Medium severity · published May 3, 2021
CVE-2021-21264
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework
5.2
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
October · Octobercms
through 1.0.471; 1.1.0 through 1.1.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21264
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21264
Patch
https://github.com/octobercms/october/security/advisories/GHSA-fcr8-6q7r-m4wg
More from October
9.1
CVE-2021-32648
Account Takeover in Octobercms
9.8
CVE-2021-3311
An issue was discovered in October through build 471
9.8
CVE-2017-1000197
October CMS build 412 is vulnerable to file path modification in asset move functionality resulting in creating creating malicious files on the server
9.8
CVE-2017-1000196
October CMS build 412 is vulnerable to PHP code execution in the asset manager functionality resulting in site compromise and possibly other applications on the server
9.8
CVE-2017-1000194
October CMS build 412 is vulnerable to Apache configuration modification via file upload functionality resulting in site compromise and possibly other applications on the server