The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4, when registration has been disabled, allows remote attackers to create user accounts by leveraging failure to check the Allow User Registration configuration setting.

According to its self-reported version number, the detected Joomla! application is affected by multiple vulnerabilities :

 - A privilege escalation vulnerability exists in the Joomla! core user registration component due to improper processing of unfiltered data. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to register an account on a Joomla! site with elevated privileges. (CVE-2016-8869)

 - A security bypass vulnerability exists in the Joomla! core user registration component due to insufficient checks on whether user registration is disabled. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to register an account on a Joomla! site even when account registration has been disabled. (CVE-2016-8870)

 - A flaw exists in the Joomla! core user modification component due to the improper processing of unfiltered data. An attacker can exploit this to modify the username, password, and user group for existing user accounts. (CVE-2016-9081)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The JSST and the Joomla! Security Center report : [20161001] - Core - Account Creation Inadequate checks allows for users to register on a site when registration has been disabled. [20161002] - Core - Elevated Privilege Incorrect use of unfiltered data allows for users to register on a site with elevated privileges. [20161003] - Core - Account Modifications Incorrect use of unfiltered data allows for existing user accounts to be modified; to include resetting their username, password, and user group assignments.

According to its self-reported version number, the Joomla! installation running on the remote web server is 3.4.4 or later but prior to 3.6.4. It is, therefore, affected by multiple vulnerabilities :

  - A privilege escalation vulnerability exists in the     Joomla! core user registration component due to improper     processing of unfiltered data. An unauthenticated,     remote attacker can exploit this, via a specially     crafted request, to register an account on a Joomla!     site with elevated privileges. (CVE-2016-8869)

  - A security bypass vulnerability exists in the Joomla!     core user registration component due to insufficient     checks on whether user registration is disabled. An     unauthenticated, remote attacker can exploit this, via a     specially crafted request, to register an account on a     Joomla! site even when account registration has been     disabled. (CVE-2016-8870)

  - A flaw exists in the Joomla! core user modification     component due to the improper processing of unfiltered     data. An attacker can exploit this to modify the     username, password, and user group for existing user     accounts. (CVE-2016-9081)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
98402	Joomla! 3.4.4 < 3.6.4 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
98401	Joomla! 3.5.x < 3.6.4 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
98400	Joomla! 3.6.x < 3.6.4 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
96060	FreeBSD : Joomla! -- multiple vulnerabilities (a27d234a-c7f2-11e6-ae1b-002590263bf5)	Nessus	FreeBSD Local Security Checks	critical
94355	Joomla! 3.4.4 < 3.6.4 Multiple Vulnerabilities	Nessus	CGI abuses	critical

Detections

Analytics

CVE-2016-8870

high

Tenable Plugins

critical

critical

critical

critical

critical