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Deserialization of Untrusted Data in NancyFX Nancy

Critical severity GitHub Reviewed Published May 17, 2022 to the GitHub Advisory Database • Updated Jan 27, 2023

Package

nuget Nancy (NuGet)

Affected versions

<= 1.4.3
>= 2.0.0-alpha, <= 2.0.0-clinteastwood

Patched versions

1.4.4
2.0.0

Description

Csrf.cs in NancyFX Nancy before 1.4.4 and 2.x before 2.0-dangermouse has Remote Code Execution via Deserialization of JSON data in a CSRF Cookie.

References

Published by the National Vulnerability Database Jul 20, 2017
Published to the GitHub Advisory Database May 17, 2022
Reviewed Jun 30, 2022
Last updated Jan 27, 2023

Severity

Critical

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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.687%
(81st percentile)

Weaknesses

CVE ID

CVE-2017-9785

GHSA ID

GHSA-mx3q-j2g2-5qxq

Source code

No known source code
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