CVE-2021-30116
Kaseya Virtual System/Server Administrator (VSA) I - [Actively Exploited]
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.
INFO
Published Date :
July 9, 2021, 2:15 p.m.
Last Modified :
July 29, 2024, 6:30 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Kaseya Virtual System/Server Administrator (VSA) contains an information disclosure vulnerability allowing an attacker to obtain the sessionId that can be used to execute further attacks against the system.
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2021-30116 has a 4 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-30116.
| URL | Resource |
|---|---|
| https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ | Third Party Advisory |
| https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ | Third Party Advisory |
| https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 | Vendor Advisory |
| https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
None
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-30116 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-30116 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Jul. 29, 2024
Action Type Old Value New Value Changed Reference Type https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ No Types Assigned https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ Exploit, Third Party Advisory -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Oct. 23, 2023
Action Type Old Value New Value Added Reference https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ [No Types Assigned] -
CWE Remap by [email protected]
Aug. 08, 2023
Action Type Old Value New Value Changed CWE NVD-CWE-noinfo CWE-522 -
CWE Remap by [email protected]
Jul. 12, 2022
Action Type Old Value New Value Changed CWE CWE-522 NVD-CWE-noinfo -
CVE Modified by [email protected]
Apr. 04, 2022
Action Type Old Value New Value Changed Description Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. 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. -
Modified Analysis by [email protected]
Mar. 25, 2022
Action Type Old Value New Value -
CVE Modified by [email protected]
Feb. 07, 2022
Action Type Old Value New Value Added CVSS V3.1 MITRE AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H -
Reanalysis by [email protected]
Aug. 19, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:* versions up to (excluding) 9.5.7 OR *cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:* versions up to (excluding) 9.5.0.24 *cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:* versions up to (excluding) 9.5.7a -
Initial Analysis by [email protected]
Jul. 09, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ No Types Assigned https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ Third Party Advisory Changed Reference Type https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ No Types Assigned https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ Third Party Advisory Changed Reference Type https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 No Types Assigned https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 Vendor Advisory Added CWE NIST CWE-522 Added CPE Configuration OR *cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:* versions up to (excluding) 9.5.7
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-30116 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-30116
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
66.11 }} -18.09%
score
0.97964
percentile