CVE-2018-20062
Published: 11 December 2018
Summary
CVE-2018-20062 is a critical-severity an unspecified weakness vulnerability in 5None Nonecms. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.0% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-6 (Least Privilege).
Deeper analysis
CVE-2018-20062 is a remote code execution vulnerability in NoneCms version 1.3 that stems from unsafe handling of the filter parameter in the ThinkPHP component thinkphp/library/think/App.php. The flaw permits an attacker to supply a crafted query string, such as s=index/\think\Request/input&filter=phpinfo&data=1, that causes the application to execute arbitrary PHP code.
Unauthenticated remote attackers can exploit the issue over the network by sending a malicious HTTP request. Successful exploitation grants full control over the affected application, enabling arbitrary code execution with impacts on confidentiality, integrity, and availability.
The vulnerability is documented in public exploit repositories and a GitHub issue for NoneCms, and it appears in the CISA Known Exploited Vulnerabilities catalog, confirming observed real-world exploitation. No specific patch or mitigation details are provided in the referenced sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2018-12637
Vulnerability details
An issue was discovered in NoneCms V1.3. thinkphp/library/think/App.php allows remote attackers to execute arbitrary PHP code via crafted use of the filter parameter, as demonstrated by the s=index/\think\Request/input&filter=phpinfo&data=1 query string.
- CWE(s)
- KEV Date Added
- 03 November 2021
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks the crafted filter parameter in the query string from being interpreted as executable PHP code.
Disables unnecessary PHP functions and language features that the filter parameter abuse relies on.
Limits the web application process to the minimum privileges needed, reducing impact of any successful code execution.