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CVE-2020-7965

Good to know:

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Date: January 29, 2020

flaskparser.py in Webargs 5.x through 5.5.2 doesn't check that the Content-Type header is application/json when receiving JSON input. If the request body is valid JSON, it will accept it even if the content type is application/x-www-form-urlencoded. This allows for JSON POST requests to be made across domains, leading to CSRF.

Language: Python

Severity Score

Related Resources (9)

https://github.com/advisories/GHSA-fjq3-5pxw-4wj4
https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
https://webargs.readthedocs.io/en/latest/changelog.html#id11
https://webargs.readthedocs.io/en/latest/changelog.html
https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
https://nvd.nist.gov/vuln/detail/CVE-2020-7965
https://github.com/marshmallow-code/webargs
https://www.mend.io/vulnerability-database/CVE-2020-7965

Severity Score

Weakness Type (CWE)

Cross-Site Request Forgery (CSRF)

CWE-352

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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