Vulnerability · Published Apr 19, 2021 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity security flaw in grassroot-platform from grassrootza. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.8%top 44.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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).

Affected products (as reported)

Vendor	Product	Versions
grassrootza	grassroot-platform	< 1.3.1

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

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