The version of python-lxml installed on the remote host is prior to 3.2.1-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-1956 advisory.

    Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote     attackers to conduct cross-site scripting (XSS) attacks via control characters in the link scheme to the     clean_html function. (CVE-2014-3146)

    An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not     remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as     demonstrated by j a v a s c r i p t: in Internet Explorer. This is a similar issue to CVE-2014-3146.
    (CVE-2018-19787)

    There's a flaw in python-lxml's HTML Cleaner component, which is responsible for sanitizing HTML and     Javascript. An attacker who is able to submit a crafted payload to a web service using python-lxml's HTML     Cleaner may be able to trigger script execution in clients such as web browsers. This can occur because     the HTML Cleaner did not remove scripts within SVG images in data URLs such as <img src=>. XSS can result     in impacts to the integrity and availability of the web page, as well as a potential impact to data     confidentiality in some circumstances. (CVE-2021-43818)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Amazon Linux 2 : python-lxml (ALAS-2023-1956)

high Nessus Plugin ID 171803

Version 1.4

Version 1.1

Version 1.0

Version 1.4 Mar 17, 2025, 12:07 PM Exploit attributes ("Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202503171207
Version 1.1 Dec 12, 2024, 9:55 AM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202412120955
Version 1.0 Feb 23, 2023, 5:54 AM New Plugin Feed: 202302230554