SB2021070701 - Multiple vulnerabilities in Joomla!

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Main Vulnerability Database SB2021070701

SB2021070701 - Multiple vulnerabilities in Joomla!

Published: July 7, 2021

Security Bulletin ID SB2021070701
Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 40% Low 60%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Cross-site scripting (CVE-ID: CVE-2021-26039)

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 com_media component. 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) Improper access control (CVE-ID: CVE-2021-26038)

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

The vulnerability exists due to improper access restrictions within the com_installer component. the iInstall action in com_installer lacks the required hardcoded ACL checks for superusers. A remote unprivileged user can compromise the affected installation of Joomla! under certain circumstances.


3) Insufficient Session Expiration (CVE-ID: CVE-2021-26037)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient session expiration issue when changing user's password or blocking the user accont. A remote non-authenticated attacker can obtain or guess session token and gain unauthorized access to session that belongs to another user.


4) Input validation error (CVE-ID: CVE-2021-26036)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user can pass specially crafted input to the application and damage usergroups table, leading to a denial of service condition.


5) Cross-site scripting (CVE-ID: CVE-2021-26035)

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 Rules field of the JForm API. 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.


Remediation

Install update from vendor's website.

References