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CVE-2021-43818

Public on 2021-12-13
Modified on 2024-01-23
Description

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.

Severity
Important
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CVSS v3 Base Score
7.1
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 python-lxml 2023-03-17 15:53 ALAS-2023-1709
Amazon Linux 2 - Core python-lxml 2023-02-17 00:12 ALAS2-2023-1956
Amazon Linux 2023 python-lxml 2023-02-17 20:44 ALAS2023-2023-034

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
NVD CVSSv3 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
NVD CVSSv2 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P