CVE-2023-32571 in System.Linq.Dynamic.Core
Summary
by MITRE • 06/22/2023
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.
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Analysis
by VulDB Data Team • 07/17/2023
The vulnerability identified as CVE-2023-32571 affects the Dynamic LINQ library version 1.0.7.10 through 1.2.25 before 1.3.0, representing a critical security flaw that enables remote code execution through improper input validation. This issue manifests when untrusted data is processed through methods such as Where, Select, and OrderBy, which are fundamental components of the library's query building capabilities. The flaw stems from insufficient sanitization of user-supplied input that is subsequently interpreted as part of LINQ expressions, creating a pathway for malicious actors to inject arbitrary code that executes within the context of the application.
The technical implementation of this vulnerability leverages the dynamic nature of the LINQ library's expression parsing mechanism, where user input is directly incorporated into executable code structures without adequate validation or sanitization. When developers utilize methods like Where, Select, or OrderBy with untrusted data sources, the library's parser treats the input as executable instructions rather than mere data, effectively allowing attackers to construct malicious expressions that bypass normal security boundaries. This represents a classic command injection vulnerability that operates at the expression level rather than traditional input validation contexts, making it particularly insidious due to its integration with core data processing functions.
The operational impact of CVE-2023-32571 extends beyond simple code execution to encompass complete system compromise potential, as attackers can leverage this vulnerability to gain unauthorized access to sensitive data, escalate privileges, or perform destructive operations within the affected application's environment. The vulnerability affects any system utilizing Dynamic LINQ library versions within the specified range, particularly those that process user input through dynamic query building mechanisms. Organizations deploying applications that incorporate these library versions face significant risk exposure, as the vulnerability can be exploited remotely without requiring authentication or specialized access privileges, making it particularly dangerous in web-facing applications and APIs.
Security practitioners should prioritize immediate remediation through updating to Dynamic LINQ library version 1.3.0 or later, which contains the necessary patches to address the input validation deficiencies. Additional mitigations include implementing strict input validation at all application boundaries, employing proper parameterization techniques, and utilizing web application firewalls to detect and block suspicious query patterns. Organizations should also conduct comprehensive code reviews to identify all instances where Dynamic LINQ methods are used with untrusted input, ensuring proper sanitization measures are implemented. The vulnerability aligns with CWE-94, which addresses "Improper Control of Generation of Code," and maps to ATT&CK technique T1059.001 for command and scripting interpreter execution, emphasizing the critical need for immediate remediation and comprehensive security assessment across affected systems.