GHSA-fcr8-6q7r-m4wg

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Source
https://github.com/advisories/GHSA-fcr8-6q7r-m4wg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-fcr8-6q7r-m4wg/GHSA-fcr8-6q7r-m4wg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-fcr8-6q7r-m4wg
Aliases
Published
2021-05-04T17:42:33Z
Modified
2023-11-08T04:04:39.499189Z
Severity
  • 5.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L CVSS Calculator
Summary
Bypass of fix for CVE-2020-26231, Twig sandbox escape
Details

Impact

A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 & CVE-2020-15247:

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 472 (v1.0.472) and v1.1.2.

Workarounds

Apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.

References

Reported by ka1n4t

For more information

If you have any questions or comments about this advisory: * Email us at hello@octobercms.com

Threat assessment:

<img width="1108" alt="Screen Shot 2020-10-10 at 1 21 13 PM" src="https://user-images.githubusercontent.com/7253840/95663316-7de28b80-0afb-11eb-999d-a6526cf78709.png">

Database specific 
{
    "nvd_published_at": "2021-05-03T16:15:00Z",
    "github_reviewed_at": "2021-05-03T15:59:55Z",
    "severity": "MODERATE",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-862"
    ]
}
References

Affected packages

Packagist / october/cms

Package

Name
october/cms
Purl
pkg:composer/october/cms

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.0.471
Fixed
1.0.472

Affected versions

1.*

1.0.471

v1.*

v1.0.471

Packagist / october/cms

Package

Name
october/cms
Purl
pkg:composer/october/cms

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.1.1
Fixed
1.1.2

Affected versions

1.*

1.1.1

v1.*

v1.1.1