CVE-2021-30116

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Summary

CVECVE-2021-30116
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-09 14:15:00 UTC
Updated2023-10-23 14:15:00 UTC
DescriptionKaseya 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.

Risk And Classification

EPSS: 0.856190000 probability, percentile 0.997020000 (date 2026-07-22)

CISA KEV: Listed on 2021-11-03; due 2021-11-17; ransomware use Known

Problem Types: CWE-522

CISA Known Exploited Vulnerability

VendorKaseya
ProductVirtual System/Server Administrator (VSA)
NameKaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2021-30116

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Kaseya Vsa All All All All
Application Kaseya Vsa Agent All All All All
Application Kaseya Vsa Server All All All All

References

ReferenceSourceLinkTags
Important Notice July 7th, 2021 – Kaseya MISC helpdesk.kaseya.com
Kaseya VSA REvil Ransomware Attack 2021 - ransomware attacks 2021 MISC www.secpod.com
Kaseya VSA Limited Disclosure | DIVD CSIRT MISC csirt.divd.nl
Kaseya Case Update 2 | DIVD CSIRT MISC csirt.divd.nl
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Vendor Comments And Credit

Discovery Credit

LEGACY: Discovered by Wietse Boonstra of DIVD

LEGACY: Additional research by Frank Breedijk of DIVD

Legacy QID Mappings

  • 730134 Kaseya VSA Remote Code Execution Vulnerability (Zero Day)

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