SEI CERT Oracle Coding Standard for Java

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The APIs tabulated below perform tasks using the immediate caller's class loader.

APIs

java.lang.Class.forName

java.lang.Package.getPackage(s)

java.lang.Runtime.load

java.lang.Runtime.loadLibrary

java.lang.System.load

java.lang.System.loadLibrary

java.sql.DriverManager.getConnection

java.sql.DriverManager.getDriver(s)

java.sql.DriverManager.deregisterDriver

java.util.ResourceBundle.getBundle

Non-Compliant Code Example

The untrustedCode method invokes loadLibrary method in this non-compliant example. This is dangerous as the library gets loaded on behalf of the untrusted code. The acceptance of tainted inputs from the untrusted code further exacerbates the issue. In essence, untrusted code's class loader may be able to load the intended library even if it does not have sufficient permissions.

public static void untrustedCode() {
  loadLibrary("/com/foo/MyLib.so");
}  

public static void loadLibrary() {
  System.loadLibrary(lib);
}

Compliant Solution

Ensure that untrusted code cannot invoke the affected APIs directly or indirectly (that is, via a call to an invoking method). Do not operate on tainted inputs and make sure that internal objects are not returned to untrusted code. 

public static void loadLibrary() {
  System.loadLibrary("/com/foo/HardcodedLib.so");
}

References

Sun Secure Coding Guidelines

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