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Files from Gabriel Follon

Qmail SMTP Bash Environment Variable Injection (Shellshock)

Posted Sep 29, 2017

Authored by Kyle George, Gabriel Follon, Mario Ledo | Site metasploit.com

This Metasploit module exploits a shellshock vulnerability on Qmail, a public domain MTA written in C that runs on Unix systems. Due to the lack of validation on the MAIL FROM field, it is possible to execute shell code on a system with a vulnerable BASH (Shellshock). This flaw works on the latest Qmail versions (qmail-1.03 and netqmail-1.06). However, in order to execute code, /bin/sh has to be linked to bash (usually default configuration) and a valid recipient must be set on the RCPT TO field (usually admin@exampledomain.com). The exploit does not work on the "qmailrocks" community version as it ensures the MAILFROM field is well-formed.

tags | exploit, shell, bash

systems | unix

advisories | CVE-2014-6271

SHA-256 | 312980cfe01d6ece2e6c4f8b4625555a7173a1cdd391e9346ac2f685ab5d2b6a

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