Description
An authorized user could upload a template which contained malicious code and accessed sensitive files via an XML External Entity (XXE) attack. The fix to properly handle XML External Entities was applied on the Apache NiFi 1.4.0 release. Users running a prior 1.x release should upgrade to the appropriate release.
Remediation
References
https://nifi.apache.org/security.html#CVE-2017-12623
Related Vulnerabilities
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CVE-2019-17566 Vulnerability in maven package org.apache.xmlgraphics:batik-svgrasterizer
CVE-2015-3337 Vulnerability in maven package org.elasticsearch:elasticsearch
CVE-2018-17145 Vulnerability in npm package bcoin
CVE-2019-1003061 Vulnerability in maven package org.jenkins-ci.plugins:jenkins-cloudformation-plugin