CVE-2020-1747 (Critical) detected in PyYAML-5.1.1.tar.gz

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CVE-2020-1747 - 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

A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.

Publish Date: 2020-03-24

URL: CVE-2020-1747

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: GHSA-6757-jp84-gxfx

Release Date: 2020-03-24

Fix Resolution: pyyaml - 5.3.1

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