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Deserialization of Untrusted Data in parlai

High severity GitHub Reviewed Published Sep 10, 2021 in facebookresearch/ParlAI • Updated Feb 1, 2023

Package

pip parlai (pip)

Affected versions

< 1.1.0

Patched versions

1.1.0

Description

Impact

Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks.

Patches

The issue can be patched by upgrading to v1.1.0 or later. It can also be patched by replacing YAML deserialization with equivalent safe_load calls.

References

References

@jurajh-fb jurajh-fb published to facebookresearch/ParlAI Sep 10, 2021
Published by the National Vulnerability Database Sep 10, 2021
Reviewed Sep 13, 2021
Published to the GitHub Advisory Database Sep 13, 2021
Last updated Feb 1, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

EPSS score

0.192%
(57th percentile)

Weaknesses

CVE ID

CVE-2021-39207

GHSA ID

GHSA-m87f-9fvv-2mgg

Source code

Credits

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