Postfix Script Remote Command Execution via Shellshock

critical Nessus Plugin ID 77969
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Synopsis

The remote mail server uses scripts that allow remote command execution via Shellshock.

Description

The remote host appears to be running Postfix. Postfix itself is not vulnerable to Shellshock; however, any bash script Postfix runs for filtering or other tasks could potentially be affected if the script exports an environmental variable from the content or headers of a message.

A negative result from this plugin does not prove conclusively that the remote system is not affected by Shellshock, only that any scripts Postfix may be running do not create the conditions that are exploitable via the Shellshock flaw.

Solution

Apply the referenced Bash patch or remove the Postfix scripts.

See Also

http://seclists.org/oss-sec/2014/q3/650

http://www.nessus.org/u?dacf7829

https://www.invisiblethreat.ca/post/shellshock/

Plugin Details

Severity: Critical

ID: 77969

File Name: shellshock_postfix_filters.nasl

Version: 1.13

Type: remote

Published: 9/29/2014

Updated: 7/27/2018

Dependencies: smtpserver_detect.nasl

Risk Information

VPR

Risk Factor: Critical

Score: 9.8

CVSS v2

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:postfix:postfix, cpe:/a:gnu:bash

Required KB Items: Settings/ThoroughTests

Exploit Available: true

Exploit Ease: Exploits are available

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

EDB-ID: 34765, 34766, 34777, 34896

IAVA: 2014-A-0142