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Re: Chained command prints password in Clear Text and breaks BASH Sessio


From: Chris Down
Subject: Re: Chained command prints password in Clear Text and breaks BASH Session until logout
Date: Fri, 12 Jul 2013 01:29:14 +0800

On 12 Jul 2013 01:25, "Jason Sipula" <address@hidden> wrote:
>
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-redhat-linux-gnu'
> -DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
> -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -D_GNU_SOURCE
> -DRECYCLES_PIDS  -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
> -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fwrapv
> uname output: Linux appsrv01.js.local 2.6.32-358.6.1.el6.x86_64 #1 SMP Tue
> Apr 23 19:29:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-redhat-linux-gnu
>
> Bash Version: 4.1
> Patch Level: 2
> Release Status: release
>
> Description:
>
> Reproducible from both an SSH session as well as directly at the console.
>
> On BASH 4.1.x (4.1.2) running under CentOS 6.x (6.4 Final) and MySQL 5.1.x
> (5.1.69). I believe this bug will persist on all distros running BASH
4.x.x
>
> After running the chained command (see below "Repeat-By" section), BASH
> allows a password field to be seen in Clear Text, and then the BASH
session
> breaks until BASH session is restarted (logout then login).
>
> The purpose of the command is to dump the database "somedb" ... which
would
> normally dump to a text file for import later... but instead redirect
> stdout to the stdin of the chained mysql command which will import all the
> data from "somedb" into "someotherdb" on the same MySQL host. The command
> works, but there's two problems.
>
> MySQL correctly challenges for password of "someuser" to perform the
> mysqldump part, but once you type in the password and hit ENTER, it skips
> to a new blank line without the shell prompt and just sits. It is waiting
> for you to type in the password for "someuser" as the second part of the
> command (but does not prompt for this and it's not intuitive, it appears
> as-if the command is running)... If you type, it's in clear text!
> Potentially a major security issue there.
>
> It gets worse...
>
> After you hit ENTER a second time, the command will finish, and it will
> return a fresh line with the shell prompt. Everything looks normal... but
> try typing. Nothing will show at all, however it is sending the keys to
the
> shell and will execute commands if you type them in and hit ENTER. Each
> successful command will return you to a fresh shell line, but same thing
> happens until you log out and back in (to restart BASH). Also, while this
> is happening, you can hit the ENTER key over and over and BASH will just
> keep repeating the shell prompt on the same line.
>
> Repeat-By:
>
> At the shell, issue the command:
>
> ~]# mysqldump -u someuser -p somedb | mysql -u someuser -p -D someotherdb
>
> Shouldn't need to run that command as root, but the mysql user must be
> privileged enough to work with the two databases. To simplify things you
> can replace "someuser" with root.
>
> Thank you,
>
> Jason Sipula
> address@hidden

What does this have to do with bash? This is almost certainly an issue with
your terminal it MySQL client. What about this would constitute a bash bug?


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