GLSA 201409-10: Bash: Code Injection (Updated fix for GLSA 201409-09)

http://security.gentoo.org/

Severity:	high
Title:	Bash: Code Injection (Updated fix for GLSA 201409-09)
Date:	09/25/2014
Bugs:	#523592
ID:	201409-10

Synopsis

A parsing flaw related to functions and environments in Bash could allow attackers to inject code. The unaffected packages listed in GLSA 201409-09 had an incomplete fix.

Background

Bash is the standard GNU Bourne Again SHell.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-shells/bash	< 4.2_p48-r1	>= 3.1_p18-r1	All supported architectures

Description

Stephane Chazelas reported that Bash incorrectly handles function definitions, allowing attackers to inject arbitrary code (CVE-2014-6271). Gentoo Linux informed about this issue in GLSA 201409-09.

Tavis Ormandy reported that the patch for CVE-2014-6271 was incomplete. As such, this GLSA supersedes GLSA 201409-09.

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-r1:3.1"

All Bash 3.2 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-shells/bash-3.2_p52-r1:3.2"

All Bash 4.0 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-shells/bash-4.0_p39-r1:4.0"

All Bash 4.1 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-shells/bash-4.1_p12-r1:4.1"

All Bash 4.2 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p48-r1"

References

CVE-2014-7169

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201409-10.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.