CVE-2020-11998 — A regression has been introduced in the commit preventing JMX re-bind

A regression has been introduced in the commit preventing JMX re-bind. By passing an empty environment map to RMIConnectorServer, instead of the map that contains the authentication credentials, it leaves ActiveMQ open to the following attack: https://docs.oracle.com/javase/8/doc

01What is this vulnerability?

A regression has been introduced in the commit preventing JMX re-bind. By passing an empty environment map to RMIConnectorServer, instead of the map that contains the authentication credentials, it leaves ActiveMQ open to the following attack: https://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html "A remote client could create a javax.management.loading.MLet MBean and use it…

02Affected products

Vendor	Product	Versions
n	a / Apache ActiveMQ	Apache Tomcat 5.15.12

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-09-10T18:10:22.000Z
• Last modified: 2024-08-04T11:48:57.796Z

09References

• activemq.apache.org — http://activemq.apache.org/security-advisories.data/CVE-2020-11998-announcement.…
• www.oracle.com — https://www.oracle.com/security-alerts/cpujan2021.html
• lists.apache.org — https://lists.apache.org/thread.html/rb2fd3bf2dce042e0ab3f3c94c4767c96bb2e7e6737…
• lists.apache.org — https://lists.apache.org/thread.html/r946488fb942fd35c6a6e0359f52504a558ed438574…
• www.oracle.com — https://www.oracle.com/security-alerts/cpuApr2021.html
• www.oracle.com — https://www.oracle.com//security-alerts/cpujul2021.html
• www.oracle.com — https://www.oracle.com/security-alerts/cpuoct2021.html