Vulnerability CVE-2021-27884
Published: 2021-03-01   Modified: 2021-03-02

Description:
Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.

Type:

CWE-330

 (Use of Insufficiently Random Values)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.6/10
4.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
YMFE -> YAPI 

 References:
https://github.com/YMFE/yapi/issues/2117
https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi
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