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GHSA-v8wj-f5c7-pvxf

MediumCVSS 4.9 / 10
Published May 27, 2025·Last modified May 29, 2025
Affected Components(0)

No affected components available

Description

Description

In Strapi latest version, at function Settings -> Webhooks, the application allows us to input a URL in order to create a Webook connection. However, we can input into this field the local domains such as localhost, 127.0.0.1, 0.0.0.0,.... in order to make the Application fetching into the internal itself, which causes the vulnerability Server - Side Request Forgery (SSRF).

Payloads

  • http://127.0.0.1:80 -> The Port is not open
  • http://127.0.0.1:1337 -> The Port which Strapi is running on

Steps to Reproduce

  • First of all, let's input the URL http://127.0.0.1:80 into the URL field, and click "Save".

CleanShot 2024-06-04 at 22 45 17@2x

  • Next, use the "Trigger" function and use Burp Suite to capture the request / response

CleanShot 2024-06-04 at 22 47 50@2x

  • The server return request to http://127.0.0.1/ failed, reason: connect ECONNREFUSED 127.0.0.1:80, BECAUSE the Port 80 is not open, since we are running Strapi on Port 1337, let's change the URL we input above into http://127.0.0.1:1337

CleanShot 2024-06-04 at 22 50 13@2x

  • Continue to click the "Trigger" function, use Burp to capture the request / response

CleanShot 2024-06-04 at 22 53 25@2x

  • The server returns Method Not Allowed, which means that there actually is a Port 1337 running the machine.

PoC

Here is the Poc Video, please check:

https://drive.google.com/file/d/1EvVp9lMpYnGLmUyr16gQ_2RetI-GqYjV/view?usp=sharing

Impact

  • If there is a real server running Strapi with many ports open, by using this SSRF vulnerability, the attacker can brute-force through all 65535 ports to know what ports are open.
Risk Scores
Base Score
4.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
4.5

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.48%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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