Deserialization in Concretecms Concrete Cms
CVE-2021-36766
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.037 (89.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000
Affected products
Weakness classification (CWE)
References
- hackerone.com/reports/1063039 (Permissions Required, Third Party Advisory)
- seclists.org/fulldisclosure/2021/Jul/36 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-36766?
- CVE-2021-36766 is a high-severity vulnerability in Concretecms Concrete Cms, classified under Deserialization of Untrusted Data. CVSS score: 7.2/10. Published 2021-07-30.
- How severe is CVE-2021-36766?
- High severity. CVSS v3 base score is 7.2 out of 10.