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.

Ubuntu Security Notice 2364-1 – Florian Weimer and Todd Sabin discovered that the Bash parser incorrectly handled memory. An attacker could possibly use this issue to bypass certain environment restrictions and execute arbitrary code. In addition, this update introduces a hardening measure which adds prefixes and suffixes around environment variable names which contain shell functions. Various other issues were also addressed.

Exinda WAN Optimization Suite version 7.0.0 (2160) suffers from cross site request forgery and cross site scripting vulnerabilities.

Red Hat Security Advisory 2014-1311-01 – 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. 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.

Red Hat Security Advisory 2014-1312-01 – 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. 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.

Openfiler version 2.99.1 suffers from a denial of service vulnerability.

Comersus Sophisticated Cart suffers from a database disclosure vulnerability.

Oscommerce version 2.3.4 suffers from cross site scripting, HTTP parameter pollution, and local file inclusion vulnerabilities.

NDBLOG version 0.1 suffers from cross site scripting and remote SQL injection vulnerabilities.

Get Simple CMS version 3.3.3 suffers from information disclosure, upload, and cross site scripting vulnerabilities.