CVE-2020-11980 Information

Description

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. The vulnerability is low as it’s possible to add a ACL to limit access. Users should update to Apache Karaf 4.2.9 or newer.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://karaf.apache.org/security/cve-2020-11980.txt

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8