RCE via malicious SNS subscription payload

Critical

ZogStriP published GHSA-jcjx-pvpc-qgwq

Oct 20, 2021

Package

Discourse (Discourse)

Affected versions

stable <= 2.7.8; beta <= 2.8.0.beta6; tests-passed <= 2.8.0.beta6

Patched versions

stable >= 2.7.9; beta >= 2.8.0.beta7; tests-passed >= 2.8.0.beta7

Description

Impact

A validation bug in the upstream aws-sdk-sns gem can lead to RCE in Discourse via a maliciously crafted request.

Patches

This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

Workarounds

To workaround the issue without updating, requests with a path starting /webhooks/aws could be blocked at an upstream proxy.

Severity

Critical

10.0

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

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