The security expert Troy Mursch observed a
Early this week, an anonymous security researcher publicly disclosed a zero-day remote code execution flaw, tracked as CVE-2019-16759, in the vBulletin forum software and the exploit code to trigger it.
The vulnerability could be exploited remotely by an unauthenticated attacker. The PoC exploit published by the hacker works on vBulletin versions 5.0.0 till the latest 5.5.4.
The zero-day flaw in the forum software resides in the way an internal widget file of the forum software package accepts configurations via the URL parameters. The expert discovered that the package fails to validate the parameters, an attacker could exploit it to inject commands and remotely execute code on the vulnerable install.
The threat actor behind the
The above images show how the attacker modifies the source code in the includes/vb5/
Chaouki Bekrar, founder and CEO of the Zerodium exploit broker, confirmed that the
“The availability of a working exploit is aggravated by another publicly posted script that uses the Shodan search site to find vulnerable servers. Attackers can use it to generate a list of