CVE-2018-20753 Kaseya VSA Remote Code Execution

What is CVE-2018-20753?

CVE-2018-20753 is a critical missing authorization vulnerability in n/a, published on 5 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.

Which versions are affected by CVE-2018-20753?

It affects 1 product.

Products include Kaseya Virtual System Administrator.

How do I fix CVE-2018-20753?

No fix has been published for CVE-2018-20753 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 4 May 2022.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-20753 being exploited?

Yes. Attackers have exploited CVE-2018-20753 in the wild since at least 13 Apr 2022, including in ransomware campaigns.

Other vulnerabilities in n/a

• CVE-2015-6922 Auth bypass in n/a Critical 9.8
• CVE-2015-6589 Path traversal in n/a High 8.8
• CVE-2019-15506 Information disclosure in n/a High 7.5
• CVE-2017-12410 Race condition in n/a High 7.4
• CVE-2015-2863 Open redirect in n/a Medium 4.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-hhg2-f289-m44w.