SB2020103007 - Multiple vulnerabilities in WordPress
Published: October 30, 2020 Updated: November 18, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 9 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2020-28034)
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 global variables. 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.
2) Security restrictions bypass (CVE-ID: CVE-2020-28035)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions on XML-RPC requests. A remote authenticated attacker can escalate privileges within the application by sending a specially crafted XML-RPC request.
3) Resource management error (CVE-ID: CVE-2020-28037)
The vulnerability allows a remote attacker to compromise the affected website.
The vulnerability exists due to is_blog_installed in wp-includes/functions.php does not properly determine whether WordPress is already installed. This might allow an attacker to perform a new installation, leading to remote code execution (as well as a denial of service for the old installation).
4) Stored cross-site scripting (CVE-ID: CVE-2020-28038)
The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data, related to post slugs. A remote user can permanently store 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.
5) Improper access control (CVE-ID: CVE-2020-28039)
The vulnerability allows a remote attacker to gain unauthorized access to delete arbitrary files.
The vulnerability exists due to improper access restrictions in is_protected_meta in wp-includes/meta.php. A remote attacker can bypass implemented security restrictions and delete arbitrary files.
6) Cross-site request forgery (CVE-ID: CVE-2020-28040)
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. 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, such as change a theme's background image.
7) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-28033)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application mishandles embeds from disabled sites on a multisite network. A remote attacker can send out spam.
8) Deserialization of Untrusted Data (CVE-ID: CVE-2020-28032)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in wp-includes/Requests/Utility/FilteredIterator.php. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
9) Improper access control (CVE-ID: CVE-2020-28036)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in wp-includes/class-wp-xmlrpc-server.php. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the application by using XML-RPC to comment on a post.
Remediation
Install update from vendor's website.