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Distributed Garbage Collector

  • Name: Distributed Garbage Collector

  • Class Names:

    • sun.rmi.transport.DGCImpl_Stub

  • Description:

    The Distributed Garbage Collector (DGC) tracks the number of active instances for remote objects and cleans them up if they are no longer used. Clients indicate usage of a remote object by calling the DGC.dirty method. The server returns a Lease that indicates how long it will keep the corresponding remote object from where. Within this lifetime, clients can call the DGC.dirty method again to renew the lease. When a remote object is garbage collected locally on the client side, a DGC.clean call is made that indicates that the corresponding remote object is no longer used by the client. In case of remote objects that are bound to the RMI registry, the registry itself is the Lease holder. Usually, DGC remote objects can be found on each RMI endpoint.

  • Remote Methods:

    java.rmi.dgc.Lease dirty(java.rmi.server.ObjID[] ids, long sequenceNum, java.rmi.dgc.Lease lease)
void clean(java.rmi.server.ObjID[] ids, long sequenceNum, java.rmi.dgc.VMID vmid, boolean strong)

  • References:

  • Known Vulnerabilities:

    • Deserialization

      • Description:

        Distributed Garbage Collector instances where JEP290 was not applied are vulnerable to deserialization attacks. With JEP290, deserialization filters were introduced. The deserialization filters of DGC endpoints are more restrictive than for the RMI registry and there a no known bypasses.

      • References:

JMX Connection

  • Name: JMX Connection

  • Class Names:

    • javax.management.remote.rmi.RMIConnectionImpl_Stub

  • Description:

    Java Management Extensions (JMX) can be used to monitor and manage a running Java virtual machine. This remote object can be used to send instructions to a running JMX agent. It is usually obtained by calling the newClient method on a JMX RMIServerImpl_Stub object.

  • Remote Methods:

    String getConnectionId() throws IOException;
void close() throws IOException;
ObjectInstance createMBean(String className, ObjectName name, Subject delegationSubject)
ObjectInstance createMBean(String className, ObjectName name, ObjectName loaderName, Subject delegationSubject)
ObjectInstance createMBean(String className, ObjectName name, MarshalledObject params, String signature[], Subject delegationSubject)
ObjectInstance createMBean(String className, ObjectName name, ObjectName loaderName, MarshalledObject params, String signature[], Subject delegationSubject)
void unregisterMBean(ObjectName name, Subject delegationSubject)
ObjectInstance getObjectInstance(ObjectName name, Subject delegationSubject)
Set<ObjectInstance> queryMBeans(ObjectName name, MarshalledObject query, Subject delegationSubject)
Set<ObjectName> queryNames(ObjectName name, MarshalledObject query, Subject delegationSubject)
boolean isRegistered(ObjectName name, Subject delegationSubject)
Integer getMBeanCount(Subject delegationSubject)
Object getAttribute(ObjectName name, String attribute, Subject delegationSubject)
AttributeList getAttributes(ObjectName name, String[] attributes, Subject delegationSubject)
void setAttribute(ObjectName name, MarshalledObject attribute, Subject delegationSubject)
AttributeList setAttributes(ObjectName name, MarshalledObject attributes, Subject delegationSubject)
Object invoke(ObjectName name, String operationName, MarshalledObject params, String signature[], Subject delegationSubject)
String getDefaultDomain(Subject delegationSubject)
String[] getDomains(Subject delegationSubject)
MBeanInfo getMBeanInfo(ObjectName name, Subject delegationSubject)
boolean isInstanceOf(ObjectName name, String className, Subject delegationSubject)
void addNotificationListener(ObjectName name, ObjectName listener, MarshalledObject filter, MarshalledObject handback, Subject delegationSubject)
void removeNotificationListener(ObjectName name, ObjectName listener, Subject delegationSubject)
void removeNotificationListener(ObjectName name, ObjectName listener, MarshalledObject filter, MarshalledObject handback, Subject delegationSubject)
Integer[] addNotificationListeners(ObjectName[] names, MarshalledObject[] filters, Subject[] delegationSubjects)
void removeNotificationListeners(ObjectName name, Integer[] listenerIDs, Subject delegationSubject)
NotificationResult fetchNotifications(long clientSequenceNumber, int maxNotifications, long timeout)

  • References:

  • Known Vulnerabilities:

    • MLet

      • Description:

        MLet is the name of an MBean that is usually available on JMX servers. It can be used to load other MBeans dynamically from user specified codebase locations (URLs). Access to the MLet MBean is therefore most of the time equivalent to remote code execution.

      • References:

    • Deserialization

      • Description:

        All communication to JMX that is dispatched over this remote object is not filtered for deserialization attacks. Therefore, each suitable method can be used to pass a deserialization payload to the server.

      • References:

JMX Server

  • Name: JMX Server

  • Class Names:

    • javax.management.remote.rmi.RMIServerImpl_Stub
    • javax.management.remote.rmi.RMIServer

  • Description:

    Java Management Extensions (JMX) can be used to monitor and manage a running Java virtual machine. This remote object is the entrypoint for initiating a JMX connection. Clients call the newClient method usually passing a HashMap that contains connection options (e.g. credentials). The return value (RMIConnection object) is another remote object that is when used to perform JMX related actions. JMX uses the randomly assigned ObjID of the RMIConnection object as a session id.

  • Remote Methods:

    String getVersion()
javax.management.remote.rmi.RMIConnection newClient(Object params)

  • References:

  • Known Vulnerabilities:

    • MLet

      • Description:

        MLet is the name of an MBean that is usually available on JMX servers. It can be used to load other MBeans dynamically from user specified codebase locations (URLs). Access to the MLet MBean is therefore most of the time equivalent to remote code execution.

      • References:

    • Deserialization

      • Description:

        Before CVE-2016-3427 got resolved, JMX accepted arbitrary objects during a call to the newClient method, resulting in insecure deserialization of untrusted objects. Despite being fixed, the actual JMX communication using the RMIConnection object is not filtered. Therefore, if you can establish a working JMX connection, you can also perform deserialization attacks.

      • References:

Quartz Scheduler

  • Name: Quartz Scheduler

  • Class Names:

    • org.quartz.core.QuartzScheduler
    • org.quartz.core.QuartzScheduler_Stub

  • Description:

    QuartzScheduler is an interface that can be used to control a Job scheduler. If this interface can be accessed without any restrictions, remote code execution is usually possible by scheduling an org.quartz.jobs.NativeJob.

  • Remote Methods:

    void addCalendar(String calName, org.quartz.Calendar calendar, boolean replace, boolean updateTriggers)
void addInternalJobListener(org.quartz.JobListener jobListener)
void addInternalSchedulerListener(org.quartz.SchedulerListener schedulerListener)
void addInternalTriggerListener(org.quartz.TriggerListener triggerListener)
void addJob(org.quartz.JobDetail jobDetail, boolean replace)
void addJob(org.quartz.JobDetail jobDetail, boolean replace, boolean storeNonDurableWhileAwaitingScheduling)
void addNoGCObject(Object obj)
boolean checkExists(org.quartz.JobKey jobKey)
boolean checkExists(org.quartz.TriggerKey triggerKey)
void clear()
boolean deleteCalendar(String calName)
boolean deleteJob(org.quartz.JobKey jobKey)
boolean deleteJobs(List<org.quartz.JobKey> jobKeys)
org.quartz.Calendar getCalendar(String calName)
List<String> getCalendarNames()
List<org.quartz.JobExecutionContext> getCurrentlyExecutingJobs()
org.quartz.JobListener getInternalJobListener(String name)
List<org.quartz.JobListener> getInternalJobListeners()
List<org.quartz.SchedulerListener> getInternalSchedulerListeners()
org.quartz.TriggerListener getInternalTriggerListener(String name)
List<org.quartz.TriggerListener> getInternalTriggerListeners()
org.quartz.JobDetail getJobDetail(org.quartz.JobKey jobKey)
org.quartz.spi.JobFactory getJobFactory()
List<String> getJobGroupNames()
Set<org.quartz.JobKey> getJobKeys(org.quartz.impl.matchers.GroupMatcher<org.quartz.JobKey> matcher)
Class<?> getJobStoreClass()
ListenerManager getListenerManager()
org.slf4j.Logger getLog()
Set<String> getPausedTriggerGroups()
SchedulerContext getSchedulerContext()
String getSchedulerInstanceId()
String getSchedulerName()
SchedulerSignaler getSchedulerSignaler()
ThreadGroup getSchedulerThreadGroup()
Class<?> getThreadPoolClass()
int getThreadPoolSize()
org.quartz.Trigger getTrigger(org.quartz.TriggerKey triggerKey)
List<String> getTriggerGroupNames()
Set<org.quartz.TriggerKey> getTriggerKeys(org.quartz.impl.matchers.GroupMatcher<org.quartz.TriggerKey> matcher)
List<? extends org.quartz.Trigger> getTriggersOfJob(org.quartz.JobKey jobKey)
org.quartz.Trigger.TriggerState getTriggerState(org.quartz.TriggerKey triggerKey)
String getVersion()
static String getVersionIteration()
static String getVersionMajor()
static String getVersionMinor()
void initialize()
boolean interrupt(org.quartz.JobKey jobKey)
boolean interrupt(String fireInstanceId)
boolean isClustered()
boolean isInStandbyMode()
boolean isShutdown()
boolean isShuttingDown()
boolean isSignalOnSchedulingChange()
boolean isStarted()
void notifyJobListenersToBeExecuted(org.quartz.JobExecutionContext jec)
void notifyJobListenersWasExecuted(org.quartz.JobExecutionContext jec, org.quartz.JobExecutionException je)
void notifyJobListenersWasVetoed(org.quartz.JobExecutionContext jec)
protected void notifyJobStoreJobComplete(org.quartz.spi.OperableTrigger trigger, org.quartz.JobDetail detail, org.quartz.org.quartz.Trigger.CompletedExecutionInstruction instCode)
protected void notifyJobStoreJobVetoed(org.quartz.spi.OperableTrigger trigger, org.quartz.JobDetail detail, org.quartz.org.quartz.Trigger.CompletedExecutionInstruction instCode)
void notifySchedulerListenersError(String msg, SchedulerException se)
void notifySchedulerListenersFinalized(org.quartz.Trigger trigger)
void notifySchedulerListenersInStandbyMode()
void notifySchedulerListenersJobAdded(org.quartz.JobDetail jobDetail)
void notifySchedulerListenersJobDeleted(org.quartz.JobKey jobKey)
void notifySchedulerListenersPausedJob(org.quartz.JobKey key)
void notifySchedulerListenersPausedJobs(String group)
void notifySchedulerListenersPausedTrigger(org.quartz.TriggerKey triggerKey)
void notifySchedulerListenersPausedTriggers(String group)
void notifySchedulerListenersResumedJob(org.quartz.JobKey key)
void notifySchedulerListenersResumedJobs(String group)
void notifySchedulerListenersResumedTrigger(org.quartz.TriggerKey key)
void notifySchedulerListenersResumedTriggers(String group)
void notifySchedulerListenersSchduled(org.quartz.Trigger trigger)
void notifySchedulerListenersShutdown()
void notifySchedulerListenersShuttingdown()
void notifySchedulerListenersStarted()
void notifySchedulerListenersStarting()
void notifySchedulerListenersUnscheduled(org.quartz.TriggerKey triggerKey)
protected void notifySchedulerThread(long candidateNewNextFireTime)
void notifyTriggerListenersComplete(org.quartz.JobExecutionContext jec, org.quartz.org.quartz.Trigger.CompletedExecutionInstruction instCode)
boolean notifyTriggerListenersFired(org.quartz.JobExecutionContext jec)
void notifyTriggerListenersMisfired(org.quartz.Trigger trigger)
int numJobsExecuted()
void pauseAll()
void pauseJob(org.quartz.JobKey jobKey)
void pauseJobs(org.quartz.impl.matchers.GroupMatcher<org.quartz.JobKey> groupMatcher)
void pauseTrigger(org.quartz.TriggerKey triggerKey)
void pauseTriggers(org.quartz.impl.matchers.GroupMatcher<org.quartz.TriggerKey> matcher)
boolean removeInternalJobListener(String name)
boolean removeInternalSchedulerListener(org.quartz.SchedulerListener schedulerListener)
boolean removeinternalTriggerListener(String name)
boolean removeNoGCObject(Object obj)
Date rescheduleJob(org.quartz.TriggerKey triggerKey, org.quartz.Trigger newTrigger)
void resumeAll()
void resumeJob(org.quartz.JobKey jobKey)
void resumeJobs(org.quartz.impl.matchers.GroupMatcher<org.quartz.JobKey> matcher)
void resumeTrigger(org.quartz.TriggerKey triggerKey)
void resumeTriggers(org.quartz.impl.matchers.GroupMatcher<org.quartz.TriggerKey> matcher)
Date runningSince()
void scheduleJob(org.quartz.JobDetail jobDetail, Set<? extends org.quartz.Trigger> triggersForJob, boolean replace)
Date scheduleJob(org.quartz.JobDetail jobDetail, org.quartz.Trigger trigger)
Date scheduleJob(org.quartz.Trigger trigger)
void scheduleJobs(Map<org.quartz.JobDetail,Set<? extends org.quartz.Trigger>> triggersAndJobs, boolean replace)
void setJobFactory(org.quartz.spi.JobFactory factory)
void setSignalOnSchedulingChange(boolean signalOnSchedulingChange)
void shutdown()
void shutdown(boolean waitForJobsToComplete)
void standby()
void start()
void startDelayed(int seconds)
boolean supportsPersistence()
void triggerJob(org.quartz.JobKey jobKey, org.quartz.JobDataMap data)
void triggerJob(org.quartz.spi.OperableTrigger trig)
boolean unscheduleJob(org.quartz.TriggerKey triggerKey)
boolean unscheduleJobs(List<org.quartz.TriggerKey> triggerKeys)
void validateState()

  • References:

  • Known Vulnerabilities:

RMI Activation Group

RMI Activation System

  • Name: RMI Activation System

  • Class Names:

    • sun.rmi.server.Activation$ActivationSystemImpl_Stub
    • java.rmi.activation.ActivationSystem

  • Description:

    The activation system is a legacy component of Java RMI. It allows remote objects to become inactive and allows clients to activate them when required. The ActivationSystemImpl remote object can be understood as a management interface for activation. It is only accessible from localhost and this restriction cannot be bypassed by the --localhost-bypass option. By accessing the ActivationSystemImpl, it is possible to register new activatable objects and activation groups. The activation system was deprecated and removed in 2021.

  • Remote Methods:

    java.rmi.activation.ActivationID registerObject(java.rmi.activation.ActivationDesc arg)
void unregisterObject(java.rmi.activation.ActivationID arg)
java.rmi.activation.ActivationGroupID registerGroup(java.rmi.activation.ActivationGroupDesc arg)
java.rmi.activation.ActivationMonitor activeGroup(java.rmi.activation.ActivationGroupID arg, java.rmi.activation.ActivationInstantiator arg, long arg)
void unregisterGroup(java.rmi.activation.ActivationGroupID arg)
void shutdown()
java.rmi.activation.ActivationDesc setActivationDesc(java.rmi.activation.ActivationID arg, java.rmi.activation.ActivationDesc arg)
java.rmi.activation.ActivationGroupDesc setActivationGroupDesc(java.rmi.activation.ActivationGroupID arg, java.rmi.activation.ActivationGroupDesc arg)
java.rmi.activation.ActivationDesc getActivationDesc(java.rmi.activation.ActivationID arg)
java.rmi.activation.ActivationGroupDesc getActivationGroupDesc(java.rmi.activation.ActivationGroupID arg)

  • References:

  • Known Vulnerabilities:

RMI Activator

RMI Registry

Spring RmiInvocationHandler