October CMS Session ID not invalidated after logout

緊急 9.8CVE-2021-3311 · GHSA-7ggw-h8pp-r95r · 05/02/2021 公開 · 17/06/2026 更新

要点

CVE-2021-3311 は october/rain, october (octobercms) に影響する深刻度「緊急」 (CVSS 9.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：2.9%（全脆弱性の 87.1% より高い）。
対処：1.1.2, 1.0.472 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
october/rain Packagist	`≥ 1.1.0, < 1.1.2< 1.0.472`	`1.1.21.0.472`
october octobercms	`≤ 1.0.471`	修正版なし

概要

Impact

When logging out, the session ID was not invalidated. This is not a problem while the user is logged out, but as soon as the user logs back in the old session ID would be valid again; which means that anyone that gained access to the old session cookie would be able to act as the logged in user. This is not a major concern for the majority of cases, since it requires a malicious party gaining access to the session cookie in the first place, but nevertheless has been fixed.

Patches

Issue has been patched in Build 472 (v1.0.472) and v1.1.2.

Workarounds

Apply https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024 to your installation manually if unable to upgrade to Build 472 or v1.1.2.

References

Reported by Anisio (Brazilian Information Security Analyst)
http://cve.circl.lu/cve/CVE-2021-3311

For more information

If you have any questions or comments about this advisory:

Email us at [email protected]

Threat assessment:

NVD の説明

An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.