SB2018062607 - Multiple vulnerabilities in Joomla!

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) PHP file inclusion (CVE-ID: CVE-2018-12712)

The vulnerability allows a remote attacker to include and execute arbitrary files on the local system.

The vulnerability exists due to autoload code checks classnames to be valid, using the "class_exists" function in PHP. This function however does not properly validate names in PHP 5.3, which can lead to local file inclusion vulnerability.

Successful exploitation of the vulnerability may allow an attacker to read arbitrary files and under certain circumstances even compromise vulnerable system but requires that Joomla! is using an old version of PHP 5.3.

2) Cross-site scripting (CVE-ID: CVE-2018-12711)

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 as a link of the current language within the language switcher module. 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

• https://developer.joomla.org/security-centre.html