CVE-2021-36766

Published on: 07/27/2021 12:00:00 AM UTC

Last Modified on: 08/09/2021 02:54:00 PM UTC

CVE-2021-36766

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Certain versions of Concrete5 from Concrete5 contain the following vulnerability:

Concrete5 through 8.5.5 deserializes Untrusted Data. The vulnerable code is located within the controllers/single_page/dashboard/system/environment/logging.php Logging::update_logging() method. User input passed through the logFile request parameter is not properly sanitized before being used in a call to the file_exists() PHP function. This can be exploited by malicious users to inject arbitrary PHP objects into the application scope (PHP Object Injection via phar:// stream wrapper), allowing them to carry out a variety of attacks, such as executing arbitrary PHP code.

CVE-2021-36766 has been assigned by [email protected] to track the vulnerability - currently rated as HIGH severity.

CVSS3 Score: 7.2 - HIGH

Attack Vector ^ⓘ	Attack Complexity	Privileges Required	User Interaction
NETWORK	LOW	HIGH	NONE
Scope	Confidentiality Impact	Integrity Impact	Availability Impact
UNCHANGED	HIGH	HIGH	HIGH

CVSS2 Score: 6.5 - MEDIUM

Access Vector^ⓘ	Access Complexity	Authentication
NETWORK	LOW	SINGLE
Confidentiality Impact	Integrity Impact	Availability Impact
PARTIAL	PARTIAL	PARTIAL

CVE References

Description	Tags ^ⓘ	Link
HackerOne	hackerone.com text/html	MISC hackerone.com/reports/1063039
Concrete5 8.5.5 Phar Deserialization ≈ Packet Storm	packetstormsecurity.com text/html	MISC packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html
Full Disclosure: [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability	seclists.org text/html	FULLDISC 20210719 [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability

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There are currently no QIDs associated with this CVE

Known Affected Configurations (CPE V2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Concrete5	Concrete5	All	All	All	-

cpe:2.3:a:concrete5:concrete5:*:*:*:-:*:*:*:*:

No vendor comments have been submitted for this CVE

Social Mentions

Source	Title	Posted (UTC)
@CVEreport	CVE-2021-36766 : Concrete5 through 8.5.5 deserializes Untrusted Data. The vulnerable code is located within the con… twitter.com/i/web/status/1…	2021-07-27 07:47:35
@LinInfoSec	Php - CVE-2021-36766: seclists.org/fulldisclosure…	2021-07-30 16:35:14