Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | < 8.5.6 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-DeserializationExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2021/Jul/36ExploitMailing ListThird Party Advisory
- https://hackerone.com/reports/1063039Permissions RequiredThird Party Advisory
- http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-DeserializationExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2021/Jul/36ExploitMailing ListThird Party Advisory
- https://hackerone.com/reports/1063039Permissions RequiredThird Party Advisory
FAQ
What is CVE-2021-36766?
CVE-2021-36766 is a vulnerability with a CVSS score of 7.2 (HIGH). 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 i...
How severe is CVE-2021-36766?
CVE-2021-36766 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-36766?
Check the references section above for vendor advisories and patch information. Affected products include: Concretecms Concrete Cms.