CVE-2021-30116 Kaseya Virtual System/Server Administrator (VSA) Information Disclosure
Attackers can extract agent credentials from a public download page to obtain session cookies, bypassing authentication and accessing sensitive system data.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-30116?
CVE-2021-30116 is a critical vulnerability in n/a, published on 9 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-522
Which versions are affected by CVE-2021-30116?
It affects 2 products.
Products include Kaseya Vsa Agent, Kaseya Vsa Server.
How do I fix CVE-2021-30116?
No fix has been published for CVE-2021-30116 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Is CVE-2021-30116 being exploited?
Yes. Attackers have exploited CVE-2021-30116 in the wild since at least 3 Nov 2021, including in ransomware campaigns.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-qm28-hjhx-pwqg.