Multiple vulnerabilities have been discovered in Kaseya VSA that could allow for arbitrary code execution. Kaseya VSA is a software used by MSPs to remotely manage networks and endpoints. Successful exploitation of these vulnerabilities could result in arbitrary code execution within the context of the application, an attacker gaining the same privileges as the logged-on user, or the bypassing of security restrictions. Depending on the permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.

THREAT INTELLIGENCE:

It is reported that at least 50 direct Kaseya customers were impacted leading to between 800 to 1500 downstream businesses being exploited with these vulnerabilities.

Multiple vulnerabilities have been discovered in Kaseya VSA that could allow for arbitrary code execution. These vulnerabilities can be exploited remotely if an attacker locates a vulnerable Kaseya Web interface. An attacker can exploit this issue to execute arbitrary code in the context of the running Kaseya server process. Details of these vulnerabilities are as follows:

Credentials leak and business logic flaw - CVE-2021-30116

XSS vulnerability - CVE-2021-30119

2FA bypass - CVE-2021-30120

Network IOCs

35.226.94[.]113

161.35.239[.]148

162.253.124[.]162

Endpoint IOCs

Web Log Indicators 

POST /dl.asp curl/7.69.1

GET /done.asp curl/7.69.1

POST /cgi-bin/KUpload.dll curl/7.69.1

GET /done.asp curl/7.69.1

POST /cgi-bin/KUpload.dll curl/7.69.1

POST /userFilterTableRpt.asp curl/7.69.1

Successful exploitation of these vulnerabilities could result in arbitrary code execution within the context of the application, an attacker gaining the same privileges as the logged-on user, or the bypassing of security restrictions. Depending on the permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.