CVE-2021-31897 in WebStorm
Summary
by MITRE • 05/11/2021
In JetBrains WebStorm before 2021.1, code execution without user confirmation was possible for untrusted projects.
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Analysis
by VulDB Data Team • 05/15/2021
This vulnerability exists in JetBrains WebStorm prior to version 2021.1 where the IDE fails to properly validate project trust levels during code execution operations. The flaw allows malicious actors to execute arbitrary code within the context of the IDE without requiring explicit user confirmation when working with untrusted projects. This represents a critical security oversight in the application's privilege management and code execution controls. The vulnerability specifically affects the IDE's handling of project dependencies and external code integration mechanisms that do not adequately distinguish between trusted and untrusted project contexts. Attackers can exploit this by crafting malicious project files or dependencies that trigger unintended code execution when the IDE processes them. The lack of user confirmation requirements means that automated or semi-automated attacks can succeed without any interaction from the end user, making this particularly dangerous in environments where developers frequently work with external or third-party code. This vulnerability aligns with CWE-470 Untrusted Data in Variable, which addresses the improper handling of external inputs and the potential for code injection through unverified data sources. The security implications extend beyond simple code execution to include potential privilege escalation and information disclosure scenarios, as the executed code operates within the permissions of the IDE process. This weakness can be categorized under ATT&CK technique T1059.001 Command and Scripting Interpreter for executing commands through scripting languages.
The operational impact of this vulnerability is significant as it undermines the fundamental security model of modern IDEs that rely on user consent for potentially dangerous operations. When developers open untrusted projects, the IDE should enforce strict security boundaries to prevent malicious code from executing automatically. However, this flaw allows attackers to bypass these protective measures, potentially enabling them to install backdoors, exfiltrate data, or perform other malicious activities through the IDE's code execution pathways. The vulnerability is particularly concerning because it affects the development environment itself, which is typically considered a trusted space where developers work with sensitive code and information. The issue becomes more severe when considering that many developers use IDEs to work with code from multiple sources including open source repositories, third-party libraries, and collaborative platforms where untrusted code may be present. The lack of user confirmation creates a scenario where automated attacks can succeed silently, making detection and prevention particularly challenging for security teams monitoring development environments.
Mitigation strategies for this vulnerability should focus on immediate software updates to version 2021.1 or later where the trust validation mechanisms have been properly implemented. Organizations should also implement strict project validation policies and educate developers about the risks of opening untrusted projects without proper verification. Security configurations should be adjusted to require explicit user confirmation before executing any code from external sources, and automated dependency management systems should be configured to flag suspicious project elements. The implementation of sandboxing techniques for untrusted project processing and enhanced logging of code execution activities can help detect potential exploitation attempts. Additionally, regular security assessments of development environments should include checks for similar trust boundary violations, and organizations should consider implementing application whitelisting policies that restrict which code can execute within the IDE environment. These measures align with security best practices outlined in the OWASP Application Security Verification Standard and provide defense-in-depth approaches to protecting development workspaces from malicious code execution attacks.