SB2020072003 - Multiple vulnerabilities in Email Subscribers & Newsletters plugin for WordPress

Description

This security bulletin contains information about 2 vulnerabilities.

1) SQL injection (CVE-ID: CVE-2020-5768)

CWE-ID: CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear

The vulnerability allows a remote user to execute arbitrary SQL queries in database.

The vulnerability exists due to insufficient sanitization of user-supplied data in the "es_newsletters_settings_callback()" function in "class-es-newsletters.php". A remote administrator can send a specially crafted request and disclose potentially sensitive information such as value of database fields.

2) Cross-site request forgery (CVE-ID: CVE-2020-5767)

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin in the "send_test_email()" function in "class-es-mailer.php". A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

Remediation

Install update from vendor's website.

References

• https://www.tenable.com/security/research/tra-2020-44-0
• https://wpvulndb.com/vulnerabilities/10322/
• https://github.com/tenable/poc/blob/master/WordPress/plugins/Icegram/email_subscribers_and_newsletters/csrf_poc.html