SB2021090905 - Multiple vulnerabilities in WordPress
Published: September 9, 2021 Updated: September 29, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper access control (CVE-ID: N/A)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions to the REST API endpoint. A remote non-authenticated attacker can bypass implemented security restrictions and gain access to sensitive information.
2) Cross-site scripting (CVE-ID: N/A)
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 in the block editor. A remote attacker can trick the victim to follow a specially crafted link 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.
3) Command Injection (CVE-ID: CVE-2021-23337)
The vulnerability allows a remote user to execute arbitrary commands on the system.
The vulnerability exists due to improper input validation when processing templates. A remote privileged user can inject and execute arbitrary commands on the system.
4) Incorrect Regular Expression (CVE-ID: CVE-2020-28500)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient input validation when processing regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.
Remediation
Install update from vendor's website.