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A buffer overflow vulnerability exists in SysGauge 1.5.18 within the SMTP connection verification functionality. When connecting to an SMTP server, if the server responds with an excessively long 220 ("Service ready") string, the application fails to properly validate the length of the response, resulting in a buffer overflow. This can be exploited by an attacker controlling a malicious SMTP server to execute arbitrary code on the client system.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module exploit targeting SysGauge 1.5.18 (CVE-2017-6416). The exploit sets up a malicious SMTP server (default port 25) and waits for a connection from a vulnerable SysGauge client performing SMTP server validation. Upon connection, the server sends a specially crafted 220 service ready response containing a buffer overflow payload. The payload is split and aligned to bypass stack jumbling in the target, ultimately resulting in an unprivileged shell on the victim system. The exploit is operational, allowing for customizable Metasploit payloads, and is not privileged. The only fingerprintable endpoint is the TCP port the server listens on. The code is written in Ruby and is structured as a standard Metasploit module.
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