Access Restriction Bypass Affecting org.apache.karaf.management:org.apache.karaf.management.server package, versions [,4.2.8)
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14 Jun 2020
14 Jun 2020
Colm O hEigeartaigh
How to fix?
org.apache.karaf.management:org.apache.karaf.management.server to version 4.2.8 or higher.
org.apache.karaf.management:org.apache.karaf.management.server is a package that bundles starts the Karaf embedded MBean server and RMI registry allowing users to use JMX to manage Karaf.
Affected versions of this package are vulnerable to Access Restriction Bypass. In Karaf, JMX authentication takes place using JAAS and authorization takes place using ACL files. By default, only an "admin" can actually invoke on an MBean. However there is a vulnerability there for someone who is not an admin, but has a "viewer" role. In the 'etc/jmx.acl.cfg', such as role can call get*. It's possible to authenticate as a viewer role + invokes on the MLet getMBeansFromURL method, which goes off to a remote server to fetch the desired MBean, which is then registered in Karaf. At this point the attack fails as "viewer" doesn't have the permission to invoke on the MBean. Still, it could act as a SSRF style attack and also it essentially allows a "viewer" role to pollute the MBean registry, which is a kind of privilege escalation.