SB2019121301 - Multiple vulnerabilities in WordPress

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Main Vulnerability Database SB2019121301

SB2019121301 - Multiple vulnerabilities in WordPress

Published: December 13, 2019 Updated: January 8, 2020

Security Bulletin ID SB2019121301
Severity
Low
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Stored cross-site scripting (CVE-ID: CVE-2019-16781)

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 within the block editor content. 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) Stored cross-site scripting (CVE-ID: CVE-2019-20042)

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 well-crafted links within the wp_targeted_link_rel() function in wp-includes/formatting.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.


3) Improper access control (CVE-ID: CVE-2019-20043)

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/rest-api/endpoints/class-wp-rest-posts-controller.php. A remote authenticated attacker can bypass implemented security restrictions and make a post sticky via the REST API.


4) Cross-site scripting (CVE-ID: CVE-2019-20041)

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 within the wp_kses_bad_protocol() function in wp-includes/kses.php when processing HTML5 colon named entity. 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.


5) Stored cross-site scripting (CVE-ID: CVE-2019-16780)

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 within the block editor content. 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.


Remediation

Install update from vendor's website.

References