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CVE-2021-41163: RCE via malicious SNS subscription payload

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.

CVE
#web#rce#aws

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.

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