Vulnerability · Published Oct 20, 2021 · Assigned by GitHub_M

CVE-2021-41163RCE via malicious SNS subscription payload

Critical 10.0

In plain English

A critical-severity injection in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 19.8% (higher than 97% of all known vulnerabilities).

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)19.8%top 2.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Discourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution. This resulted from a lack of validation in subscribe_url values. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. To workaround the issue without updating, requests with a path starting /webhooks/aws path could be blocked at an upstream proxy.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	tests-passed < 2.8.0.beta7beta < 2.8.0.beta7stable < 2.7.9

Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/discourse/discourse/security/advisories/GHSA-jcjx-pvpc-qgwq x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/fa3c46cf079d28b086fe1025349bb00223a5d5e9 x_refsource_MISC