CVE-2019-20477 (Critical) detected in PyYAML-5.1.1.tar.gz

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CVE-2019-20477 - Critical Severity Vulnerability

Vulnerable Library - PyYAML-5.1.1.tar.gz

YAML parser and emitter for Python

Library home page: https://files.pythonhosted.org/packages/a3/65/837fefac7475963d1eccf4aa684c23b95aa6c1d033a2c5965ccb11e22623/PyYAML-5.1.1.tar.gz

Path to dependency file: /gubernator/test_requirements.txt

Path to vulnerable library: /gubernator/test_requirements.txt

Dependency Hierarchy:

• ❌ PyYAML-5.1.1.tar.gz (Vulnerable Library)

Found in HEAD commit: 382b29d19019bd87f2a1548fdf019dc9d51f5328

Found in base branch: improbable

Vulnerability Details

PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.

Publish Date: 2020-02-19

URL: CVE-2019-20477

CVSS 3 Score Details (9.8)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20477

Release Date: 2020-02-19

Fix Resolution: 5.2

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