Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.

中 5.2CVE-2020-15247 · GHSA-94vp-rmqv-5875 · 23/11/2020 公開 · 17/06/2026 更新

要点

CVE-2020-15247 は october/cms, october (octobercms) に影響する深刻度「中」 (CVSS 5.2) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.29%（全脆弱性の 22.0% より高い）。
対処：1.0.469 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/cms Packagist	`≥ 1.0.319, < 1.0.469`	`1.0.469`
october octobercms	`≥ 1.0.319, < 1.0.469`	`1.0.469`

概要

Impact

An authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.

This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.

Patches

Issue has been patched in Build 469 (v1.0.469) and v1.1.0.

Workarounds

Apply https://github.com/octobercms/october/compare/106daa2930de4cebb18732732d47d4056f01dd5b...7cb148c1677373ac30ccfd3069d18098e403e1ca to your installation manually if unable to upgrade to Build 469.

References

Reported by ka1n4t

For more information

If you have any questions or comments about this advisory:

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Threat assessment:

NVD の説明

October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October CMS from version 1.0.319 and before version 1.0.469, an authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. Issue has been patched in Build 469 (v1.0.469) and v1.1.0.