CVE-2021-30120
Kaseya VSA Two-Factor Authentication Bypass Vulnerability
Description
Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement. The need to use 2FA for authentication in enforce client-side instead of server-side and can be bypassed using a local proxy. Thus rendering 2FA useless. Detailed description --- During the login process, after the user authenticates with username and password, the server sends a response to the client with the booleans MFARequired and MFAEnroled. If the attacker has obtained a password of a user and used an intercepting proxy (e.g. Burp Suite) to change the value of MFARequered from True to False, there is no prompt for the second factor, but the user is still logged in.
INFO
Published Date :
July 9, 2021, 2:15 p.m.
Last Modified :
July 12, 2022, 5:42 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.1
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-2021-30120.
| URL | Resource |
|---|---|
| https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ | Patch Third Party Advisory |
| https://csrit.divd.nl/CVE-2021-30120 | Permissions Required Third Party Advisory |
| https://csrit.divd.nl/DIVD-2021-00011 | Permissions Required 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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-30120 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-30120 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.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Jul. 12, 2022
Action Type Old Value New Value Changed CWE CWE-863 CWE-669 -
Modified Analysis by [email protected]
Apr. 29, 2022
Action Type Old Value New Value Changed Reference Type https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ Third Party Advisory https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ Patch, Third Party Advisory -
CVE Modified by [email protected]
Apr. 04, 2022
Action Type Old Value New Value Changed Description Kaseya VSA through 9.5.7 allows attackers to bypass the 2FA requirement. Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement. The need to use 2FA for authentication in enforce client-side instead of server-side and can be bypassed using a local proxy. Thus rendering 2FA useless. Detailed description --- During the login process, after the user authenticates with username and password, the server sends a response to the client with the booleans MFARequired and MFAEnroled. If the attacker has obtained a password of a user and used an intercepting proxy (e.g. Burp Suite) to change the value of MFARequered from True to False, there is no prompt for the second factor, but the user is still logged in. -
Modified Analysis by [email protected]
Mar. 01, 2022
Action Type Old Value New Value Changed Reference Type https://csrit.divd.nl/CVE-2021-30120 No Types Assigned https://csrit.divd.nl/CVE-2021-30120 Permissions Required, Third Party Advisory Changed Reference Type https://csrit.divd.nl/DIVD-2021-00011 No Types Assigned https://csrit.divd.nl/DIVD-2021-00011 Permissions Required, Third Party Advisory -
CVE Modified by [email protected]
Feb. 07, 2022
Action Type Old Value New Value Added CVSS V3.1 MITRE AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added Reference https://csrit.divd.nl/DIVD-2021-00011 [No Types Assigned] Added Reference https://csrit.divd.nl/CVE-2021-30120 [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 12, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 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 Added CWE NIST CWE-863 Added CPE Configuration OR *cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:* versions up to (including) 9.5.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-30120 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-2021-30120
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.12 }} 0.01%
score
0.44141
percentile