High severity · published Mar 10, 2021
CVE-2021-21265
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework
7.5
CVSS
1.7%
EPSS
No
On KEV
Description
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
October · Octobercms
before 1.1.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21265
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21265
github.com
https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d
Patch
https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6
github.com
https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30
Patch
https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0
Patch
https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp
packagist.org
https://packagist.org/packages/october/backend
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