Command execution in NUUO NVRmini 2

1) OS command injection

EUVDB-ID: #VU16212

Risk: High

CVSSv3.1: 8.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-15716

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote authenticated attacker to execute arbitrary shell commands on the target system.

The vulnerability exists in upgrade_handle.php due to insufficient validation of user-supplied input. A remote authenticated attacker can send specially crafted requests containing shell metacharacters in the uploaddir parameter for a writeuploaddir command to bypass the uploaddir filter and execute OS commands with root privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: the vulnerability exists due to insufficient patch for CVE-2018-14933.

Mitigation

Update to version 3.10.0 or later.

Vulnerable software versions

NUUO NVRmini 2: 3.0.0.63 - 3.9.1

External links

http://www.tenable.com/security/research/tra-2018-41
http://github.com/tenable/poc/tree/master/nuuo/nvrmini2/cve_2018_15716

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.