[arch-security] [Arch Linux Security Advisory 201409-2] bash: Remote code execution

Remi Gacogne rgacogne-arch at coredump.fr
Fri Sep 26 08:38:37 UTC 2014

Arch Linux Security Advisory 201409-2

Severity: Critical
Date    : 2014-09-26
CVE-ID  : CVE-2014-6271, CVE-2014-7169
Package : bash
Type    : Remote code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE-2014


The package bash before version 4.3.026-1 is vulnerable to remote code


Upgrade to 4.3.026-1.

$ pacman -Syu "bash>=4.3.026-1"

The problem has not been fixed upstream yet, though some patches were
released [1].


It is possible to work around this issue by replacing bash with a
non-affected shell, for example dash, when specifics bash features are
not needed.


GNU Bash through 4.3 bash43-025 processes trailing strings after
certain malformed function definitions in the values of environment
variables, which allows remote attackers to write to files or possibly
have unknown other impact 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.


[1] http://ftp.gnu.org/gnu/bash/bash-4.3-patches/

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