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CVE-2017-9785 — Deserialization of Untrusted Data in Nancy — CVE...

CRITICAL

Deserialization of Untrusted Data in NancyFX Nancy

Published May 17, 2022Updated November 8, 2023Source: osv

Summary

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.

Advisory Timeline

  • First published May 17, 2022 (1609 days ago).
  • Last revised November 8, 2023 — 540 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Nancy to 2.0.0 or later
dotnet add package Nancy --version 2.0.0
NuGet
Update Nancy to 1.4.4 or later
dotnet add package Nancy --version 1.4.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Nancy
nuget
2.0.0-alpha, 2.0.0-barneyrubble, 2.0.0-clienteastwood, 2.0.0-clinteastwood2.0.0
Nancy
nuget
0.10.0, 0.11.0, 0.12.0, 0.12.1 (+37 more)1.4.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2017-9785?
Deserialization of Untrusted Data in NancyFX Nancy This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2017-9785?
CVE-2017-9785 affects Nancy. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2017-9785 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-mx3q-j2g2-5qxq

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