如何将\x00作为参数传递给程序? [英] How to pass \x00 as argument to program?
问题描述
我有一个小程序,希望将shellcode作为参数传递。在shellcode中,必须传递\x00。我尝试了以下命令:
I have a small program where I wish to pass shellcode as argument. In the shellcode, there is a necessity to pass \x00. I tried the following command:
./program `python -c 'print "\x01\x00\x00\x00\x9c\xd8\xff\xbf"'`
但是the x00根本没有注册!传递给程序的参数是 \x01\x9c\xff\xbf。
But the \x00 doesn't get registered at all! The arguments passed to the program are "\x01\x9c\xff\xbf".
我不认为这是python的问题,而是与传递参数的外壳。我正在使用bash外壳。
I don't think it's a problem with python, but rather with the shell which passes the argument. I am using the bash shell.
现在,如何强制外壳传递参数'\x00'?
Now, how do I force the shell to pass the argument '\x00'?
感谢和问候,
赫里希克什·穆拉利(Hrishikesh Murali)
Thanks and Regards,
Hrishikesh Murali
推荐答案
如果使用<$ c进行检查$ c> wc ,您会发现确实传递了NUL字符:
If you check with wc
, you'll find that the NUL character is indeed passed:
$ python -c 'print "\x00"' | wc -c
2
要摆脱结尾的换行符:
$ python -c 'import sys; sys.stdout.write("\x00")' | wc -c
1
该数据 传递给了脚本,但是问题是 NUL不能成为变量值的一部分。
This data is passed to the script, but the problem is that NUL can not be part of a variable value.
要了解如何操作,请尝试将其传递给脚本:
To see how, try to pass this to a script:
$ cat test.sh
#!/usr/bin/env bash
echo ${#1}
$ ./test.sh "$(python -c 'import sys; sys.stdout.write("\x00")')"
0
已消失。但是有一种节省时间的方法-使用重定向或管道从标准输入中读取:
Gone. But there's a way to save the day - Read from standard input, using either redirection or a pipe:
$ cat test2.sh
#!/usr/bin/env bash
wc -c
$ ./test2.sh < <(python -c 'import sys; sys.stdout.write("\x00")')
1
$ python -c 'import sys; sys.stdout.write("\x00")' | ./test2.sh
1
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