Additionally, as a front-end language, attackers can easily identify and exploit activities in the front-end application. Malicious actors can manipulate query strings by modifying the code in their browsers or sending direct server-side requests that bypass the front-end protections.
JS Source Code Vulnerabilities
Unintended Script Execution
The Document Object Model (DOM) represents a web page’s structure, style, and content so that developers can manipulate the HTML source code. Attackers can modify the DOM in a victim’s browser, injecting malicious scripts as part of a DOM-based Cross-Site Scripting (XSS) attack.
Exclusive Reliance on Client-Side Validation
Client-side validation gives the user feedback about the inputs they provide, like when they fill out a form. However, when you program the web application’s validation only for the user’s browser, attackers can send data to servers, corrupting records and configurations.
Exposure of Session Data
Data transfers between the user’s browser and application server often include sensitive information, like user session ID. Malicious actors can access the communications between the browser and the application using client-side browser scripts.
Unintentional User Activity
By implementing secure code best practices, you can mitigate data breach risks and protect user data more effectively.
Use Trusted Third-Party Libraries and Plugins
When using open-source code, you should verify it to ensure it is a trusted resource. You should:
- Read file names carefully to reduce typosquatting risks
- Ensure the repository is maintained and updated regularly
- Monitor for and apply security patches and updates
Identify and Audit Dependencies
You need visibility into not only the third-party resources that you use, but the fourth-party dependencies embedded in them. Using a Software Composition Analysis (SCA) tool enables you to identify all dependencies within your source code.
Linters check your code for:
- Programmatic error
- Stylist errors
- Excess indentation levels
- Long functions
- Wrong use of equality
- Known vulnerabilities
Use Subresource Integrity (SRI)
When you sanitize the output, you prevent sensitive data from being sent to the client-side. You should ensure that you:
- Strip all sensitive information from client-side communications
- Send only the least amount of required information
- Ensure general error message contain no sensitive data
Validate Referrer Headers
Servers check referred headers to ensure that the requests come from expected resources. Your application should reject all requests that do not have expected values.
Qwiet AI’s preZero platform enables you to identify and remediate your application’s most critical and impactful vulnerabilities. Our proprietary Code Property Graph (CPG) breaks code down into its fundamental parts while correlating them with data flows so that you can identify the vulnerabilities attackers are most capable of exploiting within your source code’s context. With Qwiet Blacklight, the only threat intelligence feed focused on application security, you gain visibility into real-world attacks actively targeting vulnerabilities, enabling you to enhance your prioritization strategies.