CVE-2021-30116Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6
Explotación conocida — Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability
CISA confirmó el 03.11.2021 que esta vulnerabilidad se usa en ataques reales. Plazo para las agencias federales de EE. UU.: 17.11.2021.
Acción requerida: Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-30116
Descripción
Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| kaseya | vsa agent | < 9.5.0.24 | |
| kaseya | vsa server | < 9.5.7a |
Referencias y parches
- https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ Third Party Advisory
- https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 Vendor Advisory
- https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ Third Party Advisory
- https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ ExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116 US Government Resource
Coincidencias CPE (NVD) (2)
cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:*< 9.5.0.24cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:*< 9.5.7a