When the Elastic APM agent for Python versions before 5.1.0 is run as a CGI script, there is a variable name clash flaw if a remote attacker can control the proxy header. This could result in an attacker redirecting collected APM data to a proxy of their choosing.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-7617
Reference (s):
- https://discuss.elastic.co/t/elastic-apm-agent-for-python-5-1-0-security-update/196145
- https://www.elastic.co/community/security/