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ymgve/vgaloader-angr-solver.py

Last active November 19, 2017 12:24
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vgaloader-angr-solver.py
import angr
proj = angr.Project('./vgaloader.elf')
state = proj.factory.entry_state()
simgr = proj.factory.simgr(state)
simgr.explore(find=0x000B8F9F)
print repr(simgr.found[0].posix.dumps(0))
Raw
vgaloader.c
#include <sys/mman.h>
#include <string.h>
unsigned char vgamem[] = {
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0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4, 0xdf, 0xf4,
0xdf, 0xf4, 0xdf, 0xf4
};
void main() {
unsigned char flag[64];
mmap((void*)0xb6000, 0x3000, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
memcpy((void*)0xb8000, vgamem, sizeof(vgamem));
read(0, flag, 64);
memcpy((void*)0xb7000, flag, sizeof(flag));
asm ("mov $0xb8000, %ebp\n\t mov %ebp, %eax\n\t mov $0xb7000, %esp\n\t jmp %ebp");
}
Raw
vgaparser.py
from PIL import Image
im = Image.open("vga.png")
trans = [5, 3, 9, 14, 7, 6, 2, 11, 0, 15, 1, 12, 4, 10, 8, 13]
xs, ys = im.size
xsplits = set()
xsplits.add(0)
for y in xrange(ys):
for x in xrange(xs-1):
if im.getpixel((x, y)) != im.getpixel((x+1, y)):
xsplits.add(x+1)
ysplits = set()
ysplits.add(0)
for x in xrange(xs):
for y in xrange(ys-1):
if im.getpixel((x, y)) != im.getpixel((x, y+1)):
ysplits.add(y+1)
xsplits = sorted(xsplits)
ysplits = sorted(ysplits)
s = ""
for y in xrange(0, len(ysplits), 2):
for x in xrange(len(xsplits)):
a = im.getpixel((xsplits[x], ysplits[y]))
b = im.getpixel((xsplits[x], ysplits[y+1]))
t = (trans[b] << 4) | trans[a]
s += chr(223)
s += chr(t)
print repr(s)
print len(xsplits)
print len(ysplits)
open("vgaloader.bin", "wb").write(s)
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