Vulnerability Details : CVE-2020-26231
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as 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 470 (v1.0.470) and v1.1.1.
Products affected by CVE-2020-26231
- cpe:2.3:a:octobercms:october:1.0.469:*:*:*:*:*:*:*
- cpe:2.3:a:octobercms:october:1.1.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-26231
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-26231
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.4
|
MEDIUM | AV:L/AC:M/Au:N/C:P/I:P/A:P |
3.4
|
6.4
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST | |
|
5.2
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L |
1.1
|
3.7
|
GitHub, Inc. |
CWE ids for CVE-2020-26231
-
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.Assigned by: security-advisories@github.com (Primary)
References for CVE-2020-26231
-
https://github.com/octobercms/october/security/advisories/GHSA-r89v-cgv7-3jhx
Bypass of fix for CVE-2020-15247, Twig sandbox escape · Advisory · octobercms/october · GitHubPatch;Third Party Advisory
-
https://github.com/octobercms/october/commit/d34fb8ab51108495a9a651b841202d935f4e12f7
Improve Twig security policy · octobercms/october@d34fb8a · GitHubPatch;Third Party Advisory
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