Exploit for Code Injection in Foxcms CVE-2025-29306

## https://sploitus.com/exploit?id=AA7CDAAE-DFA6-5B2C-BF11-981BC7FB2F80
# 🌐 CVE-2025-29306  **Critical Remote Code Execution (RCE) in FoxCMS ≤ 1.2.5** 🌐



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## 🔥 Quick Highlights

* **Severity:** ★★★★★ (CVSS 9.8 — Critical)
* **Type:** Remote Code Execution (via PHP Object Injection)
* **Affected product:** **FoxCMS v1.2.5 and older**
* **Attack prerequisites:**

  * No authentication needed
  * No user interaction
  * Low complexity
* **Impact:** Full system compromise possible

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## 🧭 What’s Going On?

CVE-2025-29306 is caused by **unsafely handling user input** via PHP’s `unserialize()` function.
Attackers can pass malicious serialized objects to the **`id`** parameter of the FoxCMS case-display page.

When unserialized, these objects can **execute arbitrary PHP code**, often escalating to full OS command execution.

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## 🧩 Technical Breakdown

### **CWE Link**

* **CWE-94:** Improper Control of Code Generation
* Root cause: **Untrusted unserialize() usage**

### **Vector**

`AV:N / AC:L / PR:N / UI:N / S:U / C:H / I:H / A:H`

### **Why It's Dangerous**

* Works **remotely**
* Works with **no login**
* Easy to automate
* Leads to **webshell**, **data theft**, **service takeover**, **persistence**

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## 🛠️ Attack Overview

### **Vulnerable Endpoint (common):**

```
/images/index.html?id=
```

### **Malicious Input Example**

*(conceptual only — no exploit code)*
A crafted serialized object triggers a PHP method that invokes system-level commands.

### **Observed Public Exploits**

* Public PoCs exist on GitHub
* Automated scanning tools already integrate detection
* Mass-scanning on IPv4 reported by threat analysts

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## 🚨 Risk Level

### **Who is at risk?**

* Anyone hosting FoxCMS 1.2.5 or older
* Especially internet-facing deployments
* Shared hosting / unmanaged hosting environments

### **Potential Consequences**

* Server takeover
* Database exfiltration
* Malware deployment
* Defacement
* Lateral movement within the network

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## 🛡️ Mitigation & Defense

### ✔️ **Immediate Actions**

* Restrict access to vulnerable endpoints
* Enable Web Application Firewall (WAF) rules blocking unserialize-style payloads
* Disable dangerous PHP functions if not needed:

  * `system()`
  * `exec()`
  * `shell_exec()`
  * `popen()`

### ✔️ **Code-level Fix**

Replace:

```php
unserialize($_GET['id'])
```

With **safer formats** such as `json_decode()` and strict input validation.

### ✔️ **Server-level Hardening**

* Turn off `allow_url_include`
* Use PHP `open_basedir` restrictions
* Block user-controlled eval-like behavior

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## 📊 Visual Risk Rating

| Category           | Rating                        |
| ------------------ | ----------------------------- |
| Exploitability     | ⭐⭐⭐⭐⭐ (very easy)             |
| Impact             | ⭐⭐⭐⭐⭐ (system-level)          |
| Detection          | ⭐⭐☆☆☆ (often missed)          |
| Patch availability | ⭐☆☆☆☆ (no official patch yet) |
| Exposure           | ⭐⭐⭐⭐☆ (common CMS)            |

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**⚠️ Disclaimer:**
This information is for **educational and defensive security** purposes only. **🚫** Do not use it for unauthorized or illegal activities. **✔️** You are responsible for complying with all laws and permissions.