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cat.asm
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cat.asm
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<%
from pwnlib import shellcraft
%>
<%page args="filename, fd=1"/>
<%docstring>
Opens a file and writes its contents to the specified file descriptor.
Example:
>>> write('flag', 'This is the flag\n')
>>> shellcode = shellcraft.cat('flag') + shellcraft.exit(0)
>>> print disasm(asm(shellcode))
0: d28d8cce mov x14, #0x6c66 // #27750
4: f2acec2e movk x14, #0x6761, lsl #16
8: f81f0fee str x14, [sp, #-16]!
c: d29ff380 mov x0, #0xff9c // #65436
10: f2bfffe0 movk x0, #0xffff, lsl #16
14: f2dfffe0 movk x0, #0xffff, lsl #32
18: f2ffffe0 movk x0, #0xffff, lsl #48
1c: 910003e1 mov x1, sp
20: aa1f03e2 mov x2, xzr
24: aa1f03e3 mov x3, xzr
28: d2800708 mov x8, #0x38 // #56
2c: d4000001 svc #0x0
30: aa0003e1 mov x1, x0
34: d2800020 mov x0, #0x1 // #1
38: aa1f03e2 mov x2, xzr
3c: d29fffe3 mov x3, #0xffff // #65535
40: f2afffe3 movk x3, #0x7fff, lsl #16
44: d28008e8 mov x8, #0x47 // #71
48: d4000001 svc #0x0
4c: aa1f03e0 mov x0, xzr
50: d2800ba8 mov x8, #0x5d // #93
54: d4000001 svc #0x0
>>> run_assembly(shellcode).recvline()
'This is the flag\n'
</%docstring>
<%
if fd == 'x0':
raise Exception("File descriptor cannot be x0, it will be overwritten")
%>
${shellcraft.open(filename)}
${shellcraft.syscall('SYS_sendfile', fd, 'x0', 0, 0x7fffffff)}