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CVE-2014-6271

Status Candidate

Overview

GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution, aka "ShellShock." NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.

Related Files

Pure-FTPd External Authentication Bash Environment Variable Code Injection
Posted Oct 2, 2014
Authored by Frank Denis, Spencer McIntyre, Stephane Chazelas | Site metasploit.com

This Metasploit module exploits the code injection flaw known as shellshock which leverages specially crafted environment variables in Bash. This exploit specifically targets Pure-FTPd when configured to use an external program for authentication.

tags | exploit, bash
advisories | CVE-2014-6271
SHA-256 | d1353f15ae7ed9aea8cd6b1644f5fbeada6291338684996bc3b3a388a0f3b2ec
XShock 0.1
Posted Oct 2, 2014
Authored by Sector-X

XShock is a python script that exploits the recent bash vulnerability. It includes four reverse shells that can be used during the attack.

tags | exploit, shell, python, bash
systems | unix
advisories | CVE-2014-6271
SHA-256 | 1a8bd993f5c64870806410d5fe62dac2cabbf441a4227dac519d0b5a72ebef22
Bash Me Some More
Posted Oct 1, 2014
Authored by Michal Zalewski, Paul Vixie

This is information regarding more bash vulnerabilities and how the original bash patches are ineffective.

tags | exploit, vulnerability, bash
advisories | CVE-2014-6271, CVE-2014-6277, CVE-2014-6278, CVE-2014-6279
SHA-256 | 9bef4f643cbc941c231d0995aa7df24f7322c03118f4cd7d60f56a5e05ccb428
VMware Security Advisory 2014-0010
Posted Oct 1, 2014
Authored by VMware | Site vmware.com

VMware Security Advisory 2014-0010 - VMware product updates address Bash security vulnerabilities.

tags | advisory, vulnerability, bash
advisories | CVE-2014-6271, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187
SHA-256 | 35f6ed13d7102c88ca22ea6b869c28a45351e9ff87730aeeba642d5f37e08c62
HP Security Bulletin HPSBHF03119
Posted Oct 1, 2014
Authored by HP | Site hp.com

HP Security Bulletin HPSBHF03119 - A potential security vulnerability has been identified with HP DreamColor Display running Bash Shell. This is the Bash Shell vulnerability known as "ShellShock" which could be exploited remotely to allow execution of code. NOTE: Only the Z27x model is vulnerable. Revision 1 of this advisory.

tags | advisory, shell, bash
advisories | CVE-2014-6271, CVE-2014-7169
SHA-256 | da9257ca6c57b23fa4805ff297044e25f462fa8dde75c23bf8abded80b03f407
HP Security Bulletin HPSBGN03117
Posted Oct 1, 2014
Authored by HP | Site hp.com

HP Security Bulletin HPSBGN03117 - A potential security vulnerability has been identified with HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell. This is the Bash Shell vulnerability known as "ShellShock" which could be exploited remotely to allow execution of code. NOTE: The vCAS product is vulnerable only if DHCP is enabled. Revision 1 of this advisory.

tags | advisory, remote, shell, bash
advisories | CVE-2014-6271, CVE-2014-7169
SHA-256 | 477153bb7561e72d2c4aa3bcf37dc3af2ca5f1778cd8673085ac6be3db145009
IPFire 2.15 Bash Command Injection
Posted Sep 30, 2014
Authored by Claudio Viviani

IPFire versions 2.15 and below core 82 authenticated CGI remote command injection exploit that leverages the bash vulnerability.

tags | exploit, remote, cgi, bash
advisories | CVE-2014-6271
SHA-256 | 012683f158b1fbd6670d51a9c56bc769954678884f249efc8a122651350705c8
GNU Bash 4.3 Command Injection
Posted Sep 29, 2014
Authored by Juan Sacco

ExploitPack GNU Bash versions 4.3 and below command injection exploit that leverages the User-Agent header against a given website.

tags | exploit, bash
advisories | CVE-2014-6271
SHA-256 | 142c835b75cbe04a6ca350ec7bb8fea228669c18def84dd5d24a93513e005852
Dhclient Bash Environment Variable Injection
Posted Sep 27, 2014
Authored by egypt, Stephane Chazelas | Site metasploit.com

When bash is started with an environment variable that begins with the string "() {", that variable is treated as a function definition and parsed as code. If extra commands are added after the function definition, they will be executed immediately. When dhclient receives an ACK that contains a domain name or hostname, they are passed to configuration scripts as environment variables, allowing us to trigger the bash bug. Because of the length restrictions and unusual networking scenario at time of exploitation, this Metasploit module achieves code execution by echoing our payload into /etc/crontab and cleans it up when we get a shell.

tags | exploit, shell, code execution, bash
advisories | CVE-2014-6271
SHA-256 | 5d7d7b3c51f3ee9f6de8df21a01a41ce128a74b5cdd4be3f7d65a7357f36ed1e
Apache mod_cgi Bash Environment Variable Code Injection
Posted Sep 26, 2014
Authored by juan vazquez, wvu, Stephane Chazelas | Site metasploit.com

This Metasploit module exploits a code injection in specially crafted environment variables in Bash, specifically targeting Apache mod_cgi scripts through the HTTP_USER_AGENT variable.

tags | exploit, bash
advisories | CVE-2014-6271
SHA-256 | bddccc35d3cda611c86307a7ce0074fc7d74f100f9a6dea0b6e39a478138e054
DHCP Client Bash Environment Variable Code Injection
Posted Sep 26, 2014
Authored by Ramon de C Valle, scriptjunkie, Stephane Chazelas | Site metasploit.com

This Metasploit module exploits a code injection in specially crafted environment variables in Bash, specifically targeting dhclient network configuration scripts through the HOSTNAME, DOMAINNAME, and URL DHCP options.

tags | exploit, bash
advisories | CVE-2014-6271
SHA-256 | 79d7a8dc657f6596bbdf6d89daca73b5c6faa99cc6ea47bed9be15fb8d04a23a
Gnu Bash 4.3 CGI REFERER Command Injection
Posted Sep 26, 2014
Authored by Simo Ben Youssef | Site morxploit.com

GNU Bash versions 4.3 and below remote command injection exploit that leverages the REFERER header on vulnerable CGI scripts. Launches a connect-back shell. Written in Perl.

tags | exploit, remote, shell, cgi, perl, bash
advisories | CVE-2014-6271, CVE-2014-7169
SHA-256 | 19dfcfb3d85be26b41d2f9316ffaebf7de4fe7c3b8fd4d6b1cf6a55a6f1ba395
Gnu Bash 4.3 CGI Scan Remote Command Injection
Posted Sep 26, 2014
Authored by Claudio Viviani, Stephane Chazelas

Gnu Bash versions 4.3 and below remote command injection exploit that leverages the User-Agent header via vulnerable CGI scripts. Written in Python.

tags | exploit, remote, cgi, python, bash
advisories | CVE-2014-6271, CVE-2014-7169
SHA-256 | 057996be27a48a42909a085ad63607f515c2c4f7a1da1dc7eddd802689cd126c
Mac OS X VMWare Fusion Root Privilege Escalation
Posted Sep 25, 2014
Authored by mubix, joev, Stephane Chazelas, juken | Site metasploit.com

This abuses the bug in bash environment variables (CVE-2014-6271) to get a suid binary inside of VMWare Fusion to launch our payload as root.

tags | exploit, root, bash
advisories | CVE-2014-6271
SHA-256 | f04f53cef923e1ebad417dccfb1f6d01ee754b3ddac0ef16fcb609fa3f055392
bashedCgi Remote Command Execution
Posted Sep 25, 2014
Authored by Shaun Colley, Stephane Chazelas | Site metasploit.com

bashedCgi is a quick and dirty Metasploit module to send the BASH exploit payload (CVE-2014-6271) to CGI scripts that are BASH-based or invoke BASH, to execute an arbitrary shell command.

tags | exploit, arbitrary, shell, cgi, bash
advisories | CVE-2014-6271
SHA-256 | 917183304ff31e505f18d434fcc284d5fe270c928e0cc5e96231c14eabb1aae3
Debian Security Advisory 3032-1
Posted Sep 25, 2014
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3032-1 - Stephane Chazelas discovered a vulnerability in bash, the GNU Bourne-Again Shell, related to how environment variables are processed. In many common configurations, this vulnerability is exploitable over the network, especially if bash has been configured as the system shell.

tags | advisory, shell, bash
systems | linux, debian
advisories | CVE-2014-6271
SHA-256 | 7d7ff0314912c76766865251c1493b2d34d061b327ed6f9d10226a30e97312dd
Slackware Security Advisory - bash Updates
Posted Sep 25, 2014
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New bash packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.

tags | advisory, bash
systems | linux, slackware
advisories | CVE-2014-6271
SHA-256 | 3d7981c8975006f49b5ad19b36029267c1636583968e19f0348fe0f6d92b8448
Mandriva Linux Security Advisory 2014-186
Posted Sep 25, 2014
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2014-186 - 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.

tags | advisory, remote, shell, bash
systems | linux, mandriva
advisories | CVE-2014-6271
SHA-256 | dd22cfcf0af7e59f09c6b9d501bda0a7b9030bdd6dc16f7d18f439d3bc864382
Bash Environment Variable Command Execution
Posted Sep 25, 2014
Authored by Florian Weimer

Due to a processing issue with environment variables it is possible to leverage bash for command execution through various methodologies.

tags | exploit, bash
advisories | CVE-2014-6271
SHA-256 | 10416de1b992e9a1adc732bd402d4760e0a76f5de17bf16ba8456967dcec154b
Bash Code Injection Proof Of Concept
Posted Sep 25, 2014
Authored by Prakhar Prasad, Subho Halder

Bash specially-crafted environment variable code injection proof of concept exploit that inserts the malicious payload into a User-Agent header and looks for a 500 response on a web server.

tags | exploit, web, proof of concept, bash
advisories | CVE-2014-6271
SHA-256 | 1273ee8212b97a8ecaf568588e84bc96f969eba4ff5386e89d28e7453e106454
Gentoo Linux Security Advisory 201409-09
Posted Sep 25, 2014
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201409-9 - A parsing flaw related to functions and environments in Bash could allow attackers to inject code. Versions less than 4.2_p48 are affected.

tags | advisory, bash
systems | linux, gentoo
advisories | CVE-2014-6271
SHA-256 | 8551811d553ddfdec75a15ba67cdecb9c82f0b7c97bfce099ffa5852dc723278
Ubuntu Security Notice USN-2362-1
Posted Sep 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2362-1 - Stephane Chazelas discovered that Bash incorrectly handled trailing code in function definitions. An attacker could use this issue to bypass environment restrictions, such as SSH forced command environments.

tags | advisory, bash
systems | linux, ubuntu
advisories | CVE-2014-6271
SHA-256 | 38879f99144687f30726884eb5642eea192bbd07a6ce0db592a56ffdc7e29b5b
Red Hat Security Advisory 2014-1294-01
Posted Sep 24, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-1294-01 - The GNU Bourne Again shell is a shell and command language interpreter compatible with the Bourne shell. 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.

tags | advisory, remote, shell, bash
systems | linux, redhat
advisories | CVE-2014-6271
SHA-256 | 367558e0af4bea38e2153ee9ee9c6ce9ff57eb72553269ce1c96319107027e35
Red Hat Security Advisory 2014-1295-01
Posted Sep 24, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-1295-01 - The GNU Bourne Again shell is a shell and command language interpreter compatible with the Bourne shell. Bash is the default shell for Red Hat Enterprise Linux. Shift_JIS, also known as "SJIS", is a character encoding for the Japanese language. This package provides bash support for the Shift_JIS encoding. 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.

tags | advisory, remote, shell, bash
systems | linux, redhat
advisories | CVE-2014-6271
SHA-256 | 0ab1587f987ce692a6ed8a870be5c168ea32c5c83293ed22e852410b266a93f8
Red Hat Security Advisory 2014-1293-01
Posted Sep 24, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-1293-01 - The GNU Bourne Again shell is a shell and command language interpreter compatible with the Bourne shell. 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.

tags | advisory, remote, shell, bash
systems | linux, redhat
advisories | CVE-2014-6271
SHA-256 | 11602d72b531b9a3376befaf2f40d6b9bc9bb40b1d354a5986c1541d7c56f5cd
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