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How CVE-2025-4318 Works
The AWS Amplify Studio `amplify-codegen-ui` package is a JavaScript library that automatically generates front-end code from UI Builder entities—components, forms, views, and themes. It is used both within Amplify Studio for component previews and via the AWS CLI to generate component files in local applications.
The vulnerability resides in the expression-binding function responsible for converting component schema properties into executable JavaScript expressions. This function lacks input validation, meaning it does not sanitize or verify the properties of a component schema before processing them.
An authenticated attacker with permissions to create or modify components can exploit this by crafting a malicious component schema. When imported via the `create-component` command, the schema’s properties are passed unsanitized to the expression-binding function. The function then converts these tainted properties into executable JavaScript expressions without any validation.
This allows the attacker to inject arbitrary JavaScript code into the component’s properties. The injected code is executed during the component rendering and build process—when Amplify Studio previews the component or when the CLI generates code for a local application. Because the code runs in the context of the rendering or build pipeline, it can access sensitive resources, exfiltrate data, or compromise downstream applications.
The attack does not require any user interaction beyond the authenticated attacker having component creation/modification privileges. It is a classic code injection flaw caused by the failure to treat untrusted input as data rather than as executable code.
The vulnerability affects all versions of `amplify-codegen-ui` up to and including 2.20.2. It was partially addressed in version 2.20.3 with additional hardening in 2.20.4. The issue was discovered and reported by security researcher “ray the bounty hunter” through AWS’s coordinated disclosure process.
DailyCVE Form:
Platform: `amplify-codegen-ui` (npm)
Version: <=2.20.2
Vulnerability: Code Injection (CWE-94)
Severity: Critical (CVSS 9.5)
Date: 2025-05-05
Prediction: Already Patched (2025-05-05)
What Undercode Say:
Analytics from the Advisory & Security Research
The vulnerability stems from improper input validation in the expression-binding function. The function converts component schema properties to expressions without sanitization, allowing injection of arbitrary JavaScript.
Check installed version npm list @aws-amplify/amplify-codegen-ui Check AWS CLI version aws amplify --version
The issue was reported through coordinated disclosure by “ray the bounty hunter”. AWS confirmed no in-the-wild exploits were detected prior to patching. The CVSS v4 score is 9.5 (Critical).
Attackers need only authenticated access with permissions to create or modify components. No additional privileges are required.
Exploit:
An attacker with component creation/modification permissions can craft a malicious component schema. The schema contains unsanitized JavaScript in component properties:
{
"componentProperty": "{{恶意JavaScript代码}}"
}
When imported via create-component, the expression-binding function converts the property to an executable expression without validation. The injected code executes during component rendering or build processes, potentially compromising backend systems, exfiltrating data, or spreading to downstream applications via generated code.
Protection:
1. Upgrade immediately to version 2.20.4 or later:
npm update @aws-amplify/[email protected]
2. Audit existing components for unexpected or suspicious expression bindings.
3. Restrict permissions for component creation and modification to trusted users only.
4. Patch any forked or derivative code to incorporate fixes from versions 2.20.3 and 2.20.4.
5. Enable AWS CloudTrail to monitor API calls related to component modifications.
6. Scan imported schemas for untrusted code before processing.
Impact:
- Arbitrary Code Execution: Authenticated attackers can run malicious JavaScript during component rendering and build processes.
- Supply Chain Risk: Compromised components may propagate to downstream applications via AWS CLI code generation.
- Data Exfiltration: Attackers can inject keyloggers or credential harvesters disguised as legitimate UI elements.
- Service Disruption: Malicious scripts can disrupt rendering and build pipelines.
- Backend Compromise: Code executes in the context of the build pipeline, potentially accessing sensitive backend resources.
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Sources:
Reported By: github.com
Extra Source Hub:
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