SB2020031310 - Multiple vulnerabilities in Popup Builder – Responsive WordPress Pop up – Subscription & Newsletter plugin

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Stored cross-site scripting (CVE-ID: CVE-2020-10196)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via the "allPopupData" parameter in "wp-admin/admin-ajax.php". A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Improper access control (CVE-ID: CVE-2020-10195)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in several actions. A remote authenticated attacker can send a specially crafted HTTP POST request and export a list of all newsletter subscribers, export system configuration information and grant themselves access to various features of the plugin.

The vulnerable actions included:

• add_action('admin_post_csv_file', array($this, 'getSubscribersCsvFile'));

• add_action('admin_post_sgpb_system_info', array($this, 'getSystemInfoFile'));

• add_action('admin_post_sgpbSaveSettings', array($this, 'saveSettings'), 10, 1);
  

Remediation

Install update from vendor's website.

References

• https://wpvulndb.com/vulnerabilities/10127/
• https://www.wordfence.com/blog/2020/03/vulnerabilities-patched-in-popup-builder-plugin-affecting-over-100000-sites/
• https://www.wordfence.com/blog/2020/03/vulnerabilities-patched-in-popup-builder-plugin-affecting-ove...