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Arbitrary Code Execution Affecting pyyaml package, versions [5.1b1,5.3.1)

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.57% (78th percentile)
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NVD
9.8 critical
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SUSE
8.8 high
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Red Hat
9.8 critical

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  • Snyk ID SNYK-PYTHON-PYYAML-559098
  • published 2 Mar 2020
  • disclosed 2 Mar 2020
  • credit Riccardo Schirone (Red Hat)
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Introduced: 2 Mar 2020

CVE-2020-1747 Open this link in a new tab
CWE-20 Open this link in a new tab

How to fix?

Upgrade PyYAML to version 5.3.1 or higher.

Overview

Affected versions of this package are vulnerable to Arbitrary Code Execution. 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.