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# 1.6.3 流密码
- [流密码概述](#流密码概述)
- [参考资料](#参考资料)
## 流密码概述
## 参考资料
- [Stream cipher](https://en.wikipedia.org/wiki/Stream_cipher)

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# 1.6.4 分组密码
- [分组密码概述](#分组密码概述)
- [Feistel 密码结构](#feistel-密码结构)
- [数据加密标准](#数据加密标准)
- [DES](#des)
- [3DES](#3des)
- [高级加密标准](#高级加密标准)
- [分组密码工作模式](#分组密码工作模式)
- [电子密码本模式](#电子密码本模式)
- [密码分组链接模式](#密码分组链接模式)
- [密码反馈模式](#密码反馈模式)
- [输出反馈模式](#输出反馈模式)
- [计数器模式](#计数器模式)
- [参考资料](#参考资料)
## 分组密码概述
#### Feistel 密码结构
## 数据加密标准
#### DES
#### 3DES
## 高级加密标准
## 分组密码工作模式
#### 电子密码本模式
#### 密码分组链接模式
#### 密码反馈模式
#### 输出反馈模式
#### 计数器模式
## 参考资料
- [Block cipher](https://en.wikipedia.org/wiki/Block_cipher)
- [Data Encryption Standard](https://en.wikipedia.org/wiki/Data_Encryption_Standard)
- [Advanced Encryption Standard](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard)
- [Block cipher mode of operation](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation)

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# 1.6.5 公钥密码
- [参考资料](#参考资料)
- [RSA](#rsa)
## RSA
## 参考资料
- [Public-key cryptography](https://en.wikipedia.org/wiki/Public-key_cryptography)
- [RSA (cryptosystem)](https://en.wikipedia.org/wiki/RSA_(cryptosystem))

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# 1.6.6 哈希函数
- [参考资料](#参考资料)
## 参考资料
- [Hash function](https://en.wikipedia.org/wiki/Hash_function)

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# 1.6.7 数字签名
- [参考资料](#参考资料)
## 参考资料
- [Digital signature](https://en.wikipedia.org/wiki/Digital_signature)

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# 6.1.9 pwn RHme3 Exploitation
- [题目复现](#题目复现)
- [题目解析](#题目解析)
- [参考资料](#参考资料)
[下载文件](../src/writeup/6.1.9_rhme3_exploitation)
## 题目复现
这个题目给出了二进制文件和 libc。
```
$ file main.bin
main.bin: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=ec9db5ec0b8ad99b3b9b1b3b57e5536d1c615c8e, not stripped
$ checksec -f main.bin
RELRO STACK CANARY NX PIE RPATH RUNPATH FORTIFY Fortified Fortifiable FILE
Partial RELRO Canary found NX enabled No PIE No RPATH No RUNPATH Yes 0 10 main.bin
```
64 位程序,保护措施除了 PIE 都开启了。
## 题目解析
玩一下,一看就是堆利用的题目:
```
$ file main.elf
main.elf: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=ec9db5ec0b8ad99b3b9b1b3b57e5536d1c615c8e, not stripped
$ ./main.elf
Welcome to your TeamManager (TM)!
0.- Exit
1.- Add player
2.- Remove player
3.- Select player
4.- Edit player
5.- Show player
6.- Show team
Your choice:
```
程序就是添加、删除、编辑和显示球员信息。但要注意的是在编辑和显示球员前,需要先选择球员,这一点很重要。
添加两个球员看看:
```
$ checksec -f main.elf
RELRO STACK CANARY NX PIE RPATH RUNPATH FORTIFY Fortified Fortifiable FILE
Partial RELRO Canary found NX enabled No PIE No RPATH No RUNPATH Yes 0 10 main.elf
Your choice: 1
Found free slot: 0
Enter player name: aaaa
Enter attack points: 1
Enter defense points: 2
Enter speed: 3
Enter precision: 4
0.- Exit
1.- Add player
2.- Remove player
3.- Select player
4.- Edit player
5.- Show player
6.- Show team
Your choice: 1
Found free slot: 1
Enter player name: bbbb
Enter attack points: 5
Enter defense points: 6
Enter speed: 7
Enter precision: 8
```
试着选中第一个球员,然后删除它:
```
Your choice: 3
Enter index: 0
Player selected!
Name: aaaa
A/D/S/P: 1,2,3,4
0.- Exit
1.- Add player
2.- Remove player
3.- Select player
4.- Edit player
5.- Show player
6.- Show team
Your choice: 2
Enter index: 0
She's gone!
```
接下来直接显示该球员信息:
```
Your choice: 5
Name:
A/D/S/P: 29082240,0,3,4
0.- Exit
1.- Add player
2.- Remove player
3.- Select player
4.- Edit player
5.- Show player
6.- Show team
Your choice: 6
Your team:
Player 0
Name: bbbb
A/D/S/P: 5,6,7,8
```
奇怪的事情发生了,程序没有提醒我们球员不存在,而是直接读取了内存中的信息。
于是我们猜测,程序在 free 球员时没有将 select 的值置空,导致了 use-after-free 的问题。关于 UAF 已经在前面的章节中讲过了。
#### Exploit
完整的 exp 如下:
```python
```

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socat tcp4-listen:10001,reuseaddr,fork exec:"env LD_PRELOAD=libc.so.6 ./main.elf" &