CVE-2025-4318 Overview
CVE-2025-4318 is a critical code injection vulnerability affecting the aws-amplify/amplify-codegen-ui package used in AWS Amplify Studio. The vulnerability stems from insufficient input validation in UI component property expressions, which could allow an authenticated user with access to create or modify components to execute arbitrary JavaScript code during the component rendering and build process.
Critical Impact
An authenticated attacker can execute arbitrary JavaScript code during component rendering and build processes, potentially compromising the development environment and resulting applications.
Affected Products
- AWS Amplify Studio
- aws-amplify/amplify-codegen-ui package (versions prior to v2.20.3)
Discovery Timeline
- 2025-05-05 - CVE-2025-4318 published to NVD
- 2025-10-14 - Last updated in NVD database
Technical Details for CVE-2025-4318
Vulnerability Analysis
This vulnerability is classified as CWE-95 (Improper Neutralization of Directives in Dynamically Evaluated Code), commonly known as code injection or eval injection. The aws-amplify/amplify-codegen-ui package processes UI component property expressions without adequate input validation or sanitization. When a user creates or modifies components within AWS Amplify Studio, the property expressions are evaluated dynamically during the component rendering and build phases.
The lack of proper input validation allows malicious JavaScript code to be embedded within component property expressions. When these expressions are processed during the build or rendering pipeline, the injected code is executed with the privileges of the build process. This creates a significant attack surface where authenticated users with component creation or modification permissions can compromise the integrity of the build environment.
Root Cause
The root cause of CVE-2025-4318 is the absence of input validation and sanitization mechanisms for UI component property expressions within the amplify-codegen-ui package. The code generation process dynamically evaluates user-controlled input without first verifying that the input conforms to expected, safe patterns. This design flaw enables code injection attacks where arbitrary JavaScript can be executed during the code generation and rendering phases.
Attack Vector
The attack vector for this vulnerability is network-based, requiring authentication. An attacker must have valid credentials and permissions to create or modify UI components within AWS Amplify Studio. Once authenticated, the attacker can craft malicious component property expressions containing JavaScript payloads. When Amplify Studio processes these components during rendering or builds the application, the injected code executes.
The attack flow involves:
- Authenticating to AWS Amplify Studio with appropriate permissions
- Creating or modifying a UI component with malicious property expressions
- Triggering component rendering or application build process
- Malicious JavaScript executes within the build/rendering context
For detailed technical analysis of the exploitation mechanism, refer to the SecureLayer7 Blog Analysis and the GitHub Security Advisory GHSA-hf3j-86p7-mfw8.
Detection Methods for CVE-2025-4318
Indicators of Compromise
- Unusual or obfuscated JavaScript code within component property expressions
- Unexpected network connections or process spawning during build processes
- Modifications to UI components by users who don't typically perform such actions
- Anomalous build artifacts or unexpected files generated during the build process
Detection Strategies
- Audit logs for component creation and modification activities in AWS Amplify Studio
- Monitor build process outputs for unexpected JavaScript execution or errors
- Implement code review processes for UI component definitions before deployment
- Use static analysis tools to scan component property expressions for suspicious patterns
Monitoring Recommendations
- Enable detailed logging for AWS Amplify Studio component operations
- Configure alerts for component modifications by non-standard accounts or at unusual times
- Monitor build process resource utilization for anomalies that might indicate code execution
- Implement integrity checks on build outputs to detect unauthorized modifications
How to Mitigate CVE-2025-4318
Immediate Actions Required
- Upgrade the aws-amplify/amplify-codegen-ui package to version 2.20.3 or later immediately
- Review AWS Amplify Studio access controls and limit component creation/modification permissions to trusted users
- Audit existing UI components for potentially malicious property expressions
- Review build logs for any indicators of compromise prior to patching
Patch Information
AWS has released a security patch addressing this vulnerability in version 2.20.3 of the amplify-codegen-ui package. The fix implements proper input validation for UI component property expressions to prevent arbitrary code injection.
Detailed patch information is available at:
Workarounds
- Restrict access to AWS Amplify Studio component creation and modification features to only trusted developers
- Implement additional code review gates for any component changes before they enter the build pipeline
- Consider isolating build processes in sandboxed environments to limit the impact of potential code execution
- Monitor and audit all component modifications until the patch can be applied
# Upgrade aws-amplify/amplify-codegen-ui to patched version
npm update @aws-amplify/codegen-ui@2.20.3
# Verify installed version
npm list @aws-amplify/codegen-ui
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
