Known Exploited Vulnerability
10.0
CRITICAL
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.

Remotely Exploitable :

Yes !

Impact Score :

6.0

Exploitability Score :

3.9
CISA Notification
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.

Description :

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.

Required Action :

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.

Affected Products

The following products are affected by CVE-2021-30116 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Kaseya vsa_agent
2 Kaseya vsa_server
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

Updated: 3 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : May 2, 2024, 11 a.m. This repo has been linked 1 different CVEs too.

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

Updated: 2 months, 2 weeks ago
516 stars 32 fork 32 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1181 different CVEs too.

None

Updated: 2 years, 7 months ago
0 stars 0 fork 0 watcher
Born at : March 28, 2022, 4:54 a.m. This repo has been linked 1 different CVEs too.

None

Updated: 2 years, 11 months ago
0 stars 0 fork 0 watcher
Born at : Dec. 23, 2021, 1:06 p.m. This repo has been linked 4 different CVEs too.

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
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
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:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

69.48 }} 3.38%

score

0.98092

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability