SB2018041215 - XSS in jDownloads component for Joomla!

Description

This security bulletin contains information about 1 security vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2018-10068)

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 "/administrator/components/com_jdownloads/assets/plupload/js/Moxie.swf" file passed via the "target%g" parameter. 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.

PoC:

http://[host]/administrator/components/com_jdownloads/assets/plupload/js/Moxie.swf?target%g=alert&uid%g=nice

Remediation

Install update from vendor's website.

References

• http://www.jdownloads.com/index.php/news/264-jdownloads-3-2-59-published.html
• https://vel.joomla.org/resolved/2150-jdownloads-3-2-58-xss-cross-site-scripting
• https://www.exploit-db.com/exploits/44471/