Critical severity · published Feb 5, 2021
CVE-2021-3311
An issue was discovered in October through build 471
9.8
CVSS
2.9%
EPSS
No
On KEV
Description
An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.9% · higher than 87% 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 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3311
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3311
Exploit
https://anisiosantos.me/october-cms-token-reactivation
Patch
https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024
Vendor Advisory
https://octobercms.com/forum/chan/announcements
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9.1
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