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Author Topic: Bash bug  (Read 1816 times)
linelec (OP)
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September 25, 2014, 03:44:43 PM
 #1

~$  env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
vulnerable
this is a test




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September 25, 2014, 03:55:14 PM
 #2

Oui sympatique cette faille.. quelques exemples :

https://twitter.com/cnbrkbolat/status/514889775724363776 <-- privilege escalation via VMWare sous OS X

https://gist.github.com/anonymous/929d622f3b36b00c0be1 <-- surement un trojan / logiciel malveillant (l'idée est de le dl un fichier et de l'exécuter)

linelec (OP)
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September 26, 2014, 11:41:50 AM
 #3

Oui sympatique cette faille.. quelques exemples :

https://twitter.com/cnbrkbolat/status/514889775724363776 <-- privilege escalation via VMWare sous OS X

https://gist.github.com/anonymous/929d622f3b36b00c0be1 <-- surement un trojan / logiciel malveillant (l'idée est de le dl un fichier et de l'exécuter)


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Could the Bash bug cause an internet MELTDOWN?
Hackers scramble to exploit Shellshock flaw as experts warn your details may be at risk


http://www.dailymail.co.uk/sciencetech/article-2770512/Could-Bash-bug-cause-internet-MELTDOWN-Hackers-scramble-exploit-Shellshock-flaw-experts-warn-details-risk.html


kcud_dab
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September 26, 2014, 11:59:06 AM
 #4

Un autre ex d'exploit

https://www.trustedsec.com/september-2014/shellshock-dhcp-rce-proof-concept/ <-- attaque via un DHCPd sur un réseau local

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September 26, 2014, 01:29:19 PM
 #5

http://stackoverflow.com/questions/26037618/how-to-get-a-php-variable-from-one-file-to-another-maybe-using-jquery-javascript

Tapez dans le shell :

Code:
env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

Si vous voyez :

Code:
vulnerable

Corrigez la faille (Ubuntu/Mint/ElementaryOs):

Code:
sudo apt-get update

sudo apt-get install --only-upgrade bash

Pour Debian :

Code:
mkdir src
cd src
wget http://ftp.gnu.org/gnu/bash/bash-4.3.tar.gz
#download all patches
for i in $(seq -f "%03g" 0 25); do wget http://ftp.gnu.org/gnu/bash/bash-4.3-patches/bash43-$i; done
tar zxvf bash-4.3.tar.gz
cd bash-4.3
#apply all patches
for i in $(seq -f "%03g" 0 25);do patch -p0 < ../bash43-$i; done #build and install
./configure && make && make install
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December 10, 2014, 12:01:56 PM
 #6

Un lien, peu de texte explicatif, attention, ton post va se faire deleter par kcud_dab.
Son argument pour effacer les miens, c'est un seul lien et très peu de texte explicatif

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December 10, 2014, 12:59:00 PM
 #7

Un lien, peu de texte explicatif, attention, ton post va se faire deleter par kcud_dab.
Son argument pour effacer les miens, c'est un seul lien et très peu de texte explicatif


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