7.2

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2019-7617

CVE-2019-7617: Elastic APM agent for Python client CGI proxy redirection flaw

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.

(GitHub Advisory)

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CVE-2019-7617

CVE-2019-7617:

7.2

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
elastic-apm	pip	< 5.1.0	5.1.0

Technical Details

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Root Cause Analysis

The vulnerability stems from improper input validation (CWE-20) when handling proxy configuration in CGI environments. CGI scripts convert HTTP headers to environment variables (e.g., 'Proxy' header becomes HTTP_PROXY). The Elastic APM agent's transport layer likely used these environment variables directly to configure its proxy settings without validation. This allowed attackers to manipulate the proxy destination by injecting malicious headers. The function responsible for setting the proxy (e.g., set_proxy in the HTTP transport) would be vulnerable as it trusted environment variables without sanitizing them in CGI contexts. The fix in 5.1.0 likely added validation or avoided using untrusted environment variables in this context.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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