CVE-2021-29455

Missing validation of JWT signature in `grassrootza/grassroot-platform`

CVSS 7.5 HIGHEPSS 0.8%CWE-347

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.8%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 Apr 2021Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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).

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

Affected products

grassrootza · grassroot-platform

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References

https://github.com/grassrootza/grassroot-platform/https://github.com/grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd813a7af7d67f https://github.com/grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-6734