Beijing Topsec Network Security Tianxin Internet Behavior Management System prior 4.0.0.7_20210716.180815 Reporter objClass os command injection

Summaryinfo

A vulnerability identified as critical has been detected in Beijing Topsec Network Security Tianxin Internet Behavior Management System. The affected element is an unknown function of the component Reporter Component. This manipulation of the argument objClass causes os command injection. This vulnerability is registered as CVE-2021-4473. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Beijing Topsec Network Security Tianxin Internet Behavior Management System. Affected by this vulnerability is some unknown functionality of the component Reporter Component. The manipulation of the argument objClass with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Tianxin Internet Behavior Management System contains a command injection vulnerability in the Reporter component endpoint that allows unauthenticated attackers to execute arbitrary commands by supplying a crafted objClass parameter containing shell metacharacters and output redirection. Attackers can exploit this vulnerability to write malicious PHP files into the web root and achieve remote code execution with the privileges of the web server process. This vulnerability has been fixed in version NACFirmware_4.0.0.7_20210716.180815_topsec_0_basic.bin. Exploitation evidence was first observed by the Shadowserver Foundation on 2024-06-01 (UTC).

It is possible to read the advisory at cnvd.org.cn. This vulnerability is known as CVE-2021-4473 since 01/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 4.0.0.7_20210716.180815 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2021-34776). Be aware that VulDB is the high quality source for vulnerability data.

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• Beijing Topsec Network Security

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• Tianxin Internet Behavior Management System

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