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CVE-2020-35729 is a critical unauthenticated OS command injection vulnerability in KLog Server version 2.4.1 and earlier. The vulnerability is present in the 'authenticate.php' endpoint, where the 'user' parameter is passed directly to shell_exec() without input validation or sanitization. This allows remote attackers to inject arbitrary shell commands via crafted POST requests, leading to remote code execution on the underlying Linux/x64 server. The flaw is trivially exploitable and does not require authentication or privileged access.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository contains a single Metasploit module targeting an unauthenticated command injection vulnerability in Klog Server versions 2.4.1 and prior (CVE-2020-35729). The exploit abuses the 'user' POST parameter in the 'authenticate.php' endpoint, which is passed unsanitized to PHP's shell_exec(), allowing arbitrary command execution as the apache user. Due to a default sudo configuration, the apache user can escalate privileges and execute commands as root without a password. The module supports multiple payloads, including Meterpreter reverse shells for x86/x64 Linux and a bash reverse shell for generic Unix systems. The exploit is weaponized, providing reliable unauthenticated remote root command execution. The main fingerprintable endpoint is '/actions/authenticate.php' over HTTPS (default port 443). The repository is structured as a single Ruby file compatible with the Metasploit framework, and is intended for use by penetration testers to gain root access to vulnerable Klog Server appliances.
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