pyyaml pyyaml CVE-2020-1747 vulnerability in Pyyaml and Other Products
Published on March 24, 2020

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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.

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Vulnerability Analysis

CVE-2020-1747 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.


Products Associated with CVE-2020-1747

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-1747 are published in these products:

Pyyaml
 
Fedora Project Fedora
 
OpenSuse Leap
 
Oracle Communications Cloud Native Core Network Function Cloud Native Environment
 

Affected Versions

Red Hat PyYAML Version 5.3.1 is affected by CVE-2020-1747

Exploit Probability

EPSS
3.07%
Percentile
86.57%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.