CVE-2018-18370 Cross-site scripting in Symantec Advanced Secure Gateway (ASG)

Medium 6.1 Published 29 Aug 2019 Updated 5 Aug 2024

Remote attackers can inject malicious JavaScript via crafted FTP files in WebFTP mode, requiring FTP upload access to exploit.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-18370?

CVE-2018-18370 is a medium-severity cross-site scripting vulnerability in Symantec Advanced Secure Gateway (ASG), published on 29 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

The ASG/ProxySG FTP proxy WebFTP mode allows intercepting FTP connections where a user accesses an FTP server via a ftp:// URL in a web browser. A stored cross-site scripting (XSS) vulnerability in the WebFTP mode allows a remote attacker to inject malicious JavaScript code in ASG/ProxySG's web listing of a remote FTP server. Exploiting the vulnerability requires the attacker to be able to upload crafted files to the remote FTP server. Affected versions: ASG 6.6 and 6.7 prior to 6.7.4.2; ProxySG 6.5 prior to 6.5.10.15, 6.6, and 6.7 prior to 6.7.4.2.

Weakness: CWE-79

Which versions are affected by CVE-2018-18370?

It affects 2 products.

Products include Broadcom Advanced Secure Gateway, Broadcom Symantec Proxysg.

How do I fix CVE-2018-18370?

No fix has been published for CVE-2018-18370 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2018-18370 being exploited?

There is no known exploitation of CVE-2018-18370 in the wild and no public exploit code.

Sources

Also known as GHSA-m2px-9cv3-x8qj.