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RHEL 6 / 7 : bash (RHSA-2014:1293)

critical Nessus Plugin ID 77828

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Synopsis

The remote Red Hat host is missing a security update for bash.

Description

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2014:1293 advisory.

 The GNU Bourne Again shell (Bash) is a shell and command language interpreter compatible with the Bourne shell (sh). Bash is the default shell for Red Hat Enterprise Linux.

 A flaw was found in the way Bash evaluated certain specially crafted environment variables. An attacker could 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-2014-6271)

 For additional information on the CVE-2014-6271 flaw, refer to the Knowledgebase article at https://access.redhat.com/articles/1200223

 Red Hat would like to thank Stephane Chazelas for reporting this issue.

 All bash users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL bash package based on the guidance in RHSA-2014:1293.

See Also

http://www.nessus.org/u?b2a1b4d8

https://access.redhat.com/articles/1200223

https://access.redhat.com/errata/RHSA-2014:1293

https://access.redhat.com/security/updates/classification/#critical

https://bugzilla.redhat.com/show_bug.cgi?id=1141597

Plugin Details

Severity: Critical

ID: 77828

File Name: redhat-RHSA-2014-1293.nasl

Version: 1.42

Type: local

Agent: unix

Published: 9/25/2014

Updated: 4/15/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

CVSS Score Source: CVE-2014-6271

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:5, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:bash, p-cpe:/a:redhat:enterprise_linux:bash-doc

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: 9/24/2014

Vulnerability Publication Date: 9/24/2014

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

Exploitable With

Core Impact

Metasploit (Qmail SMTP Bash Environment Variable Injection (Shellshock))

Reference Information

CVE: CVE-2014-6271

CWE: 78

IAVA: 2014-A-0142

RHSA: 2014:1293