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Restrict LDAP access via JNDI #608

Knowasiak
Knowasiak
12 December 2021
102
Restrict LDAP access via JNDI #608

@ceki @remkop – it is not exactly true that it doesn’t suffer from lookup issue though.

If you look at how jndi works in 1.x you will find that there are two places where lookups are done – that is JMSAppender.java:207 and JMSAppender.java:222 – if you set TopicBindingName or TopicConnectionFactoryBindingName to something that JNDI can handle – for example “ldap://host:port/a” JNDI will do exactly the same thing it does for 2.x – so 1.x is vulnerable, just attack vector is “safer” as it depends on configuration rather than user input

sun.jndi.ldap.LdapRequest.getReplyBer(LdapRequest.java:133)
at java.naming/com.sun.jndi.ldap.Connection.readReply(Connection.java:443)
at java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:365)
at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:192)
at java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2895)
at java.naming/com.sun.jndi.ldap.LdapCtx.(LdapCtx.java:348)
at java.naming/com.sun.jndi.url.ldap.ldapURLContextFactory.getUsingURLIgnoreRootDN(ldapURLContextFactory.java:60)
at java.naming/com.sun.jndi.url.ldap.ldapURLContext.getRootURLContext(ldapURLContext.java:61)
at java.naming/com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:204)
at java.naming/com.sun.jndi.url.ldap.ldapURLContext.lookup(ldapURLContext.java:94)
at java.naming/javax.naming.InitialContext.lookup(InitialContext.java:409)
**at org.apache.log4j.net.JMSAppender.lookup(JMSAppender.java:245)**
**at org.apache.log4j.net.JMSAppender.activateOptions(JMSAppender.java:207)**
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)
at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
at org.apache.log4j.LogManager.(LogManager.java:127)
at org.apache.log4j.Logger.getLogger(Logger.java:104)
at testexploit1.(testexploit1.java:10)
log4j: Parsed “jms” options.
log4j: Parsing for [org.apache.activemq] with value=[INFO, stdout].
log4j: Level token is [INFO].
log4j: Category org.apache.activemq set to INFO
log4j: Parsing appender named “stdout”.
log4j: Appender “stdout” was already parsed.
log4j: Handling log4j.additivity.org.apache.activemq=[null]
log4j: Finished configuring.
“> 
log4j: Trying to find [log4j.xml] using context classloader jdk.internal.loader.ClassLoaders$AppClassLoader@5cb0d902.
log4j: Trying to find [log4j.xml] using jdk.internal.loader.ClassLoaders$AppClassLoader@5cb0d902 class loader.
log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource().
log4j: Trying to find [log4j.properties] using context classloader jdk.internal.loader.ClassLoaders$AppClassLoader@5cb0d902.
log4j: Using URL [file:/home/user/Downloads/l4j/log4j.properties] for automatic log4j configuration.
log4j: Reading configuration from URL file:/home/user/Downloads/l4j/log4j.properties
log4j: Parsing for [root] with value=[DEBUG, stdout, jms].
log4j: Level token is [DEBUG].
log4j: Category root set to DEBUG
log4j: Parsing appender named "stdout".
log4j: Parsing layout options for "stdout".
log4j: Setting property [conversionPattern] to [%d %-5p %c - %m%n].
log4j: End of parsing for "stdout".
log4j: Parsed "stdout" options.
log4j: Parsing appender named "jms".
log4j: Setting property [initialContextFactoryName] to [org.apache.activemq.jndi.ActiveMQInitialContextFactory].
**log4j: Setting property [topicBindingName] to [ldap://server:1500/a].
log4j: Setting property [topicConnectionFactoryBindingName] to [ldap://server:1500/a].**
log4j: Setting property [providerURL] to [tcp://localhost:61616].
log4j: Getting initial context.
**log4j: Looking up [ldap://server:1500/a]**
log4j:ERROR Error while activating options for appender named [jms].
javax.naming.NamingException: LDAP connection has been closed
	at java.naming/com.sun.jndi.ldap.LdapRequest.getReplyBer(LdapRequest.java:133)
	at java.naming/com.sun.jndi.ldap.Connection.readReply(Connection.java:443)
	at java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:365)
	at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:192)
	at java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2895)
	at java.naming/com.sun.jndi.ldap.LdapCtx.(LdapCtx.java:348)
	at java.naming/com.sun.jndi.url.ldap.ldapURLContextFact
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