CVE-2018-20753 Kaseya Virtual System/Server Administrator (VSA): command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline May 4, 2022
What to do
- Install Kaseya's security update for Virtual System/Server Administrator (VSA). If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Kaseya VSA Remote Code Execution Vulnerability
- Product
- Kaseya Virtual System/Server Administrator (VSA)
- CISA description
- Kaseya VSA RMM allows unprivileged remote attackers to execute PowerShell payloads on all managed devices.
- Type of flaw
- Command or code injection
- Confirmed exploited
- Apr 13, 2022 — known to be used in ransomware attacks
- US federal patch deadline
- May 4, 2022
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Answering about CVE-2018-20753 ·
Questions about CVE-2018-20753
Is CVE-2018-20753 being exploited?
Yes. CISA added CVE-2018-20753 to its Known Exploited Vulnerabilities catalog on Apr 13, 2022, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2018-20753?
Install Kaseya's security update for Virtual System/Server Administrator (VSA). If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2018-20753?
Only if you use Kaseya Virtual System/Server Administrator (VSA). Aimed mostly at company systems — you are affected through the companies you use, not your own phone.