Secure Java Coding Practices

Quick Snapshot on Threats, Vulnerabilities, Attack and Defense.

This blog focuses on Secure Java Coding standards for the following Vulnerabilities.

Unvalidated Inputs
Cross-Site Scripting (XSS)
SQL Inject flows
Improper Error Handling

Unvalidated Inputs

Attacker can change any value of the input submitted to the Web Server

Re-validate all the inputs at the server

Take only the necessary information (user input) from a for submission

Cross Site Scripting (XSS)

Attacker

Injects code into the input data

Hide malicious code with Unicode

Counter measures

Input validations

Input length check

SQL Injection

Attacker

Can inject System commands

Can inject other SQL

Can override access checks

Examples

Add more commands “; select * from users;”

Override access “’ OR 1=1;”

Counter Measures
Use prepared statements in SQL
Run with limited privileges
Filter / validate the input

Improper Error Handling

Attacker
Gets system information
Gets Database information

Examples
Stack (Thread) Traces
Database dump

Counter Measures
Sanitize the error message
Avoid sending stack traces to end user.
Customize error pages (HTTP errors 404 etc)

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