9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-32571

CVE-2023-32571: Dynamic Linq vulnerable to remote code execution

Dynamic Linq 1.0.7.10 through 1.2.25 before 1.3.0 allows attackers to execute arbitrary code and commands when untrusted input to methods including Where, Select, OrderBy is parsed.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-32571

CVE-2023-32571:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
System.Linq.Dynamic.Core	nuget	>= 1.0.7.10, < 1.3.0	1.3.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from Dynamic LINQ's expression parser allowing method invocation on arbitrary types when processing untrusted input. The named methods (Where/Select/OrderBy) accept string parameters that get parsed into expression trees without proper security restrictions. Attackers can craft inputs that leverage C#-like syntax to invoke dangerous static methods (System.IO.File.WriteAllText). The CWE-697 (Incorrect Comparison) manifests as improper validation of allowed types/methods during expression parsing. The 1.3.0 patch introduced type allowlisting via [DynamicLinqType] attributes and security restrictions, confirming these methods were the attack surface.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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