| 제목 | itsourcecode Payroll System 1.0 Unrestricted Upload |
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| 설명 | Description:
The `save_settings()` function handles file uploads with zero validation. No extension allowlist, no MIME type verification, no content inspection. Uploaded files retain their original filename and extension, and are stored in the web-accessible `assets/img/` directory. Combined with missing authentication (VULN-01), an unauthenticated attacker can upload and execute arbitrary PHP code.
Vulnerable Code:
**File**: `admin_class.php`, Lines 100-129
```php
function save_settings(){
extract($_POST);
$data = " name = '".str_replace("'","’",$name)."' ";
$data .= ", email = '$email' ";
$data .= ", contact = '$contact' ";
$data .= ", about_content = '".htmlentities(str_replace("'","’",$about))."' ";
if($_FILES['img']['tmp_name'] != ''){
$fname = strtotime(date('y-m-d H:i')).'_'.$_FILES['img']['name'];
$move = move_uploaded_file($_FILES['img']['tmp_name'],'assets/img/'. $fname);
$data .= ", cover_img = '$fname' ";
}
// ...
}
```
- No extension allowlist
- No MIME type validation (`getimagesize()`, `finfo`)
- No file content inspection
- Original filename and extension preserved (`$_FILES['img']['name']`)
- Files stored in web-accessible `assets/img/`
Proof of Concept:
**Upload PHP webshell**:
```http
POST /ajax.php?action=save_settings HTTP/1.1
Host: localhost:8093
Content-Type: multipart/form-data; boundary=----Boundary
Impact:
- Remote Code Execution on the web server
- Complete server compromise
- Data exfiltration, malware deployment, lateral movement
- Zero authentication required — fully unauthenticated RCE
Reference: https://github.com/microwaveabi/vul/issues/12 |
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| 원천 | ⚠️ https://github.com/microwaveabi/vul/issues/12 |
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| 사용자 | microwave (UID 96185) |
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| 제출 | 2026. 07. 11. AM 05:17 (2 개월 ago) |
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| 모더레이션 | 2026. 08. 24. AM 12:50 (1 month later) |
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| 상태 | 수락 |
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| VulDB 항목 | 394579 [itsourcecode Payroll System 1.0 admin_class.php save_settings img 권한 상승] |
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| 포인트들 | 20 |
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