Vulnerability Details : 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.
Products affected by CVE-2021-36766
- cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-36766
3.70%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 92 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-36766
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | AV:N/AC:L/Au:S/C:P/I:P/A:P |
8.0
|
6.4
|
NIST | |
|
7.2
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
1.2
|
5.9
|
NIST |
CWE ids for CVE-2021-36766
-
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-36766
-
https://hackerone.com/reports/1063039
Sign inPermissions Required;Third Party Advisory
-
http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html
Concrete5 8.5.5 Phar Deserialization ≈ Packet StormExploit;Third Party Advisory;VDB Entry
-
http://seclists.org/fulldisclosure/2021/Jul/36
Full Disclosure: [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization VulnerabilityExploit;Mailing List;Third Party Advisory
Jump to