SB2018031917 - Cross-site scripting in Grav CMS

Description

This security bulletin contains information about 1 security vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2018-5233)

Vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability is caused by an input validation error in system/src/Grav/Common/Twig/Twig.php when processing data passed via the PATH_INFO parameter to admin/tools URL. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security 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

• http://www.openwall.com/lists/oss-security/2018/03/15/1
• https://sysdream.com/news/lab/2018-03-15-cve-2018-5233-grav-cms-admin-plugin-reflected-cross-site-scripting-xss-vulnerability/