CVE-2021-36766
First published: Tue Jul 27 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Concrete5 | <8.5.6 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-36766?
CVE-2021-36766 has a medium severity level due to its potential for deserializing untrusted data.
How do I fix CVE-2021-36766?
To fix CVE-2021-36766, update your Concrete5 installation to version 8.5.6 or later.
Which versions of Concrete5 are affected by CVE-2021-36766?
CVE-2021-36766 affects Concrete5 versions up to 8.5.5.
What kind of attack does CVE-2021-36766 enable?
CVE-2021-36766 enables remote code execution through unsafe deserialization of user inputs.
Is there a patch available for CVE-2021-36766?
Yes, a patch is included in Concrete5 version 8.5.6 which resolves the vulnerability.
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