CVE-2021-21264

Published May 3, 2021

Last updated 2 years ago

Overview

Description: October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. 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. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.
Source: security-advisories@github.com
NVD status: Analyzed

Hype score: Not currently trending

Risk scores

CVSS 3.1

Type: Primary
Base score: 5.2
Impact score: 3.7
Exploitability score: 1.1
Vector string: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
Severity: MEDIUM

CVSS 2.0

Type: Primary
Base score: 4.4
Impact score: 6.4
Exploitability score: 3.4
Vector string: AV:L/AC:M/Au:N/C:P/I:P/A:P

Weaknesses

nvd@nist.gov: NVD-CWE-Other
security-advisories@github.com: CWE-862

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "C6BF448C-7017-428E-B9BF-40069ACD3990",
            "versionEndIncluding": "1.0.471"
          },
          {
            "criteria": "cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "54A99E29-0CD5-4577-85A2-CD5A38FB58B8",
            "versionEndIncluding": "1.1.1",
            "versionStartIncluding": "1.1.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Social media

Risk scores

CVSS 3.1

CVSS 2.0

Weaknesses

Configurations

References