Vulnerability · Published Jul 27, 2021 · Assigned by mitre

CVE-2021-36766

High 7.2

In plain English

A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.7% (higher than 90% of all known vulnerabilities).

Severity (CVSS NVD)7.2High

Exploit odds (30 days)3.7%top 10.3% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://hackerone.com/reports/1063039 x_refsource_MISC
20210719 [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability mailing-list, x_refsource_FULLDISC
http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html x_refsource_MISC