Updated bash Shift_JIS packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6. Red Hat Product Security has rated this update as having Critical security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
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. 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. (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 users who require Shift_JIS encoding support with Bash built-in functions are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.