Bash vuln. can affect OpenSSH

mancha mancha1 at zoho.com
Thu Sep 25 01:34:08 EST 2014


This is a friendly heads up regarding a recently-disclosed Bash
vulnerability that can impact behavior in the context of OpenSSH
connections (CVE-2014-6271).

In sum, the vulnerability relates to a flaw in Bash's evaluation of
environment variables such that attackers can use specially-crafted
environment variables for code injection [1].

For example, server-side OpenSSH restrictions might be bypassed with
maliciously-crafted TERM or SSH_ORIGINAL_COMMAND variables.

Bash has issued patches to fix this issue:

http://ftp.gnu.org/pub/gnu/bash/bash-3.0-patches/bash30-017
http://ftp.gnu.org/pub/gnu/bash/bash-3.1-patches/bash31-018
http://ftp.gnu.org/pub/gnu/bash/bash-3.2-patches/bash32-052
http://ftp.gnu.org/pub/gnu/bash/bash-4.0-patches/bash40-039
http://ftp.gnu.org/pub/gnu/bash/bash-4.1-patches/bash41-012
http://ftp.gnu.org/pub/gnu/bash/bash-4.2-patches/bash42-048
http://ftp.gnu.org/pub/gnu/bash/bash-4.3-patches/bash43-025

--mancha

[1] https://securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/
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