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CVE-2021-29455— Missing validation of JWT signature in `grassrootza/grassroot-platform`

Quick assessment

Affected
grassrootza grassroot-platform
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Luke Jordan grassroot-platform是Luke Jordan开源的一个应用软件。一个能够更快，更便宜和更容易地持续组织和动员低收入社区中的人们的应用程序。 Luke Jordan Grassroot Platform 存在安全漏洞，该漏洞允许伪造一个有效的JWT。

CVSS 7.5 · High EPSS 0.76% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-29455

Vulnerability Information
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Vulnerability Title
Missing validation of JWT signature in `grassrootza/grassroot-platform`
Source: CVE Program / CVE List V5
Vulnerability Description
Grassroot Platform is an application to make it faster, cheaper and easier to persistently organize and mobilize people in low-income communities. Grassroot Platform before master deployment as of 2021-04-16 did not properly verify the signature of JSON Web Tokens when refreshing an existing JWT. This allows to forge a valid JWT. The problem has been patched in version 1.3.1 by deprecating the JWT refresh function, which was an overdue deprecation regardless (the "refresh" flow is no longer used).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Luke Jordan Grassroot Platform 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Luke Jordan grassroot-platform是Luke Jordan开源的一个应用软件。一个能够更快，更便宜和更容易地持续组织和动员低收入社区中的人们的应用程序。 Luke Jordan Grassroot Platform 存在安全漏洞，该漏洞允许伪造一个有效的JWT。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
grassrootza grassroot-platform < 1.3.1 -

II. Public POCs for CVE-2021-29455

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III. Intelligence Information for CVE-2021-29455

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Patches & Fixes for CVE-2021-29455 (1)

Other References for CVE-2021-29455 (1)

IV. Related Vulnerabilities

Same weakness: CWE-347

V. Comments for CVE-2021-29455

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