CVE-2021-28957 (Medium) detected in lxml-4.2.5-cp37-cp37m-manylinux1_x86_64.whl #100

Vulnerable Library - lxml-4.2.5-cp37-cp37m-manylinux1_x86_64.whl

Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API.

Library home page: https://files.pythonhosted.org/packages/7a/6b/a3d2d3c3075617edcbfc272d79281e812b1a94dab37923b1d06fdfe2e906/lxml-4.2.5-cp37-cp37m-manylinux1_x86_64.whl

Path to dependency file: /scrapers/requirements.txt

Path to vulnerable library: /scrapers/requirements.txt

Dependency Hierarchy:

• Scrapy-1.8.2-py2.py3-none-any.whl (Root Library)
  • ❌ lxml-4.2.5-cp37-cp37m-manylinux1_x86_64.whl (Vulnerable Library)

Found in HEAD commit: 51c25ecb67a2ad16fcee689d0e1dd491f1ccda8b

Vulnerability Details

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.

Publish Date: 2021-03-21

URL: CVE-2021-28957

CVSS 3 Score Details (6.1)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None

Suggested Fix

Type: Upgrade version

Origin: GHSA-jq4v-f5q6-mjqq

Release Date: 2021-03-21

Fix Resolution: 4.6.3