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Groups > comp.os.linux.networking > #3080 > unrolled thread
| Started by | Ger Robertson <something@something.invalid> |
|---|---|
| First post | 2014-09-26 05:44 +0000 |
| Last post | 2014-09-27 02:23 -0600 |
| Articles | 20 on this page of 26 — 13 participants |
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Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Ger Robertson <something@something.invalid> - 2014-09-26 05:44 +0000
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Chris Ahlstrom <OFeem1987@teleworm.us> - 2014-09-26 05:53 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? John Hasler <jhasler@newsguy.com> - 2014-09-26 07:51 -0500
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Caver1 <Caver1@inthemud.org> - 2014-09-26 12:26 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Caver1 <Caver1@inthemud.org> - 2014-09-26 12:40 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Java Jive <java@evij.com.invalid> - 2014-09-26 20:00 +0100
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Caver1 <Caver1@inthemud.org> - 2014-09-27 18:52 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? alexd <troffasky@hotmail.com> - 2014-10-03 20:53 +0100
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Thad Floryan <thad@thadlabs.com> - 2014-10-03 13:33 -0700
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? John Hasler <jhasler@newsguy.com> - 2014-10-03 15:51 -0500
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Thad Floryan <thad@thadlabs.com> - 2014-10-03 21:01 -0700
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Shadow <Sh@dow.br> - 2014-09-26 18:16 -0300
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? William Unruh <unruh@invalid.ca> - 2014-09-26 23:18 +0000
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Shadow <Sh@dow.br> - 2014-09-26 20:33 -0300
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Wildman <best_lay@yahoo.com> - 2014-09-26 19:10 -0500
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? William Unruh <unruh@invalid.ca> - 2014-09-27 01:41 +0000
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Shadow <Sh@dow.br> - 2014-09-26 23:29 -0300
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Michael Black <et472@ncf.ca> - 2014-09-28 20:37 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Wildman <best_lay@yahoo.com> - 2014-09-26 22:10 -0500
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Chris Ahlstrom <OFeem1987@teleworm.us> - 2014-09-27 06:42 -0400
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Shadow <Sh@dow.br> - 2014-09-27 08:35 -0300
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Ger Robertson <something@something.invalid> - 2014-09-27 00:06 +0000
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Shadow <Sh@dow.br> - 2014-09-26 23:21 -0300
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? William Unruh <unruh@invalid.ca> - 2014-09-26 23:14 +0000
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? Ant <ant@zimage.comANT> - 2014-09-26 22:47 -0700
Re: Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? nmassello@yahoo.com (Neill Massello) - 2014-09-27 02:23 -0600
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| From | Ger Robertson <something@something.invalid> |
|---|---|
| Date | 2014-09-26 05:44 +0000 |
| Subject | Are our WiFI routers and rooftop radios affected by the Bash Shellshock vulnerability? |
| Message-ID | <m02ugi$rqe$1@news.albasani.net> |
Anyone know how we can tell if our WiFI routers and rooftop radios are affected by the Bash Shellshock vulnerability?
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| From | Chris Ahlstrom <OFeem1987@teleworm.us> |
|---|---|
| Date | 2014-09-26 05:53 -0400 |
| Message-ID | <m03d32$g26$1@dont-email.me> |
| In reply to | #3080 |
Ger Robertson wrote this copyrighted missive and expects royalties: > Anyone know how we can tell if our WiFI routers and rooftop radios are > affected by the Bash Shellshock vulnerability? Shell into it and see! -- In Lowes Crossroads, Delaware, it is a violation of local law for any pilot or passenger to carry an ice cream cone in their pocket while either flying or waiting to board a plane.
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| From | John Hasler <jhasler@newsguy.com> |
|---|---|
| Date | 2014-09-26 07:51 -0500 |
| Message-ID | <87vboa8s07.fsf@thumper.dhh.gt.org> |
| In reply to | #3080 |
> Anyone know how we can tell if our WiFI routers and rooftop radios are > affected by the Bash Shellshock vulnerability? They almost certainly aren't. Bash is unlikely to be installed on embedded systems: too large. They probably use Busybox. Besides, if anyone on the WAN can connect to your router at all it's already broken. Of course, if you are running the manufacturer's firmware it probably has a dozen gaping holes built in anyway... -- John Hasler jhasler@newsguy.com Dancing Horse Hill Elmwood, WI USA
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| From | Caver1 <Caver1@inthemud.org> |
|---|---|
| Date | 2014-09-26 12:26 -0400 |
| Message-ID | <m0443a$105$1@dont-email.me> |
| In reply to | #3082 |
On 09/26/2014 08:51 AM, John Hasler wrote: >> Anyone know how we can tell if our WiFI routers and rooftop radios are >> affected by the Bash Shellshock vulnerability? > > They almost certainly aren't. Bash is unlikely to be installed on > embedded systems: too large. They probably use Busybox. Besides, if > anyone on the WAN can connect to your router at all it's already broken. > Of course, if you are running the manufacturer's firmware it probably > has a dozen gaping holes built in anyway... > Ubuntu with bash scripts is used for many embedded appliances and they are vulnerable. -- Caver1
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| From | Caver1 <Caver1@inthemud.org> |
|---|---|
| Date | 2014-09-26 12:40 -0400 |
| Message-ID | <m044t3$437$1@dont-email.me> |
| In reply to | #3083 |
On 09/26/2014 12:26 PM, Caver1 wrote: > On 09/26/2014 08:51 AM, John Hasler wrote: >>> Anyone know how we can tell if our WiFI routers and rooftop radios are >>> affected by the Bash Shellshock vulnerability? >> >> They almost certainly aren't. Bash is unlikely to be installed on >> embedded systems: too large. They probably use Busybox. Besides, if >> anyone on the WAN can connect to your router at all it's already broken. >> Of course, if you are running the manufacturer's firmware it probably >> has a dozen gaping holes built in anyway... >> > > Ubuntu with bash scripts is used for many embedded appliances and they > are vulnerable. > Here's a link, https://gigaom.com/2014/09/25/the-critical-shellshock-flaw-affects-many-linux-and-apple-systems-heres-what-you-need-to-know/ -- Caver1
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| From | Java Jive <java@evij.com.invalid> |
|---|---|
| Date | 2014-09-26 20:00 +0100 |
| Message-ID | <2mdb2a9vqutlk93g6klr8lf1ttm9ra40n4@4ax.com> |
| In reply to | #3084 |
"The critical Shellshock flaw affects many Linux and Apple systems — here’s what you need to know" But actually tells you nothing really useful at all, just gives as many scary quotes from as many security experts as he could find when writing up his useless FUD. If he was really concerned, he would have found out enough about how best to fix it temporarily until security updates come along. On Fri, 26 Sep 2014 12:40:03 -0400, Caver1 <Caver1@inthemud.org> wrote: > > Here's a link, > > https://gigaom.com/2014/09/25/the-critical-shellshock-flaw-affects-many-linux-and-apple-systems-heres-what-you-need-to-know/ -- ========================================================= Please always reply to ng as the email in this post's header does not exist. Or use a contact address at: http://www.macfh.co.uk/JavaJive/JavaJive.html http://www.macfh.co.uk/Macfarlane/Macfarlane.html
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| From | Caver1 <Caver1@inthemud.org> |
|---|---|
| Date | 2014-09-27 18:52 -0400 |
| Message-ID | <m07f2j$4lr$1@dont-email.me> |
| In reply to | #3085 |
On 09/26/2014 03:00 PM, Java Jive wrote: > "The critical Shellshock flaw affects many Linux and Apple systems — > here’s what you need to know" > > But actually tells you nothing really useful at all, just gives as > many scary quotes from as many security experts as he could find when > writing up his useless FUD. > > If he was really concerned, he would have found out enough about how > best to fix it temporarily until security updates come along. > > On Fri, 26 Sep 2014 12:40:03 -0400, Caver1 <Caver1@inthemud.org> > wrote: >> >> Here's a link, >> >> https://gigaom.com/2014/09/25/the-critical-shellshock-flaw-affects-many-linux-and-apple-systems-heres-what-you-need-to-know/ I agree just pointed this out to show that routers could be affected. -- Caver1
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| From | alexd <troffasky@hotmail.com> |
|---|---|
| Date | 2014-10-03 20:53 +0100 |
| Message-ID | <m0muro$a3c$2@dont-email.me> |
| In reply to | #3083 |
Caver1 (for it is he) wrote: > Ubuntu with bash scripts is used for many embedded appliances and they > are vulnerable. How many embedded appliances are running Ubuntu, again? -- <http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx) 20:52:18 up 33 days, 11:08, 7 users, load average: 0.83, 0.66, 0.56 Any sufficiently advanced incompetence is indistinguishable from malice
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| From | Thad Floryan <thad@thadlabs.com> |
|---|---|
| Date | 2014-10-03 13:33 -0700 |
| Message-ID | <542F081B.3070009@thadlabs.com> |
| In reply to | #3110 |
On 10/3/2014 12:53 PM, alexd wrote:
> Caver1 (for it is he) wrote:
>
>> Ubuntu with bash scripts is used for many embedded appliances and they
>> are vulnerable.
>
> How many embedded appliances are running Ubuntu, again?
Depends on what one will accept as an "embedded" system;
the SheevaPlug definitely qualifies as embedded.
My Sheevaplug servers are fist-sized and the GuruPlug runs
Debian. Quick example (noting the short uptime is due to
having had to replace a UPS battery recently) noting that
root is the only login on such servers:
root@lanserv1:~# date
Fri Oct 3 13:14:40 PDT 2014
root@lanserv1:~# uptime
13:14:42 up 55 days, 22:37, 1 user, load average: 0.19, 0.15, 0.12
root@lanserv1:~# cat /etc/issue
Ubuntu 9.04 \n \l
root@lanserv1:~# ping thadlabs.com # 12 miles away in Milpitas CA
PING thadlabs.com (192.220.75.50) 56(84) bytes of data.
64 bytes from thadlabs.com (192.220.75.50): icmp_seq=1 ttl=53 time=15.7 ms
64 bytes from thadlabs.com (192.220.75.50): icmp_seq=2 ttl=53 time=14.3 ms
64 bytes from thadlabs.com (192.220.75.50): icmp_seq=3 ttl=53 time=15.6 ms
64 bytes from thadlabs.com (192.220.75.50): icmp_seq=4 ttl=53 time=16.3 ms
--- thadlabs.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
rtt min/avg/max/mdev = 14.331/15.527/16.375/0.749 ms
root@lanserv1:~# bash --version
GNU bash, version 3.2.48(1)-release (arm-unknown-linux-gnueabi)
Copyright (C) 2007 Free Software Foundation, Inc.
root@lanserv1:~# uname -a
Linux lanserv1 2.6.22.18 #1 Thu Mar 19 14:46:22 IST 2009 armv5tejl GNU/Linux
root@lanserv1:~#
Note the sizes of the SheevaPlugs and GuruPlug which have been running
here since 2009:
http://thadlabs.com/PIX/SheevaPlug_first.jpg
http://thadlabs.com/PIX/SheevaPlug_underside.jpg
http://thadlabs.com/PIX/SheevaPlug_labelled.jpg
http://thadlabs.com/PIX/SheevaPlug_Webmin.jpg
http://thadlabs.com/PIX/SheevaPlug_GuruPlug.jpg
http://thadlabs.com/PIX/SheevaPlug_CPU_card_top.jpg
http://thadlabs.com/PIX/SheevaPlug_CPU_card_bottom.jpg
These consume only 4 to 5 Watts power per a Kill-A-Watt device
and they have GiGE ports to serve my LAN (DHCP, DNS, and more)
which is all gigabit:
http://thadlabs.com/PIX/ThadLABS_network_demarc.jpg
http://thadlabs.com/FILES/ThadLABS_network_demarc.txt
Thad
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| From | John Hasler <jhasler@newsguy.com> |
|---|---|
| Date | 2014-10-03 15:51 -0500 |
| Message-ID | <87d2a83mia.fsf@thumper.dhh.gt.org> |
| In reply to | #3111 |
Thad Floryan writes: > Depends on what one will accept as an "embedded" system; the > SheevaPlug definitely qualifies as embedded. No it doesn't. It qualifies as a headless server. An embedded system is embedded in another machine such as a car or a radio. -- John Hasler jhasler@newsguy.com Dancing Horse Hill Elmwood, WI USA
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| From | Thad Floryan <thad@thadlabs.com> |
|---|---|
| Date | 2014-10-03 21:01 -0700 |
| Message-ID | <m0nrer$emj$1@dont-email.me> |
| In reply to | #3112 |
On 10/3/2014 1:51 PM, John Hasler wrote:
> Thad Floryan writes:
>> Depends on what one will accept as an "embedded" system; the
>> SheevaPlug definitely qualifies as embedded.
>
> No it doesn't. It qualifies as a headless server. An embedded system
> is embedded in another machine such as a car or a radio.
OK, I'll accept that, and this confirms it:
http://en.wikipedia.org/wiki/Embedded_system
Thanks! Learn something new every day. :-)
Thad
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| From | Shadow <Sh@dow.br> |
|---|---|
| Date | 2014-09-26 18:16 -0300 |
| Message-ID | <cqlb2a9r2vt5s0nnhjf90j3noe4rro4vbv@4ax.com> |
| In reply to | #3080 |
On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson <something@something.invalid> wrote: >Anyone know how we can tell if our WiFI routers and rooftop radios are >affected by the Bash Shellshock vulnerability? Telnet (or Putty) into it and sh will tell you what shell it runs. []'s -- Don't be evil - Google 2004 We have a new policy - Google 2012
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| From | William Unruh <unruh@invalid.ca> |
|---|---|
| Date | 2014-09-26 23:18 +0000 |
| Message-ID | <m04s7o$9uq$3@dont-email.me> |
| In reply to | #3086 |
On 2014-09-26, Shadow <Sh@dow.br> wrote: > On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson ><something@something.invalid> wrote: > >>Anyone know how we can tell if our WiFI routers and rooftop radios are >>affected by the Bash Shellshock vulnerability? > > Telnet (or Putty) into it and > sh > will tell you what shell it runs. > []'s No it will tell you what shell it runs as a replacement for sh. It may have many shells installed. And once you have telneted in, you already have shell access so do not need shell access. The question is whether there are any externally listening programs which use bash and which can be fed "carefully crafted" environment variables from outside.
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| From | Shadow <Sh@dow.br> |
|---|---|
| Date | 2014-09-26 20:33 -0300 |
| Message-ID | <entb2alc3cv7h6k1d8e0r12sg7p534p3di@4ax.com> |
| In reply to | #3088 |
On Fri, 26 Sep 2014 23:18:16 +0000 (UTC), William Unruh <unruh@invalid.ca> wrote: >On 2014-09-26, Shadow <Sh@dow.br> wrote: >> On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson >><something@something.invalid> wrote: >> >>>Anyone know how we can tell if our WiFI routers and rooftop radios are >>>affected by the Bash Shellshock vulnerability? >> >> Telnet (or Putty) into it and >> sh >> will tell you what shell it runs. >> []'s > >No it will tell you what shell it runs as a replacement for sh. It may >have many shells installed. >And once you have telneted in, you already have shell access so do not >need shell access. >The question is whether there are any externally listening programs >which use bash and which can be fed "carefully crafted" environment >variables from outside. #sh BusyBox v1.00 (2012.02.06-00:34+0000) Built-in shell (msh) Enter 'help' for a list of built-in commands. #cat /etc/services Aw, c'mon, it's a start. []'s -- Don't be evil - Google 2004 We have a new policy - Google 2012
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| From | Wildman <best_lay@yahoo.com> |
|---|---|
| Date | 2014-09-26 19:10 -0500 |
| Message-ID | <20140926191052.76d69c3e.best_lay@yahoo.com> |
| In reply to | #3089 |
On Fri, 26 Sep 2014 20:33:10 -0300 Shadow <Sh@dow.br> wrote: > On Fri, 26 Sep 2014 23:18:16 +0000 (UTC), William Unruh > <unruh@invalid.ca> wrote: > > >On 2014-09-26, Shadow <Sh@dow.br> wrote: > >> On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson > >><something@something.invalid> wrote: > >> > >>>Anyone know how we can tell if our WiFI routers and rooftop radios > >>>are affected by the Bash Shellshock vulnerability? > >> > >> Telnet (or Putty) into it and > >> sh > >> will tell you what shell it runs. > >> []'s > > > >No it will tell you what shell it runs as a replacement for sh. It > >may have many shells installed. > >And once you have telneted in, you already have shell access so do > >not need shell access. > >The question is whether there are any externally listening programs > >which use bash and which can be fed "carefully crafted" environment > >variables from outside. > > #sh > > BusyBox v1.00 (2012.02.06-00:34+0000) Built-in shell (msh) > Enter 'help' for a list of built-in commands. > > #cat /etc/services > > Aw, c'mon, it's a start. > []'s To find out what the default shell is, enter this... echo $SHELL If it is bash and there are other shells installed, you can change the default shell. chsh -s /bin/dash or chsh -s /bin/sh or whatever. -- <Wildman> GNU/Linux user #557453 The cow died so I don't need your bull!
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| From | William Unruh <unruh@invalid.ca> |
|---|---|
| Date | 2014-09-27 01:41 +0000 |
| Message-ID | <m054l5$uiv$1@dont-email.me> |
| In reply to | #3091 |
On 2014-09-27, Wildman <best_lay@yahoo.com> wrote: > On Fri, 26 Sep 2014 20:33:10 -0300 > Shadow <Sh@dow.br> wrote: > >> On Fri, 26 Sep 2014 23:18:16 +0000 (UTC), William Unruh >> <unruh@invalid.ca> wrote: >> >> >On 2014-09-26, Shadow <Sh@dow.br> wrote: >> >> On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson >> >><something@something.invalid> wrote: >> >> >> >>>Anyone know how we can tell if our WiFI routers and rooftop radios >> >>>are affected by the Bash Shellshock vulnerability? >> >> >> >> Telnet (or Putty) into it and >> >> sh >> >> will tell you what shell it runs. >> >> []'s >> > >> >No it will tell you what shell it runs as a replacement for sh. It >> >may have many shells installed. >> >And once you have telneted in, you already have shell access so do >> >not need shell access. >> >The question is whether there are any externally listening programs >> >which use bash and which can be fed "carefully crafted" environment >> >variables from outside. >> >> #sh >> >> BusyBox v1.00 (2012.02.06-00:34+0000) Built-in shell (msh) >> Enter 'help' for a list of built-in commands. >> >> #cat /etc/services >> >> Aw, c'mon, it's a start. >> []'s > > To find out what the default shell is, enter this... > echo $SHELL Different default. This is the default for that particular user-- the shell that is opened up on a terminal when the user logs in. The default I was talking about is the default that the system uses in general- it is usually called sh, but most systems have /bin/sh pointing to some other shell which also has the same commands as the classic sh shell (such as bash). Writers expect sh to comply with certain standards so for example /bin/tcsh would not be a good thing for /bin/sh to point to because thestructure of tcsh is very different from the old sh. > If it is bash and there are other shells installed, you can > change the default shell. > chsh -s /bin/dash > or > chsh -s /bin/sh > or whatever. That will change your own particular shell that is brought up when you log in. Actually the latter will probably give you bash anyway, since /bin/sh is often a link to /bin/bash. >
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| From | Shadow <Sh@dow.br> |
|---|---|
| Date | 2014-09-26 23:29 -0300 |
| Message-ID | <4q7c2adt3nub11o9po8pr82h21lm98vkrs@4ax.com> |
| In reply to | #3092 |
On Sat, 27 Sep 2014 01:41:58 +0000 (UTC), William Unruh <unruh@invalid.ca> wrote: >That will change your own particular shell that is brought up when you >log in. Actually the latter will probably give you bash anyway, since >/bin/sh is often a link to /bin/bash. Do you know any cheapo home routers (D-Link, Netgear, etc) that actually use bash, and not BusyBox, or some other compact "do-all" binary ? I know the expensive ones might use it, and the shell on my homemade CD-Booted router/firewall running on an old AMD K6 was bash, but bash is a bit of an overkill for a cheap home router. []'s -- Don't be evil - Google 2004 We have a new policy - Google 2012
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| From | Michael Black <et472@ncf.ca> |
|---|---|
| Date | 2014-09-28 20:37 -0400 |
| Message-ID | <alpine.LNX.2.02.1409282036380.25093@darkstar.example.org> |
| In reply to | #3094 |
On Fri, 26 Sep 2014, Shadow wrote: > On Sat, 27 Sep 2014 01:41:58 +0000 (UTC), William Unruh > <unruh@invalid.ca> wrote: > >> That will change your own particular shell that is brought up when you >> log in. Actually the latter will probably give you bash anyway, since >> /bin/sh is often a link to /bin/bash. > > Do you know any cheapo home routers (D-Link, Netgear, etc) > that actually use bash, and not BusyBox, or some other compact > "do-all" binary ? > I know the expensive ones might use it, and the shell on my > homemade CD-Booted router/firewall running on an old AMD K6 was bash, > but bash is a bit of an overkill for a cheap home router. > []'s Then there are the TV sets (both of mine run Linux, but have no means of connecting to the Internet), and both my blu-ray players run Linux (and they do have ethernet ports). Michael
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| From | Wildman <best_lay@yahoo.com> |
|---|---|
| Date | 2014-09-26 22:10 -0500 |
| Message-ID | <20140926221057.192f5947.best_lay@yahoo.com> |
| In reply to | #3092 |
On Sat, 27 Sep 2014 01:41:58 +0000 (UTC) William Unruh <unruh@invalid.ca> wrote: > On 2014-09-27, Wildman <best_lay@yahoo.com> wrote: > > On Fri, 26 Sep 2014 20:33:10 -0300 > > Shadow <Sh@dow.br> wrote: > > > >> On Fri, 26 Sep 2014 23:18:16 +0000 (UTC), William Unruh > >> <unruh@invalid.ca> wrote: > >> > >> >On 2014-09-26, Shadow <Sh@dow.br> wrote: > >> >> On Fri, 26 Sep 2014 05:44:50 +0000 (UTC), Ger Robertson > >> >><something@something.invalid> wrote: > >> >> > >> >>>Anyone know how we can tell if our WiFI routers and rooftop > >> >>>radios are affected by the Bash Shellshock vulnerability? > >> >> > >> >> Telnet (or Putty) into it and > >> >> sh > >> >> will tell you what shell it runs. > >> >> []'s > >> > > >> >No it will tell you what shell it runs as a replacement for sh. It > >> >may have many shells installed. > >> >And once you have telneted in, you already have shell access so do > >> >not need shell access. > >> >The question is whether there are any externally listening > >> >programs which use bash and which can be fed "carefully crafted" > >> >environment variables from outside. > >> > >> #sh > >> > >> BusyBox v1.00 (2012.02.06-00:34+0000) Built-in shell (msh) > >> Enter 'help' for a list of built-in commands. > >> > >> #cat /etc/services > >> > >> Aw, c'mon, it's a start. > >> []'s > > > > To find out what the default shell is, enter this... > > echo $SHELL > > Different default. This is the default for that particular user-- the > shell that is opened up on a terminal when the user logs in. The > default I was talking about is the default that the system uses in > general- it is usually called sh, but most systems have /bin/sh > pointing to some other shell which also has the same commands as the > classic sh shell (such as bash). Writers expect sh to comply with > certain standards so for example /bin/tcsh would not be a good thing > for /bin/sh to point to because thestructure of tcsh is very > different from the old sh. On a Linux/Unix system that is true. I don't think routers support multiple users or do they? > > If it is bash and there are other shells installed, you can > > change the default shell. > > chsh -s /bin/dash > > or > > chsh -s /bin/sh > > or whatever. > > That will change your own particular shell that is brought up when you > log in. If routers support only one user, that would not be an issue. Even so, it is possible to change the default shell for all users. > Actually the latter will probably give you bash anyway, since > /bin/sh is often a link to /bin/bash. On my system, SolydX, sh points to dash. The same is true for Mint, Ubuntu and MX-14. Don't know about any others. -- <Wildman> GNU/Linux user #557453 The cow died so I don't need your bull!
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| From | Chris Ahlstrom <OFeem1987@teleworm.us> |
|---|---|
| Date | 2014-09-27 06:42 -0400 |
| Message-ID | <m0649r$l78$3@dont-email.me> |
| In reply to | #3095 |
Wildman wrote this copyrighted missive and expects royalties: > On Sat, 27 Sep 2014 01:41:58 +0000 (UTC) > William Unruh <unruh@invalid.ca> wrote: > >> > >> > To find out what the default shell is, enter this... >> > echo $SHELL >> >> Different default. This is the default for that particular user-- the >> shell that is opened up on a terminal when the user logs in. The >> default I was talking about is the default that the system uses in >> general- it is usually called sh, but most systems have /bin/sh >> pointing to some other shell which also has the same commands as the >> classic sh shell (such as bash). Writers expect sh to comply with >> certain standards so for example /bin/tcsh would not be a good thing >> for /bin/sh to point to because thestructure of tcsh is very >> different from the old sh. > > On a Linux/Unix system that is true. I don't think routers > support multiple users or do they? > >> > If it is bash and there are other shells installed, you can >> > change the default shell. >> > chsh -s /bin/dash >> > or >> > chsh -s /bin/sh >> > or whatever. >> >> That will change your own particular shell that is brought up when you >> log in. > > If routers support only one user, that would not be an issue. > Even so, it is possible to change the default shell for all > users. > >> Actually the latter will probably give you bash anyway, since >> /bin/sh is often a link to /bin/bash. > > On my system, SolydX, sh points to dash. The same is true > for Mint, Ubuntu and MX-14. Don't know about any others. That's long been true for Debian, I believe. It is certainly true right now. -- A man can have two, maybe three love affairs while he's married. After that it's cheating. -- Yves Montand
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