SB2019050703 - Multiple vulnerabilities in Joomla!

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2019-11809)

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 debug views functionality in com_users core component, when viewing users' permissions. A remote attacker can 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) Path traversal (CVE-ID: N/A)

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect patch against insecure deserialization when executing Phar archives. A remote attacker can use directory traversal sequences to bypass implemented protection mechanisms. 

Remediation

Install update from vendor's website.

References

• https://developer.joomla.org/security-centre.html#20190501
• https://developer.joomla.org/security-centre/781-20190502-core-by-passing-protection-of-phar-stream-wrapper-interceptor.html