CVE-2021-28957 (Medium) detected in lxml-4.5.0-cp27-cp27mu-manylinux1_x86_64.whl, lxml-3.3.5.tar.gz

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CVE-2021-28957 - Medium Severity Vulnerability

Vulnerable Libraries - lxml-4.5.0-cp27-cp27mu-manylinux1_x86_64.whl, lxml-3.3.5.tar.gz

lxml-4.5.0-cp27-cp27mu-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/03/06/eb9f000882f671a2d494342c1fe93b1c8b18fb04420bb611aeaa3298ef17/lxml-4.5.0-cp27-cp27mu-manylinux1_x86_64.whl

Path to dependency file: clusterfuzz/src/python/bot/tasks

Path to vulnerable library: clusterfuzz/src/python/bot/tasks,clusterfuzz/src/local/butler/scripts,clusterfuzz/src/requirements.txt,clusterfuzz/src/appengine/handlers/cron/project,clusterfuzz/src/python/bot/untrusted_runner/build,clusterfuzz/src/appengine/requirements.txt,clusterfuzz/resources/platform/linux/peach/peach_mutator/peach_mutator/requirements.txt,clusterfuzz/src/platform_requirements.txt

Dependency Hierarchy:

• ❌ lxml-4.5.0-cp27-cp27mu-manylinux1_x86_64.whl (Vulnerable Library)

lxml-3.3.5.tar.gz

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

Library home page: https://files.pythonhosted.org/packages/ae/a8/ad6c2350c65b357faf9a06c7428b5c6159b01bd3014eed93a75513843063/lxml-3.3.5.tar.gz

Path to dependency file: clusterfuzz/src/python/bot/untrusted_runner/build

Path to vulnerable library: clusterfuzz/src/python/bot/untrusted_runner/build,clusterfuzz/resources/platform/linux/peach/peach_mutator/peach_mutator/third_party/peach/requirements.txt,clusterfuzz/src/local/butler/scripts,clusterfuzz/src/python/bot/tasks,clusterfuzz/src/appengine/handlers/cron/project

Dependency Hierarchy:

• ❌ lxml-3.3.5.tar.gz (Vulnerable Library)

Vulnerability Details

lxml 4.6.2 allows XSS. It places the HTML action attribute into defs.link_attrs (in html/defs.py) for later use in input sanitization, but does not do the same for the HTML5 formaction attribute.

Publish Date: 2021-03-21

URL: CVE-2021-28957

CVSS 3 Score Details (6.5)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28957

Release Date: 2021-03-21

Fix Resolution: 4.6.2