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WordPress UltimateMember 2.0 Cross Site Scripting

WordPress UltimateMember 2.0 Cross Site Scripting
Posted Feb 14, 2018
Authored by Aloyce J. Makalanga

WordPress UltimateMember plugin version 2.0 suffers from multiple cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
advisories | CVE-2018-6944, CVE-2018-6943
MD5 | ad31bc4c93b7bee1d023747d80c17ee9

WordPress UltimateMember 2.0 Cross Site Scripting

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1 of 2:

# Exploit Title: Stored Cross-Site Scripting (XSS) in UltimateMember Wordpress plugin 2.0
# CVE: CVE-2018-6943
# Date: 02-12-2018
# Software Link: https://ultimatemember.com <https://ultimatemember.com/>
# Exploit Author: Author: Aloyce J. Makalanga
# Contact: https://twitter.com/aloycemjr <https://twitter.com/aloycemjr>
# Vendor Homepage: https://ultimatemember.com <https://ultimatemember.com/>
# Category: webapps
# Impact: Remote Code Execution / Information Disclosure

1. Description
> UltimateMember plugin 2.0 for WordPress
> has a cross-site scripting vulnerability because it fails to properly sanitize user input passed to
> the $temp variable.
> An attacker can use this vulnerability to inject malicious JavaScript
> code into the UltimateMember Wordpress plugin, which will execute
> within the browser of any user who views the relevant Wordpress
> plugin.

2. Proof of Concept

28: $id = $_POST['key'];
50: $file = $id."-".$_FILES[$id]["name"];
51: $file = sanitize_file_name($file);
52: $ext = strtolower( pathinfo($file, PATHINFO_EXTENSION) );
28: $id = $_POST['key'];
50: $file = $id."-".$_FILES[$id]["name"];
51: $file = sanitize_file_name($file);
60: $file = "stream_photo_".md5($file)."_".uniqid().".".$ext;
49: $temp = $_FILES[$id]["tmp_name"]; <========== Vulnerable code
61: $ret[ ] = $ultimatemember->files->new_image_upload_temp( $temp, $file, um_get_option('image_compression') );
70: echo json_encode($ret);

3. Solution:

Vendor has issued an update.



2 of 2:


# Exploit Title: Stored Cross-Site Scripting (XSS) in UltimateMember Wordpress plugin 2.0
# CVE: CVE-2018-6944
# Date: 02-12-2018
# Software Link: https://ultimatemember.com <https://ultimatemember.com/>
# Exploit Author: Author: Aloyce J. Makalanga
# Contact: https://twitter.com/aloycemjr <https://twitter.com/aloycemjr>
# Vendor Homepage: https://ultimatemember.com <https://ultimatemember.com/>
# Category: webapps
# Impact: Remote Code Execution / Information Disclosure

1. Description
> UltimateMember plugin 2.0 for WordPress
> has a cross-site scripting vulnerability because it fails to properly sanitize user input passed to
> the $temp variable.
> An attacker can use this vulnerability to inject malicious JavaScript
> code into the UltimateMember Wordpress plugin, which will execute
> within the browser of any user who views the relevant Wordpress
> plugin.

2. Proof of Concept

30: $id = $_POST['key'];

53: $file = apply_filters('um_upload_file_name',$id."-".$_FILES[$id]["name"],$id,$_FILES[$id]["name"]);

54: $file = sanitize_file_name($file);

52: $temp = $_FILES[$id]["tmp_name"];<==========Vulnerable code

61: $ret[] = $ultimatemember->files->new_file_upload_temp( $temp, $file );

72: echo json_encode($ret);


3. Solution:

Vendor has issued an update.

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