PT-2021-5342 · Kaseya · Kaseya Vsa
Wietse Boonstra
·
Published
2021-04-01
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Updated
2026-04-18
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CVE-2021-30116
CVSS v2.0
10
Critical
| Vector | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
Kaseya VSA versions prior to 9.5.7
Description
The issue concerns a credential disclosure problem in Kaseya VSA, which was exploited in the wild in July 2021. By default, Kaseya VSA on-premise offers a download page at the URL
https://x.x.x.x/dl.asp, where clients for installation can be downloaded. When an attacker downloads a client for Windows and installs it, a file named KaseyaD.ini is generated, containing an Agent Guid and AgentPassword. These credentials can be used to log in on dl.asp and obtain a sessionId cookie, which can be used in subsequent attacks to bypass authentication. The vulnerability allows an attacker to penetrate the Kaseya installation and its clients. Approximately 1,500 devices were impacted by this issue.Recommendations
For versions prior to 9.5.7, update to version 9.5.7 or later to resolve the issue.
As a temporary workaround, consider restricting access to the
dl.asp page to minimize the risk of exploitation.
Avoid using the Agent Guid and AgentPassword credentials in the affected API endpoint until the issue is resolved.
Restrict access to the KaseyaD.ini file to prevent attackers from obtaining sensitive information.Exploit
Fix
Insufficiently Protected Credentials
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Weakness Enumeration
Related Identifiers
Affected Products
Kaseya Vsa