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CVE-2019-3999 is a local privilege escalation vulnerability in Druva inSync Windows Client version 6.5.0, specifically in the inSyncCPHwnet64.exe component. The vulnerability arises from improper neutralization of special elements used in OS commands, allowing a local, unauthenticated attacker to execute arbitrary operating system commands with SYSTEM privileges by sending crafted RPC requests over TCP port 6064.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit module targeting a local privilege escalation vulnerability in the Druva inSync client for Windows (CVE-2019-3999 and CVE-2020-5752). The exploit abuses an RPC service (inSyncCPHwnet64.exe) listening on TCP port 6064 on the local interface. By sending a specially crafted RPC type 5 message with a user-controlled program path, the attacker can execute arbitrary commands as SYSTEM. The module writes a payload executable (default: Meterpreter reverse shell) to a writable directory (default: %TEMP%), then triggers its execution via the vulnerable service. The exploit is operational and provides SYSTEM-level access if successful. The code is written in Ruby and is structured as a standard Metasploit local exploit module, with all logic contained in a single file.
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