CVE-2018-14933
Published: 04 August 2018
Summary
CVE-2018-14933 is a critical-severity OS Command Injection (CWE-78) vulnerability in Nuuo Nvrmini Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.1% 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-3 (Access Enforcement).
Deeper analysis
CVE-2018-14933 is an OS command injection vulnerability (CWE-78) affecting the upgrade_handle.php script on NUUO NVRmini devices. Untrusted input to the uploaddir parameter during a writeuploaddir command is passed directly to a shell without sanitization, enabling arbitrary command execution.
Unauthenticated remote attackers can exploit the flaw over the network by supplying shell metacharacters in the uploaddir parameter. Successful exploitation grants full control of the affected device, allowing arbitrary code execution with impacts to confidentiality, integrity, and availability.
Public exploits for the issue have been available on Exploit-DB since 2018, and the vulnerability is listed in the CISA Known Exploited Vulnerabilities catalog, confirming observed in-the-wild exploitation. No vendor patch or mitigation details are provided in the referenced sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2018-6815
Vulnerability details
upgrade_handle.php on NUUO NVRmini devices allows Remote Command Execution via shell metacharacters in the uploaddir parameter for a writeuploaddir command.
- CWE(s)
- KEV Date Added
- 18 December 2024
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
Requires validation and sanitization of the uploaddir parameter before it is passed to a shell, directly blocking the command-injection vector.
Boundary-protection mechanisms can restrict or filter network traffic to upgrade_handle.php, limiting unauthenticated remote exploitation.
Enforces access-control decisions so that unauthenticated or unauthorized callers cannot invoke the writeuploaddir command.