GHSA-hm5p-x4rq-38w4

Описание

Summary

There may be an SSRF vulnerability in httparty. This issue can pose a risk of leaking API keys, and it can also allow third parties to issue requests to internal servers.

Details

When httparty receives a path argument that is an absolute URL, it ignores the base_uri field. As a result, if a malicious user can control the path value, the application may unintentionally communicate with a host that the programmer did not anticipate.

Consider the following example of a web application:

Now, suppose an attacker sends a request like this:

In this case, httparty sends the X-API-KEY not to http://example.test but instead to http://attacker.test.

A similar problem was reported and fixed in the HTTP client library axios in the past:
https://github.com/axios/axios/issues/6463

Also, Python's urljoin function has documented a warning about similar behavior:
https://docs.python.org/3.13/library/urllib.parse.html#urllib.parse.urljoin

PoC

Follow these steps to reproduce the issue:

1. Set up two simple HTTP servers.

   mkdir /tmp/server1 /tmp/server2 echo "this is server1" > /tmp/server1/index.html echo "this is server2" > /tmp/server2/index.html python -m http.server -d /tmp/server1 10001 & python -m http.server -d /tmp/server2 10002 &

2. Create a script (for example, main.rb):

   require 'httparty' class Client include HTTParty base_uri 'http://localhost:10001' end data = Client.get('http://localhost:10002').body puts data

3. Run the script:

   $ ruby main.rb this is server2

Although base_uri is set to http://localhost:10001/, httparty sends the request to http://localhost:10002/.

Impact

• Leakage of credentials: If an absolute URL is provided, any API keys or credentials configured in httparty may be exposed to unintended third-party hosts.
• SSRF (Server-Side Request Forgery): Attackers can force the httparty-based program to send requests to other internal hosts within the network where the program is running.
• Affected users: Any software that uses base_uri and does not properly validate the path parameter may be affected by this issue.