Vulnerability Details : CVE-2021-30120
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.
Products affected by CVE-2021-30120
- cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-30120
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 44 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-30120
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
9.9
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
3.1
|
6.0
|
MITRE | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-30120
-
The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-30120
-
https://csrit.divd.nl/DIVD-2021-00011
Permissions Required;Third Party Advisory
-
https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/
Kaseya VSA Limited Disclosure | DIVD CSIRTPatch;Third Party Advisory
-
https://csrit.divd.nl/CVE-2021-30120
Permissions Required;Third Party Advisory
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