class CleanerTest(unittest.TestCase):
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self.assertEqual('child', clean_html(s).text_content())
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|
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|
|
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|
|
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+ def test_sneaky_noscript_in_style(self):
|
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+ # This gets parsed as <noscript> -> <style>"...</noscript>..."</style>
|
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+ # thus passing the </noscript> through into the output.
|
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+ html = '<noscript><style><a title="</noscript><img src=x onerror=alert(1)>">'
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+ s = lxml.html.fragment_fromstring(html)
|
|
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+
|
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+ self.assertEqual(
|
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+ b'<noscript><style>/* deleted */</style></noscript>',
|
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+ lxml.html.tostring(clean_html(s)))
|
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+
|
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+ def test_sneaky_js_in_math_style(self):
|
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+ # This gets parsed as <math> -> <style>"..."</style>
|
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+ # thus passing any tag/script/whatever content through into the output.
|
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+ html = '<math><style><img src=x onerror=alert(1)></style></math>'
|
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+ s = lxml.html.fragment_fromstring(html)
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+
|
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+ self.assertEqual(
|
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+ b'<math><style>/* deleted */</style></math>',
|
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+ lxml.html.tostring(clean_html(s)))
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+
|
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+
|
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def test_suite():
|
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suite = unittest.TestSuite()
|
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suite.addTests([make_doctest('test_clean.txt')])
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diff --git a/src/lxml/html/tests/test_clean.txt b/src/lxml/html/tests/test_clean.txt
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index 2824f64..7df1f1d 100644
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--- a/src/lxml/html/tests/test_clean.txt
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+++ b/src/lxml/html/tests/test_clean.txt
|
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@@ -104,7 +104,11 @@
|
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>>> print(Cleaner(page_structure=False, safe_attrs_only=False).clean_html(doc))
|
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<html>
|
|
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<head>
|
|
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- <style>/* deleted */</style>
|
|
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+ <style>
|
|
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+ body {background-image: url()};
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|
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+ div {background-image: url()};
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|
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+ div {color: };
|
|
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+ </style>
|
|
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</head>
|
|
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<body>
|
|
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<a href="">a link</a>
|
|
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@@ -168,7 +172,11 @@
|
|
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<link rel="alternate" type="text/rss" src="evil-rss">
|
|
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<link rel="alternate" type="text/rss" href="http://example.com">
|
|
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<link rel="stylesheet" type="text/rss" href="http://example.com">
|
|
||||||
- <style>/* deleted */</style>
|
|
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+ <style>
|
|
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+ body {background-image: url()};
|
|
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+ div {background-image: url()};
|
|
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+ div {color: };
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|
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+ </style>
|
|
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</head>
|
|
||||||
<body>
|
|
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<a href="">a link</a>
|
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--
|
|
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2.28.0
|
|
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|
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@ -1,39 +0,0 @@
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diff --git a/src/lxml/html/defs.py b/src/lxml/html/defs.py
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|
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index caf6b21..ea3c016 100644
|
|
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--- a/src/lxml/html/defs.py
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|
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+++ b/src/lxml/html/defs.py
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|
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@@ -21,6 +21,8 @@ link_attrs = frozenset([
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|
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'usemap',
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|
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# Not standard:
|
|
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'dynsrc', 'lowsrc',
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|
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+ # HTML5 formaction
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|
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+ 'formaction'
|
|
||||||
])
|
|
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|
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# Not in the HTML 4 spec:
|
|
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diff --git a/src/lxml/html/tests/test_clean.py b/src/lxml/html/tests/test_clean.py
|
|
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index 451eec2..e40cdad 100644
|
|
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--- a/src/lxml/html/tests/test_clean.py
|
|
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+++ b/src/lxml/html/tests/test_clean.py
|
|
||||||
@@ -89,6 +89,21 @@ class CleanerTest(unittest.TestCase):
|
|
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b'<math><style>/* deleted */</style></math>',
|
|
||||||
lxml.html.tostring(clean_html(s)))
|
|
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|
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||||||
+ def test_formaction_attribute_in_button_input(self):
|
|
||||||
+ # The formaction attribute overrides the form's action and should be
|
|
||||||
+ # treated as a malicious link attribute
|
|
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+ html = ('<form id="test"><input type="submit" formaction="javascript:alert(1)"></form>'
|
|
||||||
+ '<button form="test" formaction="javascript:alert(1)">X</button>')
|
|
||||||
+ expected = ('<div><form id="test"><input type="submit" formaction=""></form>'
|
|
||||||
+ '<button form="test" formaction="">X</button></div>')
|
|
||||||
+ cleaner = Cleaner(
|
|
||||||
+ forms=False,
|
|
||||||
+ safe_attrs_only=False,
|
|
||||||
+ )
|
|
||||||
+ self.assertEqual(
|
|
||||||
+ expected,
|
|
||||||
+ cleaner.clean_html(html))
|
|
||||||
+
|
|
||||||
|
|
||||||
def test_suite():
|
|
||||||
suite = unittest.TestSuite()
|
|
||||||
@ -1,127 +0,0 @@
|
|||||||
diff --git a/src/lxml/html/clean.py b/src/lxml/html/clean.py
|
|
||||||
index 15298b5..ee2f0f8 100644
|
|
||||||
--- a/src/lxml/html/clean.py
|
|
||||||
+++ b/src/lxml/html/clean.py
|
|
||||||
@@ -73,18 +73,25 @@ _looks_like_tag_content = re.compile(
|
|
||||||
|
|
||||||
# All kinds of schemes besides just javascript: that can cause
|
|
||||||
# execution:
|
|
||||||
-_is_image_dataurl = re.compile(
|
|
||||||
- r'^data:image/.+;base64', re.I).search
|
|
||||||
+_find_image_dataurls = re.compile(
|
|
||||||
+ r'^data:image/(.+);base64,', re.I).findall
|
|
||||||
_is_possibly_malicious_scheme = re.compile(
|
|
||||||
- r'(?:javascript|jscript|livescript|vbscript|data|about|mocha):',
|
|
||||||
- re.I).search
|
|
||||||
+ r'(javascript|jscript|livescript|vbscript|data|about|mocha):',
|
|
||||||
+ re.I).findall
|
|
||||||
+# SVG images can contain script content
|
|
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+_is_unsafe_image_type = re.compile(r"(xml|svg)", re.I).findall
|
|
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+
|
|
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def _is_javascript_scheme(s):
|
|
||||||
- if _is_image_dataurl(s):
|
|
||||||
- return None
|
|
||||||
- return _is_possibly_malicious_scheme(s)
|
|
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+ is_image_url = False
|
|
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+ for image_type in _find_image_dataurls(s):
|
|
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+ is_image_url = True
|
|
||||||
+ if _is_unsafe_image_type(image_type):
|
|
||||||
+ return True
|
|
||||||
+ if is_image_url:
|
|
||||||
+ return False
|
|
||||||
+ return bool(_is_possibly_malicious_scheme(s))
|
|
||||||
|
|
||||||
_substitute_whitespace = re.compile(r'[\s\x00-\x08\x0B\x0C\x0E-\x19]+').sub
|
|
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-# FIXME: should data: be blocked?
|
|
||||||
|
|
||||||
# FIXME: check against: http://msdn2.microsoft.com/en-us/library/ms537512.aspx
|
|
||||||
_conditional_comment_re = re.compile(
|
|
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@@ -512,6 +519,8 @@ class Cleaner(object):
|
|
||||||
return True
|
|
||||||
if 'expression(' in style:
|
|
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return True
|
|
||||||
+ if '@import' in style:
|
|
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+ return True
|
|
||||||
if '</noscript' in style:
|
|
||||||
# e.g. '<noscript><style><a title="</noscript><img src=x onerror=alert(1)>">'
|
|
||||||
return True
|
|
||||||
diff --git a/src/lxml/html/tests/test_clean.py b/src/lxml/html/tests/test_clean.py
|
|
||||||
index d8df527..7021e48 100644
|
|
||||||
--- a/src/lxml/html/tests/test_clean.py
|
|
||||||
+++ b/src/lxml/html/tests/test_clean.py
|
|
||||||
@@ -1,3 +1,5 @@
|
|
||||||
+import base64
|
|
||||||
+import gzip
|
|
||||||
import unittest
|
|
||||||
from lxml.tests.common_imports import make_doctest
|
|
||||||
|
|
||||||
@@ -89,6 +91,69 @@ class CleanerTest(unittest.TestCase):
|
|
||||||
b'<math><style>/* deleted */</style></math>',
|
|
||||||
lxml.html.tostring(clean_html(s)))
|
|
||||||
|
|
||||||
+ def test_sneaky_import_in_style(self):
|
|
||||||
+ # Prevent "@@importimport" -> "@import" replacement.
|
|
||||||
+ style_codes = [
|
|
||||||
+ "@@importimport(extstyle.css)",
|
|
||||||
+ "@ @ import import(extstyle.css)",
|
|
||||||
+ "@ @ importimport(extstyle.css)",
|
|
||||||
+ "@@ import import(extstyle.css)",
|
|
||||||
+ "@ @import import(extstyle.css)",
|
|
||||||
+ "@@importimport()",
|
|
||||||
+ ]
|
|
||||||
+ for style_code in style_codes:
|
|
||||||
+ html = '<style>%s</style>' % style_code
|
|
||||||
+ s = lxml.html.fragment_fromstring(html)
|
|
||||||
+
|
|
||||||
+ cleaned = lxml.html.tostring(clean_html(s))
|
|
||||||
+ self.assertEqual(
|
|
||||||
+ b'<style>/* deleted */</style>',
|
|
||||||
+ cleaned,
|
|
||||||
+ "%s -> %s" % (style_code, cleaned))
|
|
||||||
+
|
|
||||||
+ def test_svg_data_links(self):
|
|
||||||
+ # Remove SVG images with potentially insecure content.
|
|
||||||
+ svg = b'<svg onload="alert(123)" />'
|
|
||||||
+ svgz = gzip.compress(svg)
|
|
||||||
+ svg_b64 = base64.b64encode(svg).decode('ASCII')
|
|
||||||
+ svgz_b64 = base64.b64encode(svgz).decode('ASCII')
|
|
||||||
+ urls = [
|
|
||||||
+ "data:image/svg+xml;base64," + svg_b64,
|
|
||||||
+ "data:image/svg+xml-compressed;base64," + svgz_b64,
|
|
||||||
+ ]
|
|
||||||
+ for url in urls:
|
|
||||||
+ html = '<img src="%s">' % url
|
|
||||||
+ s = lxml.html.fragment_fromstring(html)
|
|
||||||
+
|
|
||||||
+ cleaned = lxml.html.tostring(clean_html(s))
|
|
||||||
+ self.assertEqual(
|
|
||||||
+ b'<img src="">',
|
|
||||||
+ cleaned,
|
|
||||||
+ "%s -> %s" % (url, cleaned))
|
|
||||||
+
|
|
||||||
+ def test_image_data_links(self):
|
|
||||||
+ data = b'123'
|
|
||||||
+ data_b64 = base64.b64encode(data).decode('ASCII')
|
|
||||||
+ urls = [
|
|
||||||
+ "data:image/jpeg;base64," + data_b64,
|
|
||||||
+ "data:image/apng;base64," + data_b64,
|
|
||||||
+ "data:image/png;base64," + data_b64,
|
|
||||||
+ "data:image/gif;base64," + data_b64,
|
|
||||||
+ "data:image/webp;base64," + data_b64,
|
|
||||||
+ "data:image/bmp;base64," + data_b64,
|
|
||||||
+ "data:image/tiff;base64," + data_b64,
|
|
||||||
+ "data:image/x-icon;base64," + data_b64,
|
|
||||||
+ ]
|
|
||||||
+ for url in urls:
|
|
||||||
+ html = '<img src="%s">' % url
|
|
||||||
+ s = lxml.html.fragment_fromstring(html)
|
|
||||||
+
|
|
||||||
+ cleaned = lxml.html.tostring(clean_html(s))
|
|
||||||
+ self.assertEqual(
|
|
||||||
+ html.encode("UTF-8"),
|
|
||||||
+ cleaned,
|
|
||||||
+ "%s -> %s" % (url, cleaned))
|
|
||||||
+
|
|
||||||
def test_formaction_attribute_in_button_input(self):
|
|
||||||
# The formaction attribute overrides the form's action and should be
|
|
||||||
# treated as a malicious link attribute
|
|
||||||
@ -0,0 +1,104 @@
|
|||||||
|
diff --git a/src/lxml/apihelpers.pxi b/src/lxml/apihelpers.pxi
|
||||||
|
index 5eb3416..88a031d 100644
|
||||||
|
--- a/src/lxml/apihelpers.pxi
|
||||||
|
+++ b/src/lxml/apihelpers.pxi
|
||||||
|
@@ -246,9 +246,10 @@ cdef dict _build_nsmap(xmlNode* c_node):
|
||||||
|
while c_node is not NULL and c_node.type == tree.XML_ELEMENT_NODE:
|
||||||
|
c_ns = c_node.nsDef
|
||||||
|
while c_ns is not NULL:
|
||||||
|
- prefix = funicodeOrNone(c_ns.prefix)
|
||||||
|
- if prefix not in nsmap:
|
||||||
|
- nsmap[prefix] = funicodeOrNone(c_ns.href)
|
||||||
|
+ if c_ns.prefix or c_ns.href:
|
||||||
|
+ prefix = funicodeOrNone(c_ns.prefix)
|
||||||
|
+ if prefix not in nsmap:
|
||||||
|
+ nsmap[prefix] = funicodeOrNone(c_ns.href)
|
||||||
|
c_ns = c_ns.next
|
||||||
|
c_node = c_node.parent
|
||||||
|
return nsmap
|
||||||
|
diff --git a/src/lxml/includes/xmlparser.pxd b/src/lxml/includes/xmlparser.pxd
|
||||||
|
index a196e34..45acfc8 100644
|
||||||
|
--- a/src/lxml/includes/xmlparser.pxd
|
||||||
|
+++ b/src/lxml/includes/xmlparser.pxd
|
||||||
|
@@ -144,6 +144,7 @@ cdef extern from "libxml/parser.h":
|
||||||
|
void* userData
|
||||||
|
int* spaceTab
|
||||||
|
int spaceMax
|
||||||
|
+ int nsNr
|
||||||
|
bint html
|
||||||
|
bint progressive
|
||||||
|
int inSubset
|
||||||
|
diff --git a/src/lxml/iterparse.pxi b/src/lxml/iterparse.pxi
|
||||||
|
index 4c20506..3da7485 100644
|
||||||
|
--- a/src/lxml/iterparse.pxi
|
||||||
|
+++ b/src/lxml/iterparse.pxi
|
||||||
|
@@ -419,7 +419,7 @@ cdef int _countNsDefs(xmlNode* c_node):
|
||||||
|
count = 0
|
||||||
|
c_ns = c_node.nsDef
|
||||||
|
while c_ns is not NULL:
|
||||||
|
- count += 1
|
||||||
|
+ count += (c_ns.href is not NULL)
|
||||||
|
c_ns = c_ns.next
|
||||||
|
return count
|
||||||
|
|
||||||
|
@@ -430,9 +430,10 @@ cdef int _appendStartNsEvents(xmlNode* c_node, list event_list) except -1:
|
||||||
|
count = 0
|
||||||
|
c_ns = c_node.nsDef
|
||||||
|
while c_ns is not NULL:
|
||||||
|
- ns_tuple = (funicode(c_ns.prefix) if c_ns.prefix is not NULL else '',
|
||||||
|
- funicode(c_ns.href))
|
||||||
|
- event_list.append( (u"start-ns", ns_tuple) )
|
||||||
|
- count += 1
|
||||||
|
+ if c_ns.href:
|
||||||
|
+ ns_tuple = (funicodeOrEmpty(c_ns.prefix),
|
||||||
|
+ funicode(c_ns.href))
|
||||||
|
+ event_list.append( (u"start-ns", ns_tuple) )
|
||||||
|
+ count += 1
|
||||||
|
c_ns = c_ns.next
|
||||||
|
return count
|
||||||
|
diff --git a/src/lxml/parser.pxi b/src/lxml/parser.pxi
|
||||||
|
index 3ed223b..f5ff6b2 100644
|
||||||
|
--- a/src/lxml/parser.pxi
|
||||||
|
+++ b/src/lxml/parser.pxi
|
||||||
|
@@ -569,6 +569,9 @@ cdef class _ParserContext(_ResolverContext):
|
||||||
|
self._c_ctxt.disableSAX = 0 # work around bug in libxml2
|
||||||
|
else:
|
||||||
|
xmlparser.xmlClearParserCtxt(self._c_ctxt)
|
||||||
|
+ # work around bug in libxml2 [2.9.10 .. 2.9.14]:
|
||||||
|
+ # https://gitlab.gnome.org/GNOME/libxml2/-/issues/378
|
||||||
|
+ self._c_ctxt.nsNr = 0
|
||||||
|
|
||||||
|
cdef int prepare(self, bint set_document_loader=True) except -1:
|
||||||
|
cdef int result
|
||||||
|
diff --git a/src/lxml/tests/test_etree.py b/src/lxml/tests/test_etree.py
|
||||||
|
index 42613dc..db1f560 100644
|
||||||
|
--- a/src/lxml/tests/test_etree.py
|
||||||
|
+++ b/src/lxml/tests/test_etree.py
|
||||||
|
@@ -1459,6 +1459,27 @@ class ETreeOnlyTestCase(HelperTestCase):
|
||||||
|
[1,2,1,4],
|
||||||
|
counts)
|
||||||
|
|
||||||
|
+ def test_walk_after_parse_failure(self):
|
||||||
|
+ # This used to be an issue because libxml2 can leak empty namespaces
|
||||||
|
+ # between failed parser runs. iterwalk() failed to handle such a tree.
|
||||||
|
+ parser = etree.XMLParser()
|
||||||
|
+
|
||||||
|
+ try:
|
||||||
|
+ etree.XML('''<anot xmlns="1">''', parser=parser)
|
||||||
|
+ except etree.XMLSyntaxError:
|
||||||
|
+ pass
|
||||||
|
+ else:
|
||||||
|
+ assert False, "invalid input did not fail to parse"
|
||||||
|
+
|
||||||
|
+ et = etree.XML('''<root> </root>''', parser=parser)
|
||||||
|
+ try:
|
||||||
|
+ ns = next(etree.iterwalk(et, events=('start-ns',)))
|
||||||
|
+ except StopIteration:
|
||||||
|
+ # This would be the expected result, because there was no namespace
|
||||||
|
+ pass
|
||||||
|
+ else:
|
||||||
|
+ assert False, "Found unexpected namespace '%s'" % ns
|
||||||
|
+
|
||||||
|
def test_itertext_comment_pi(self):
|
||||||
|
# https://bugs.launchpad.net/lxml/+bug/1844674
|
||||||
|
XML = self.etree.XML
|
||||||
Loading…
Reference in new issue