CVE-2020-14343 (High) detected in PyYAML-5.3.1.tar.gz

[mend-bolt-for-github]

CVE-2020-14343 - High Severity Vulnerability

Vulnerable Library - PyYAML-5.3.1.tar.gz

YAML parser and emitter for Python

Library home page: https://files.pythonhosted.org/packages/64/c2/b80047c7ac2478f9501676c988a5411ed5572f35d1beff9cae07d321512c/PyYAML-5.3.1.tar.gz

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ PyYAML-5.3.1.tar.gz (Vulnerable Library)

Found in HEAD commit: d23199e10015c175819644e0d6a192d3c603c1ef

Found in base branch: master

Vulnerability Details

A vulnerability was discovered in the PyYAML library in versions before 5.4, 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. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

Publish Date: 2021-02-09

URL: CVE-2020-14343

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-2020-14343

Release Date: 2021-02-09

Fix Resolution: PyYAML - 5.4

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[TechnoConserve]

This project does not parse YAML from untrusted sources so it is not vulnerable to this particular CVE. That said, a new version of PyYAML is expected next week which will begin to address the issue so we'll update to that version here as well.