CVE-2020-17505

Vulnerability

Artica Web Proxy version 4.30.000000 contains a command injection vulnerability in the service-cmds parameter of cyrus.php. An authenticated attacker can inject arbitrary operating system commands, which are then executed with root privileges via the service_cmds_peform function. The vulnerability requires a valid authenticated session, as described in the reference [1].

Exploitation

To exploit this vulnerability, an attacker must first authenticate to the Artica Web Proxy administration interface. The attacker then sends a crafted POST request to cyrus.php with a malicious payload in the service-cmds parameter. The injected commands are passed to the service_cmds_peform function, which executes them without sanitization. No user interaction is required beyond the initial authentication [1].

Impact

Successful exploitation results in remote code execution (RCE) with full root privileges. The attacker can compromise the entire proxy server, leading to complete loss of confidentiality, integrity, and availability. This includes the ability to read, modify, or delete sensitive data, install persistent backdoors, and pivot to other systems on the network [1].

Mitigation

As of the publication date (2020-08-12), no official patch has been released for version 4.30.000000. The vendor should be contacted for an updated version. If upgrading is not possible, administrators should restrict access to the administrative interface to trusted IP addresses and enforce strong authentication. The vulnerability is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog [1].