bugtraq - Bug in bash <= 4.3 [security feature bypassed]

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Message-ID: <538DD8BF.7060708@upv.es>
Date: Tue, 03 Jun 2014 16:16:31 +0200
From: Hector Marco <hecmargi@....es>
To: fulldisclosure@...lists.org
CC: oss-security@...ts.openwall.com, bugtraq@...urityfocus.com,
  advisories <advisories@...xperts.de>, bugs@...uritytracker.com
Subject: Bug in bash <= 4.3 [security feature bypassed]

Hi everyone,

Recently we discovered a bug in bash. After some time after reporting
it to bash developers, it has not been fixed.

We think that this is a security issue because in some circumstances
the bash security feature could be bypassed allowing the bash to be a
valid target shell in an attack.

We strongly recommend to patch your bash code.

Why don't fix this bug by simple adding mandatory "if" clause ?
Any comments about this issue are welcomed.

Details at:
http://hmarco.org/bugs/bash_4.3-setuid-bug.html

Thanks you,

Hector Marco
http://hmarco.org