Qmail Remote Command Execution via Shellshock

critical Nessus Plugin ID 77970
New! Plugin Severity Now Using CVSS v3

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The remote mail server allows remote command execution via Shellshock.


The remote host appears to be running Qmail. A remote attacker can exploit Qmail to execute commands via a specially crafted MAIL FROM header if the remote host has a vulnerable version of Bash. This is due to the fact that Qmail does not properly sanitize input before setting environmental variables.

A negative result from this plugin does not prove conclusively that the remote system is not affected by Shellshock, only that Qmail could not be used to exploit the Shellshock flaw.


Apply the referenced Bash patch.

See Also




Plugin Details

Severity: Critical

ID: 77970

File Name: shellshock_qmail.nasl

Version: 1.12

Type: remote

Published: 9/29/2014

Updated: 7/27/2018

Dependencies: smtpserver_detect.nasl

Risk Information


Risk Factor: Critical

Score: 9.8


Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:qmail:qmail, cpe:/a:gnu:bash

Required KB Items: Settings/ThoroughTests

Exploit Available: true

Exploit Ease: Exploits are available

Exploited by Nessus: true

Patch Publication Date: 9/26/2014

Vulnerability Publication Date: 9/24/2014

Exploitable With

Core Impact

Metasploit (Apache mod_cgi Bash Environment Variable Code Injection (Shellshock))

Reference Information

CVE: CVE-2014-6271, CVE-2014-7169

BID: 70103, 70137

CERT: 252743

IAVA: 2014-A-0142

EDB-ID: 34765, 34766, 34777