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CVE-2021-21315 is a command injection vulnerability in the 'systeminformation' npm package for Node.js, affecting versions prior to 5.3.1. The vulnerability arises from improper sanitization of service parameters in functions such as si.inetLatency(), si.inetChecksite(), si.services(), and si.processLoad(). Attackers can exploit this flaw by passing specially crafted input, leading to arbitrary OS command execution.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository is a Proof-of-Concept (PoC) exploit for CVE-2021-21315, a command injection vulnerability in the 'systeminformation' npm package (versions prior to 5.3.1). The main code file, index.js, is a Node.js application using Express to expose two HTTP API endpoints: '/api/getServices' and '/api/checkSite'. Both endpoints pass user-supplied query parameters directly to functions in the vulnerable 'systeminformation' library. The PoC demonstrates that by sending a specially crafted GET request with an array parameter (e.g., 'name[]=$(echo -e 'Sekurak' > pwn.txt)'), an attacker can bypass input sanitization and execute arbitrary shell commands on the server. The README provides detailed reproduction steps and discusses the potential impact, including file manipulation, script execution, and reverse shells. The exploit is effective on Linux systems running the vulnerable package and highlights the risk of unsanitized user input in system command contexts.
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