CVE-2025-31161 PoC — CrushFTP 安全漏洞

Source

https://github.com/f4dee-backup/CVE-2025-31161

Associated Vulnerability

Title:CrushFTP 安全漏洞 (CVE-2025-31161)
Description:CrushFTP 10 before 10.8.4 and 11 before 11.3.1 allows authentication bypass and takeover of the crushadmin account (unless a DMZ proxy instance is used), as exploited in the wild in March and April 2025, aka "Unauthenticated HTTP(S) port access." A race condition exists in the AWS4-HMAC (compatible with S3) authorization method of the HTTP component of the FTP server. The server first verifies the existence of the user by performing a call to login_user_pass() with no password requirement. This will authenticate the session through the HMAC verification process and up until the server checks for user verification once more. The vulnerability can be further stabilized, eliminating the need for successfully triggering a race condition, by sending a mangled AWS4-HMAC header. By providing only the username and a following slash (/), the server will successfully find a username, which triggers the successful anypass authentication process, but the server will fail to find the expected SignedHeaders entry, resulting in an index-out-of-bounds error that stops the code from reaching the session cleanup. Together, these issues make it trivial to authenticate as any known or guessable user (e.g., crushadmin), and can lead to a full compromise of the system by obtaining an administrative account.

Description

PoC CVE-2025-31161 - Authentication Bypass CrushFTP

Readme

# CVE-2025-31161 - CrushFTP Authentication Bypass Exploit
> PoC CVE-2025-31161 - Authentication Bypass CrushFTP

---

## 📌 CVE Details

- **ID**: CVE-2025-31161  
- **Type**: Authentication Bypass  
- **Vendor**: CrushFTP  
- **Impact**: Allows unauthenticated attackers to forge a valid `CrushAuth` token and create a fully privileged admin user.
- **More Info**: [NVD Entry (when available)](https://nvd.nist.gov/vuln/detail/CVE-2025-31161)

---

## ⚙️ Description

This exploit targets a critical vulnerability in **CrushFTP**, allowing remote unauthenticated attackers to **bypass authentication** and **create arbitrary admin users**.

It works by crafting a valid-looking `CrushAuth` token and abusing the `/WebInterface/function/` endpoint to submit a fully-formed XML payload.

---

## 🚀 Usage

### 🔧 Requirements

- `curl`
- `shuf`

### Instalation

```bash
git clone https://github.com/f4dee-backup/CVE-2025-31161
```
```bash
cd CVE-2025-31161
```
```bash
chmod +x CVE-2025-31161.sh
```
### Help Panel:
```
./CVE-2025-31161.sh --help

[?] Parameters description:

	--url            Target base URL (e.g., http://target)
	--port           Port where CrushFTP is running
	--target-user    Valid or invalid username (e.g., crushadmin)
	--new-user       Username to be created (e.g., Pwn3d)
	--new-password   Password for the new user
	--help           Show this help panel

[i] Example: bash ./cve_official.sh --url http://target.com --port 80 --target-user crushadmin --new-user evilUser --new-password pass12345
```

File Snapshot


 [4.0K]  /data/pocs/28d6aae82e7dadd9b3698506b086317d30e9f506
├── [6.7K]  CVE-2025-31161.sh
├── [1.0K]  LICENSE
├── [1.5K]  README.md
└── [  30]  requirements.txt

0 directories, 4 files

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