Cross-site Scripting (XSS) Affecting python-lxml-debuginfo package, versions <0:3.2.1-4.amzn2.0.6


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
4.03% (90th percentile)

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  • Snyk IDSNYK-AMZN2-PYTHONLXMLDEBUGINFO-7681932
  • published14 Aug 2024
  • disclosed21 Mar 2021

Introduced: 21 Mar 2021

CVE-2021-28957  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python-lxml-debuginfo to version 0:3.2.1-4.amzn2.0.6 or higher.
This issue was patched in ALAS2-2024-2620.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-lxml-debuginfo package and not the python-lxml-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

CVSS Base Scores

version 3.1