Unlimited SMS Verification Code sending vulnerability and repair in a substation in Zhongguancun

Is a vulnerability that can cause malicious SMS bombing because there is no limit on the number of messages sent on the SMS verification page.
Previously Zhongguancun second-hand are trading in the Forum, now Zhongguancun new a substation dedicated for second-hand trading, web site is http://2.zol.com.cn
On the page of a second-hand product, the phone number is followed by a "free text message consultation". open:
 
 
 
 
The actual address of the page:
 
 
 
 
Enter the number to confirm:
 
 
 
 
Use Burp to capture packets throughout the process:
 
 
 
 
After multiple POST packets, my mobile phone received many messages:
 

 
Solution:

Add the webpage verification code or limit the number of sent messages and set the interval of repeated sending