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Critical 9.9

AWS REXのSSMドキュメントにroot実行の脆弱性、削除で対処

CVE-2026-122193 First seen on SecPulse

Summary

REXのサンプルスクリプトで作ったSSMドキュメントから、呼び出しを許可された認証済みユーザーがroot権限でコマンドを実行できます。スクリプトを実行した各アカウントとリージョンで、Rex-ROとRex-RWを削除してください。

AI summary

Produced by SecPulse using an external AI model; it may contain mistakes. Check the original description and references below before acting on it.

REXのサンプルスクリプトで作ったSSMドキュメントから、呼び出しを許可された認証済みユーザーがroot権限でコマンドを実行できます。スクリプトを実行した各アカウントとリージョンで、Rex-ROとRex-RWを削除してください。

Original description The description as published by the source.

OS command injection in the example SSM document provisioning script in Trusted Remote Execution (REX) before 2026-07-28 might allow an authenticated remote user who is permitted to invoke the Rex-RO or Rex-RW SSM document to execute arbitrary commands as root on the managed instance, bypassing Cedar policy enforcement.

To remediate this issue, users should delete any Rex-RO and Rex-RW SSM documents created from the example script, in each account and Region where it was run.

Source: CVE.org (CVE Program・cvelistV5) NVD

References

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