CVE-2021-30120

 

Published at: - 09-07-2021 04:15

Last modified: - 29-04-2022 08:21

Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

 

Verification logic

 

Reference

• https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/
• https://csrit.divd.nl/DIVD-2021-00011
• https://csrit.divd.nl/CVE-2021-30120

 

Keywords

NVD

 

CVE-2021-30120

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures