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SQL Injection in SRS Simple Hits Counter Plugin for WordPress

Medium

Synopsis

Tenable has discovered a blind SQL injection vulnerability in the SRS Simple Hits Counter plugin for WordPress due to improper validation of user supplied input data. The root cause of the issue occurs in the srs_simple_hits_counter function which fails to validate the contents of the post_id variable. This variable value is used to form an SQL query in the update_views_visitors function.

An unauthenticated, remote attacker can exploit this issue via crafted requests to disclose potentially sensitive information from the WordPress database (e.g. admin password hash). We have verified this vulnerability is present when installed on Ubuntu Linux x64 and Windows x64.

For example:

In srs_simple_hits_counter, the post_id variable is set as such:

$post_id = $_GET['post_id'];

And then in update_views_visitors, a SQL query is constructed with this value:

$post_data = $wpdb->get_results("SELECT * FROM $table_name WHERE (srs_post_id = $post_id AND srs_date = '".$date."' )");

Proof of Concept

The PoC will attempt to exploit this issue to retrieve the admin password hash from the WordPress database by sending multiple specially crafted requests. The following is an example of how to use the PoC:

python3 blind_sqli_tra_2020_42.py http://192.168.1.195/wordpress

Solution

Upgrade to version 1.1.0

Disclosure Timeline

06/09/2020 - Tenable attempts to contact the developer directly. Email bounced back.
06/10/2020 - Reported vulnerability to Wordpress plugin team. 90-day date set to September 08, 2020.
06/11/2020 - Automated response from WordPress plugin team.
06/30/2020 - Tenable asks for an update.
07/01/2020 - WordPress plugin team replies with no update.
07/09/2020 - Tenable notices a fix in the plugin. Notifies WordPress that we will be releasing an advisory, and also that the fix is incomplete. Asks if WP will request CVE.
07/10/2020 - WordPress will not request CVE. Says we can.

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

CVE ID: CVE-2020-5766
Tenable Advisory ID
TRA-2020-42
Credit

Alex Peña

CVSSv2 Base / Temporal Score
5.0
CVSSv2 Vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Affected Products
1.0.3, 1.0.4
Risk Factor
Medium

Advisory Timeline

07/10/2020 - Advisory published.
07/21/2020 - Updated solution.
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