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Scientific Linux Security Update : bash on SL5.x, SL6.x i386/x86_64 (20140926) (Shellshock)

critical Nessus Plugin ID 77956

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Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

It was found that the fix for CVE-2014-6271 was incomplete, and Bash still allowed certain characters to be injected into other environments via specially crafted environment variables. An attacker could potentially use this flaw to override or bypass environment restrictions to execute shell commands. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue.
(CVE-2014-7169)

Applications which directly create bash functions as environment variables need to be made aware of changes to the way names are handled by this update.

Note: Docker users are advised to use 'yum update' within their containers, and to commit the resulting changes.

For additional information on CVE-2014-6271 and CVE-2014-7169, refer to https://securityblog.redhat.com/2014/09/24/bash-specially crafted-environment-variables-code-injection-attack/

Solution

Update the affected bash, bash-debuginfo and / or bash-doc packages.

See Also

http://www.nessus.org/u?f7d56c5e

Plugin Details

Severity: Critical

ID: 77956

File Name: sl_20140926_bash_on_SL5_x.nasl

Version: 1.17

Type: local

Agent: unix

Published: 9/29/2014

Updated: 12/5/2022

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:bash, x-cpe:/o:fermilab:scientific_linux, p-cpe:/a:fermilab:scientific_linux:bash-doc, p-cpe:/a:fermilab:scientific_linux:bash-debuginfo

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/26/2014

Vulnerability Publication Date: 9/24/2014

CISA Known Exploited Vulnerability Due Dates: 7/28/2022

Exploitable With

Core Impact

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

Reference Information

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

IAVA: 2014-A-0142