Bash: Code Injection

Background

Bash is the standard GNU Bourne Again SHell.

Description

Stephane Chazelas reported that Bash incorrectly handles function definitions, allowing attackers to inject arbitrary code.

Impact

A remote attacker could exploit this vulnerability to execute arbitrary commands even in restricted environments.

Workaround

There is no known workaround at this time.

Resolution

All Bash 3.1 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-shells/bash-3.1_p18:3.1"

All Bash 3.2 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-shells/bash-3.2_p52:3.2"

All Bash 4.0 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-shells/bash-4.0_p39:4.0"

All Bash 4.1 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-shells/bash-4.1_p12:4.1"

All Bash 4.2 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p48"