afl-first-try
This commit is contained in:
parent
1d0b468907
commit
d82e7ba65f
@ -268,9 +268,9 @@ operation),也不是一个针对任何特定理论的概念验证(proof of con
|
|||||||
在编译过的程序中插桩能够捕获分支(边缘)的覆盖率,并且还能检测到粗略的分支执行命中次数(branch-taken hit counts)。在分支点注入的代码大致如下:
|
在编译过的程序中插桩能够捕获分支(边缘)的覆盖率,并且还能检测到粗略的分支执行命中次数(branch-taken hit counts)。在分支点注入的代码大致如下:
|
||||||
|
|
||||||
```
|
```
|
||||||
cur_location = <COMPILE_TIME_RANDOM>;
|
cur_location = <COMPILE_TIME_RANDOM>; //用一个随机数标记当前基本块
|
||||||
shared_mem[cur_location ^ prev_location]++;
|
shared_mem[cur_location ^ prev_location]++; //将当前块和前一块异或保存到shared_mem[]
|
||||||
prev_location = cur_location >> 1;
|
prev_location = cur_location >> 1; //cur_location右移1位区分从当前块到当前块的转跳
|
||||||
```
|
```
|
||||||
cur_location的值是随机产生的,为的是简化连接复杂对象的过程和保持XOR输出分布是均匀的。
|
cur_location的值是随机产生的,为的是简化连接复杂对象的过程和保持XOR输出分布是均匀的。
|
||||||
shared_mem[] 数组是一个调用者 (caller) 传给被插桩的二进制程序的64kB的共享空间。其中的每一字节可以理解成对于插桩代码中特别的元组(branch_src, branch_dst)的一次命中(hit)。
|
shared_mem[] 数组是一个调用者 (caller) 传给被插桩的二进制程序的64kB的共享空间。其中的每一字节可以理解成对于插桩代码中特别的元组(branch_src, branch_dst)的一次命中(hit)。
|
||||||
@ -290,7 +290,7 @@ shared_mem[] 数组是一个调用者 (caller) 传给被插桩的二进制程序
|
|||||||
> A -> B -> D -> C -> E (tuples: AB, BD, DC, CE)
|
> A -> B -> D -> C -> E (tuples: AB, BD, DC, CE)
|
||||||
>
|
>
|
||||||
这有助于发现底层代码的微小错误条件。因为安全漏洞通常是一些非预期(或不正确)的语句转移(一个tuple就是一个语句转移),而不是没覆盖到某块代码。
|
这有助于发现底层代码的微小错误条件。因为安全漏洞通常是一些非预期(或不正确)的语句转移(一个tuple就是一个语句转移),而不是没覆盖到某块代码。
|
||||||
上边伪代码的最后一行移位操作是为了让tuple具有定向性(没有这一行的话,A^B和B^A就没区别了,同样,A^A和B^B也没区别了)。采用左移的原因跟Intel CPU的一些特性有关。
|
上边伪代码的最后一行移位操作是为了让tuple具有定向性(没有这一行的话,A^B和B^A就没区别了,同样,A^A和B^B也没区别了)。采用右移的原因跟Intel CPU的一些特性有关。
|
||||||
|
|
||||||
## 2)发现新路径(Detecting new behaviors)
|
## 2)发现新路径(Detecting new behaviors)
|
||||||
AFL的fuzzers使用一个**全局Map**来存储之前执行时看到的tuple。这些数据可以被用来对不同的trace进行快速对比,从而可以计算出是否新执行了一个dword指令/一个qword-wide指令/一个简单的循环。
|
AFL的fuzzers使用一个**全局Map**来存储之前执行时看到的tuple。这些数据可以被用来对不同的trace进行快速对比,从而可以计算出是否新执行了一个dword指令/一个qword-wide指令/一个简单的循环。
|
||||||
|
390
source/_posts/afl-first-try.md
Normal file
390
source/_posts/afl-first-try.md
Normal file
@ -0,0 +1,390 @@
|
|||||||
|
---
|
||||||
|
title: AFL初次实践
|
||||||
|
date: 2019-07-09 14:46:07
|
||||||
|
tags:
|
||||||
|
- AFL
|
||||||
|
- 模糊测试
|
||||||
|
categories: 二进制
|
||||||
|
---
|
||||||
|
|
||||||
|
这篇文章是对afl的简单使用,可大致分为黑盒测试和白盒测试两个部分。白盒测试从对目标程序的插桩编译开始,然后使用fuzzer对其模糊测试发现崩溃,最后对测试的代码覆盖率进行评估。黑盒测试则演示得较简略。
|
||||||
|
参考:https://paper.seebug.org/841/#_1
|
||||||
|
|
||||||
|
**部署afl**
|
||||||
|
> ```
|
||||||
|
> wget http://lcamtuf.coredump.cx/afl/releases/afl-latest.tgz
|
||||||
|
> tar -zxvf afl-latest.tgz
|
||||||
|
> cd afl-2.52b/
|
||||||
|
> make
|
||||||
|
> sudo make install
|
||||||
|
> ```
|
||||||
|
|
||||||
|
**部署qemu**
|
||||||
|
> ```
|
||||||
|
> $ CPU_TARGET=x86_64 ./build_qemu_support.sh
|
||||||
|
> [+] Build process successful!
|
||||||
|
> [*] Copying binary...
|
||||||
|
> -rwxr-xr-x 1 han han 10972920 7月 9 10:43 ../afl-qemu-trace
|
||||||
|
> [+] Successfully created '../afl-qemu-trace'.
|
||||||
|
> [!] Note: can't test instrumentation when CPU_TARGET set.
|
||||||
|
> [+] All set, you can now (hopefully) use the -Q mode in afl-fuzz!
|
||||||
|
> ```
|
||||||
|
|
||||||
|
-------------
|
||||||
|
|
||||||
|
# 白盒测试
|
||||||
|
## 目标程序编译
|
||||||
|
1. 源代码
|
||||||
|
```
|
||||||
|
#undef _FORTIFY_SOURCE
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
|
||||||
|
void vulnerable_function() {
|
||||||
|
char buf[128];
|
||||||
|
read(STDIN_FILENO, buf, 256);
|
||||||
|
}
|
||||||
|
|
||||||
|
int main(int argc, char** argv) {
|
||||||
|
vulnerable_function();
|
||||||
|
write(STDOUT_FILENO, "Hello, World\n", 13);
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
2. gcc编译(不插桩)
|
||||||
|
```-fprofile-arcs -ftest-coverage
|
||||||
|
$ gcc v1.c -o v1
|
||||||
|
$ ./v1
|
||||||
|
what
|
||||||
|
Hello, World
|
||||||
|
```
|
||||||
|
生成v1的目的一是为了和afl-gcc的编译做对比,二是为黑盒测试做铺垫。
|
||||||
|
|
||||||
|
3. 使用afl-gcc进行编译
|
||||||
|
*-fno-stack-protector 该选项会禁止stack canary保护
|
||||||
|
-z execstack 允许堆栈可执行*
|
||||||
|
```
|
||||||
|
$ ../afl-2.52b/afl-gcc -fno-stack-protector -z execstack v1.c -o v1-afl
|
||||||
|
afl-cc 2.52b by <lcamtuf@google.com>
|
||||||
|
afl-as 2.52b by <lcamtuf@google.com>
|
||||||
|
[+] Instrumented 2 locations (64-bit, non-hardened mode, ratio 100%).
|
||||||
|
```
|
||||||
|
|
||||||
|
## 测试插桩程序
|
||||||
|
**afl-showmap** 跟踪单个输入的执行路径,并打印程序执行的输出、捕获的元组(tuples),tuple用于获取分支信息,从而衡量衡量程序覆盖情况。
|
||||||
|
```
|
||||||
|
$ ./afl-showmap -o /dev/null -- ../vuln/v1 <<(echo test)
|
||||||
|
afl-showmap 2.52b by <lcamtuf@google.com>
|
||||||
|
[*] Executing '../vuln/v1'...
|
||||||
|
|
||||||
|
-- Program output begins --
|
||||||
|
Hello, World
|
||||||
|
-- Program output ends --
|
||||||
|
|
||||||
|
[-] PROGRAM ABORT : No instrumentation detected
|
||||||
|
Location : main(), afl-showmap.c:773
|
||||||
|
```
|
||||||
|
|
||||||
|
```
|
||||||
|
$ ./afl-showmap -o /dev/null -- ../vuln/v1-afl <<(echo test)
|
||||||
|
afl-showmap 2.52b by <lcamtuf@google.com>
|
||||||
|
[*] Executing '../vuln/v1-afl'...
|
||||||
|
|
||||||
|
-- Program output begins --
|
||||||
|
Hello, World
|
||||||
|
-- Program output ends --
|
||||||
|
[+] Captured 1 tuples in '/dev/null'.
|
||||||
|
```
|
||||||
|
可见,afl-gcc相对于gcc的不同在于采用了插桩计算覆盖率,在这个实例程序中捕捉到了一个元组
|
||||||
|
|
||||||
|
|
||||||
|
## 执行FUZZER
|
||||||
|
1. 修改core
|
||||||
|
在执行afl-fuzz前,如果系统配置为将核心转储文件(core)通知发送到外部程序。
|
||||||
|
```
|
||||||
|
$ ./afl-fuzz -i ../vuln/testcase/ -o ../vuln/out/ ../vuln/v1-afl
|
||||||
|
afl-fuzz 2.52b by <lcamtuf@google.com>
|
||||||
|
[+] You have 2 CPU cores and 2 runnable tasks (utilization: 100%).
|
||||||
|
[*] Checking CPU core loadout...
|
||||||
|
[+] Found a free CPU core, binding to #0.
|
||||||
|
[*] Checking core_pattern...
|
||||||
|
|
||||||
|
[-] Hmm, your system is configured to send core dump notifications to an
|
||||||
|
external utility. This will cause issues: there will be an extended delay
|
||||||
|
between stumbling upon a crash and having this information relayed to the
|
||||||
|
fuzzer via the standard waitpid() API.
|
||||||
|
|
||||||
|
To avoid having crashes misinterpreted as timeouts, please log in as root
|
||||||
|
and temporarily modify /proc/sys/kernel/core_pattern, like so:
|
||||||
|
|
||||||
|
echo core >/proc/sys/kernel/core_pattern
|
||||||
|
|
||||||
|
[-] PROGRAM ABORT : Pipe at the beginning of 'core_pattern'
|
||||||
|
Location : check_crash_handling(), afl-fuzz.c:7275
|
||||||
|
```
|
||||||
|
将导致将崩溃信息发送到Fuzzer之间的延迟增大,进而可能将崩溃被误报为超时,所以我们得临时修改core_pattern文件,如下所示:
|
||||||
|
```
|
||||||
|
echo core >/proc/sys/kernel/core_pattern
|
||||||
|
|
||||||
|
```
|
||||||
|
|
||||||
|
2. 通用fuzz语法
|
||||||
|
afl-fuzz对于直接从stdin接受输入的目标二进制文件,通常的语法是:
|
||||||
|
```
|
||||||
|
$ ./afl-fuzz -i testcase_dir -o findings_dir / path / to / program [... params ...]
|
||||||
|
```
|
||||||
|
对于从文件中获取输入的程序,使用“@@”标记目标命令行中应放置输入文件名的位置。模糊器将替换为您:
|
||||||
|
```
|
||||||
|
$ ./afl-fuzz -i testcase_dir -o findings_dir / path / to / program @@
|
||||||
|
```
|
||||||
|
此时afl会给我们返回一些信息,这里提示我们有些测试用例无效
|
||||||
|
```
|
||||||
|
afl-fuzz 2.52b by <lcamtuf@google.com>
|
||||||
|
[+] You have 2 CPU cores and 2 runnable tasks (utilization: 100%).
|
||||||
|
[*] Checking CPU core loadout...
|
||||||
|
[+] Found a free CPU core, binding to #0.
|
||||||
|
[*] Checking core_pattern...
|
||||||
|
[*] Setting up output directories...
|
||||||
|
[+] Output directory exists but deemed OK to reuse.
|
||||||
|
[*] Deleting old session data...
|
||||||
|
[+] Output dir cleanup successful.
|
||||||
|
[*] Scanning '../vuln/testcase/'...
|
||||||
|
[+] No auto-generated dictionary tokens to reuse.
|
||||||
|
[*] Creating hard links for all input files...
|
||||||
|
[*] Validating target binary...
|
||||||
|
[*] Attempting dry run with 'id:000000,orig:1'...
|
||||||
|
[*] Spinning up the fork server...
|
||||||
|
[+] All right - fork server is up.
|
||||||
|
len = 3, map size = 1, exec speed = 295 us
|
||||||
|
[*] Attempting dry run with 'id:000001,orig:2'...
|
||||||
|
len = 23, map size = 1, exec speed = 125 us
|
||||||
|
[!] WARNING: No new instrumentation output, test case may be useless.
|
||||||
|
[+] All test cases processed.
|
||||||
|
|
||||||
|
[!] WARNING: Some test cases look useless. Consider using a smaller set.
|
||||||
|
[+] Here are some useful stats:
|
||||||
|
|
||||||
|
Test case count : 1 favored, 0 variable, 2 total
|
||||||
|
Bitmap range : 1 to 1 bits (average: 1.00 bits)
|
||||||
|
Exec timing : 125 to 295 us (average: 210 us)
|
||||||
|
|
||||||
|
[*] No -t option specified, so I'll use exec timeout of 20 ms.
|
||||||
|
[+] All set and ready to roll!
|
||||||
|
|
||||||
|
```
|
||||||
|
|
||||||
|
3. 状态窗口
|
||||||
|
我们可以看到afl很快就给我们制造了崩溃
|
||||||
|
|
||||||
|
```
|
||||||
|
american fuzzy lop 2.52b (v1-afl)
|
||||||
|
|
||||||
|
┌─ process timing ─────────────────────────────────────┬─ overall results ─────┐
|
||||||
|
│ run time : 0 days, 0 hrs, 4 min, 19 sec │ cycles done : 2477 │
|
||||||
|
│ last new path : 0 days, 0 hrs, 2 min, 27 sec │ total paths : 3 │
|
||||||
|
│ last uniq crash : 0 days, 0 hrs, 4 min, 19 sec │ uniq crashes : 1 │
|
||||||
|
│ last uniq hang : 0 days, 0 hrs, 2 min, 12 sec │ uniq hangs : 1 │
|
||||||
|
├─ cycle progress ────────────────────┬─ map coverage ─┴───────────────────────┤
|
||||||
|
│ now processing : 2 (66.67%) │ map density : 0.00% / 0.00% │
|
||||||
|
│ paths timed out : 0 (0.00%) │ count coverage : 1.00 bits/tuple │
|
||||||
|
├─ stage progress ────────────────────┼─ findings in depth ────────────────────┤
|
||||||
|
│ now trying : havoc │ favored paths : 1 (33.33%) │
|
||||||
|
│ stage execs : 1433/1536 (93.29%) │ new edges on : 2 (66.67%) │
|
||||||
|
│ total execs : 2.32M │ total crashes : 93.1k (1 unique) │
|
||||||
|
│ exec speed : 0.00/sec (zzzz...) │ total tmouts : 8 (1 unique) │
|
||||||
|
├─ fuzzing strategy yields ───────────┴───────────────┬─ path geometry ────────┤
|
||||||
|
│ bit flips : 0/1152, 0/1149, 0/1143 │ levels : 2 │
|
||||||
|
│ byte flips : 0/144, 0/14, 0/10 │ pending : 0 │
|
||||||
|
│ arithmetics : 0/888, 0/25, 0/0 │ pend fav : 0 │
|
||||||
|
│ known ints : 0/98, 0/390, 0/440 │ own finds : 1 │
|
||||||
|
│ dictionary : 0/0, 0/0, 0/0 │ imported : n/a │
|
||||||
|
│ havoc : 2/1.50M, 0/819k │ stability : 100.00% │
|
||||||
|
│ trim : 11.88%/64, 80.00% ├────────────────────────┘
|
||||||
|
└─────────────────────────────────────────────────────┘ [cpu000:102%] │
|
||||||
|
│ stage execs : 1432/1536 (93.23%) │ new edges on : 2 (66.67%) │
|
||||||
|
+++ Testing aborted by user +++ │ total crashes : 93.1k (1 unique) │
|
||||||
|
[+] We're done here. Have a nice day! │ total tmouts : 8 (1 unique) │
|
||||||
|
├─ fuzzing strategy yields ───────────┴───────────────┬─ path geometry ────────┤
|
||||||
|
|
||||||
|
```
|
||||||
|
由上面AFL状态窗口:
|
||||||
|
① Process timing:Fuzzer运行时长、以及距离最近发现的路径、崩溃和挂起(超时)经过了多长时间。
|
||||||
|
已经运行4m19s,距离上一个最新路径已经过去2min27s,距离上一个独特崩溃已经过去4min19s(可见找到崩溃的速度非常快),距离上一次挂起已经过去2m12s。
|
||||||
|
|
||||||
|
② Overall results:Fuzzer当前状态的概述。
|
||||||
|
|
||||||
|
③ Cycle progress:我们输入队列的距离。队列一共有3个用例,现在是第二个,66.67%
|
||||||
|
|
||||||
|
④ Map coverage:目标二进制文件中的插桩代码所观察到覆盖范围的细节。
|
||||||
|
|
||||||
|
⑤ Stage progress:Fuzzer现在正在执行的文件变异策略、执行次数和执行速度。
|
||||||
|
|
||||||
|
⑥ Findings in depth:有关我们找到的执行路径,异常和挂起数量的信息。
|
||||||
|
|
||||||
|
⑦ Fuzzing strategy yields:关于突变策略产生的最新行为和结果的详细信息。
|
||||||
|
|
||||||
|
⑧ Path geometry:有关Fuzzer找到的执行路径的信息。
|
||||||
|
|
||||||
|
⑨ CPU load:CPU利用率
|
||||||
|
|
||||||
|
## afl何时结束
|
||||||
|
(1) 状态窗口中”cycles done”字段颜色变为绿色该字段的颜色可以作为何时停止测试的参考,随着周期数不断增大,其颜色也会由洋红色,逐步变为黄色、蓝色、绿色。当其变为绿色时,继续Fuzzing下去也很难有新的发现了,这时便可以通过Ctrl-C停止afl-fuzz。
|
||||||
|
(2) 距上一次发现新路径(或者崩溃)已经过去很长时间
|
||||||
|
(3) 目标程序的代码几乎被测试用例完全覆盖
|
||||||
|
|
||||||
|
## 处理输出结果
|
||||||
|
> 确定造成这些crashes的bug是否可以利用,怎么利用?
|
||||||
|
|
||||||
|
afl在fuzzing的过程中同时也产生了这些文件
|
||||||
|
```
|
||||||
|
$ tree ../vuln/out/
|
||||||
|
../vuln/out/
|
||||||
|
├── crashes
|
||||||
|
│ ├── id:000000,sig:11,src:000000,op:havoc,rep:64
|
||||||
|
│ └── README.txt
|
||||||
|
├── fuzz_bitmap
|
||||||
|
├── fuzzer_stats
|
||||||
|
├── hangs
|
||||||
|
├── plot_data
|
||||||
|
└── queue
|
||||||
|
├── id:000000,orig:1
|
||||||
|
└── id:000001,orig:2
|
||||||
|
|
||||||
|
3 directories, 7 files
|
||||||
|
```
|
||||||
|
在输出目录中创建了三个子目录并实时更新:
|
||||||
|
|
||||||
|
* queue: 测试每个独特执行路径的案例,以及用户提供的所有起始文件。
|
||||||
|
* crashes: 导致被测程序接收致命信号的独特测试用例(例如,SIGSEGV,SIGILL,SIGABRT)。条目按接收信号分组。
|
||||||
|
* hangs: 导致测试程序超时的独特测试用例。将某些内容归类为挂起之前的默认时间限制是1秒内的较大值和-t参数的值。可以通过设置AFL_HANG_TMOUT来微调该值,但这很少是必需的。
|
||||||
|
* 崩溃和挂起被视为“唯一” :如果相关的执行路径涉及在先前记录的故障中未见的任何状态转换。如果可以通过多种方式达到单个错误,那么在此过程中会有一些计数通货膨胀,但这应该会迅速逐渐减少。
|
||||||
|
* fuzzer_stats:afl-fuzz的运行状态。
|
||||||
|
* plot_data:用于afl-plot绘图。
|
||||||
|
|
||||||
|
## 崩溃类型和可利用性
|
||||||
|
1. triage_crashes
|
||||||
|
AFL源码的experimental目录中有一个名为triage_crashes.sh的脚本,可以帮助我们触发收集到的crashes。例如下面的例子中,11代表了SIGSEGV信号,有可能是因为缓冲区溢出导致进程引用了无效的内存;06代表了SIGABRT信号,可能是执行了abort\assert函数或double free导致,这些结果可以作为简单的参考。
|
||||||
|
|
||||||
|
```
|
||||||
|
$ experimental/crash_triage/triage_crashes.sh ../vuln/out/ ../vuln/v1-afl 2>&1 | grep SIGNAL
|
||||||
|
+++ ID 000000, SIGNAL 11 +++
|
||||||
|
```
|
||||||
|
2. crashwalk
|
||||||
|
如果你想得到更细致的crashes分类结果,以及导致crashes的具体原因,那么crashwalk就是不错的选择之一。这个工具基于gdb的exploitable插件,安装也相对简单,在ubuntu上,只需要如下几步即可:
|
||||||
|
```
|
||||||
|
$ apt-get install gdb golang
|
||||||
|
$ mkdir tools
|
||||||
|
$ cd tools
|
||||||
|
$ git clone https://github.com/jfoote/exploitable.git
|
||||||
|
$ mkdir go
|
||||||
|
$ export GOPATH=~/tools/go
|
||||||
|
$ export CW_EXPLOITABLE=~/tools/exploitable/exploitable/exploitable.py
|
||||||
|
$ go get -u github.com/bnagy/crashwalk/cmd/...
|
||||||
|
```
|
||||||
|
- [ ] 这部分我好像还没完成
|
||||||
|
|
||||||
|
3. afl-collect
|
||||||
|
```
|
||||||
|
$ afl-collect -d crashes.db -e gdb_script -j 8 -r ../vuln/out/ ../vuln/testcase -- ../vuln/v1-afl
|
||||||
|
|
||||||
|
*** GDB+EXPLOITABLE SCRIPT OUTPUT ***
|
||||||
|
[00001] out:id:000000,sig:11,src:000000,op:havoc,rep:64.................: EXPLOITABLE [ReturnAv (1/22)]
|
||||||
|
*** ***************************** ***
|
||||||
|
```
|
||||||
|
|
||||||
|
-------------
|
||||||
|
|
||||||
|
# 代码覆盖率及其相关概念
|
||||||
|
> 代码覆盖率是模糊测试中一个极其重要的概念,使用代码覆盖率可以评估和改进测试过程,执行到的代码越多,找到bug的可能性就越大,毕竟,在覆盖的代码中并不能100%发现bug,在未覆盖的代码中却是100%找不到任何bug的。
|
||||||
|
> 代码覆盖率是一种度量代码的覆盖程度的方式,也就是指源代码中的某行代码是否已执行;对二进制程序,还可将此概念理解为汇编代码中的某条指令是否已执行。其计量方式很多,但无论是GCC的GCOV还是LLVM的SanitizerCoverage,都提供函数(function)、基本块(basic-block)、边界(edge)三种级别的覆盖率检测。
|
||||||
|
|
||||||
|
## 计算代码覆盖率
|
||||||
|
**GCOV**:插桩生成覆盖率 **LCOV**:图形展示覆盖率 **afl-cov**:调用前两个工具计算afl测试用例的覆盖率
|
||||||
|
|
||||||
|
1. gcc插桩
|
||||||
|
```
|
||||||
|
$ gcc -fprofile-arcs -ftest-coverage ./v1.c -o v1-cov
|
||||||
|
```
|
||||||
|
|
||||||
|
2. afl-cov计算之前fuzzer的过程(结束后)
|
||||||
|
```
|
||||||
|
$ ../afl-2.52b/afl-cov/afl-cov -d ./out/ --enable-branch-coverage -c . -e "cat AFL_FILE | ./v1-cov AFL_FILE"
|
||||||
|
|
||||||
|
Non-zero exit status '1' for CMD: /usr/bin/readelf -a cat
|
||||||
|
|
||||||
|
*** Imported 2 new test cases from: ./out//queue
|
||||||
|
|
||||||
|
[+] AFL test case: id:000000,orig:1 (0 / 2), cycle: 0
|
||||||
|
lines......: 100.0% (6 of 6 lines)
|
||||||
|
functions..: 100.0% (2 of 2 functions)
|
||||||
|
branches...: no data found
|
||||||
|
|
||||||
|
Coverage diff (init) id:000000,orig:1
|
||||||
|
diff (init) -> id:000000,orig:1
|
||||||
|
New src file: /home/han/ck/vuln/v1.c
|
||||||
|
New 'function' coverage: main()
|
||||||
|
New 'function' coverage: vulnerable_function()
|
||||||
|
New 'line' coverage: 11
|
||||||
|
New 'line' coverage: 12
|
||||||
|
New 'line' coverage: 13
|
||||||
|
New 'line' coverage: 6
|
||||||
|
New 'line' coverage: 8
|
||||||
|
New 'line' coverage: 9
|
||||||
|
|
||||||
|
++++++ BEGIN - first exec output for CMD: cat ./out//queue/id:000000,orig:1 | ./v1-cov ./out//queue/id:000000,orig:1
|
||||||
|
Hello, World
|
||||||
|
++++++ END
|
||||||
|
|
||||||
|
[+] AFL test case: id:000001,orig:2 (1 / 2), cycle: 0
|
||||||
|
lines......: 100.0% (6 of 6 lines)
|
||||||
|
functions..: 100.0% (2 of 2 functions)
|
||||||
|
branches...: no data found
|
||||||
|
[+] Processed 2 / 2 test cases.
|
||||||
|
|
||||||
|
[+] Final zero coverage report: ./out//cov/zero-cov
|
||||||
|
[+] Final positive coverage report: ./out//cov/pos-cov
|
||||||
|
lines......: 100.0% (6 of 6 lines)
|
||||||
|
functions..: 100.0% (2 of 2 functions)
|
||||||
|
branches...: no data found
|
||||||
|
[+] Final lcov web report: ./out//cov/web/index.html
|
||||||
|
```
|
||||||
|
3. LCOV展示
|
||||||
|
|
||||||
|
![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1562570048/afl/1.png)
|
||||||
|
|
||||||
|
|
||||||
|
------------------
|
||||||
|
|
||||||
|
# 黑盒测试(使用qemu
|
||||||
|
|
||||||
|
```
|
||||||
|
$ ./afl-fuzz -i ../vuln/testcase/ -o ../vuln/outQemu -Q ../vuln/v1
|
||||||
|
american fuzzy lop 2.52b (v1)
|
||||||
|
|
||||||
|
┌─ process timing ─────────────────────────────────────┬─ overall results ─────┐
|
||||||
|
│ run time : 0 days, 0 hrs, 0 min, 41 sec │ cycles done : 232 │
|
||||||
|
│ last new path : none yet (odd, check syntax!) │ total paths : 2 │
|
||||||
|
│ last uniq crash : 0 days, 0 hrs, 0 min, 41 sec │ uniq crashes : 1 │
|
||||||
|
│ last uniq hang : none seen yet │ uniq hangs : 0 │
|
||||||
|
├─ cycle progress ────────────────────┬─ map coverage ─┴───────────────────────┤
|
||||||
|
│ now processing : 0* (0.00%) │ map density : 0.04% / 0.04% │
|
||||||
|
│ paths timed out : 0 (0.00%) │ count coverage : 1.00 bits/tuple │
|
||||||
|
├─ stage progress ────────────────────┼─ findings in depth ────────────────────┤
|
||||||
|
│ now trying : havoc │ favored paths : 1 (50.00%) │
|
||||||
|
│ stage execs : 255/256 (99.61%) │ new edges on : 1 (50.00%) │
|
||||||
|
│ total execs : 121k │ total crashes : 33 (1 unique) │
|
||||||
|
│ exec speed : 2860/sec │ total tmouts : 0 (0 unique) │
|
||||||
|
├─ fuzzing strategy yields ───────────┴───────────────┬─ path geometry ────────┤
|
||||||
|
│ bit flips : 0/56, 0/54, 0/50 │ levels : 1 │
|
||||||
|
│ byte flips : 0/7, 0/5, 0/1 │ pending : 0 │
|
||||||
|
│ arithmetics : 0/392, 0/25, 0/0 │ pend fav : 0 │
|
||||||
|
│ known ints : 0/36, 0/138, 0/44 │ own finds : 0 │
|
||||||
|
│ dictionary : 0/0, 0/0, 0/0 │ imported : n/a │
|
||||||
|
│ havoc : 1/120k, 0/0 │ stability : 100.00% │
|
||||||
|
│ trim : 82.61%/5, 0.00% ├────────────────────────┘
|
||||||
|
^C────────────────────────────────────────────────────┘ [cpu000:102%]
|
||||||
|
|
||||||
|
```
|
||||||
|
|
||||||
|
- [ ] 待完成对黑盒测试原理的分析
|
@ -1,5 +1,5 @@
|
|||||||
---
|
---
|
||||||
title: pack and unpack
|
title: 加壳与脱壳
|
||||||
date: 2019-05-14 11:20:59
|
date: 2019-05-14 11:20:59
|
||||||
tags:
|
tags:
|
||||||
---
|
---
|
||||||
|
@ -28,7 +28,7 @@ comments: false
|
|||||||
> [codeforces](http://codeforces.com/) [leetcode](https://leetcode-cn.com/)
|
> [codeforces](http://codeforces.com/) [leetcode](https://leetcode-cn.com/)
|
||||||
|
|
||||||
## 工具
|
## 工具
|
||||||
> [mitmproxy](https://mitmproxy.org/) [msfvenom](https://www.offensive-security.com/metasploit-unleashed/msfvenom/) [shellphish](https://github.com/shellphish) [KALItools](https://tools.kali.org/)
|
> [mitmproxy](https://mitmproxy.org/) [msfvenom](https://www.offensive-security.com/metasploit-unleashed/msfvenom/) [shellphish](https://github.com/shellphish) [KALItools](https://tools.kali.org/) [valgrind-内存泄露扫描利器](http://www.valgrind.org/)
|
||||||
|
|
||||||
## 资源下载
|
## 资源下载
|
||||||
> [Emoji表情](https://emojipedia.org/) [Apk镜像](https://www.apkmirror.com/)
|
> [Emoji表情](https://emojipedia.org/) [Apk镜像](https://www.apkmirror.com/)
|
||||||
|
@ -7,8 +7,8 @@
|
|||||||
<script src="https://aimingoo.github.io/gitmint/dist/gitmint.browser.js"></script>
|
<script src="https://aimingoo.github.io/gitmint/dist/gitmint.browser.js"></script>
|
||||||
{% else %}
|
{% else %}
|
||||||
{% set CommentsClass = "Gitment" %}
|
{% set CommentsClass = "Gitment" %}
|
||||||
<link rel="stylesheet" href="https://imsun.github.io/gitment/style/default.css">
|
<link rel="stylesheet" href="https://jjeejj.github.io/css/gitment.css">
|
||||||
<script src="https://imsun.github.io/gitment/dist/gitment.browser.js"></script>
|
<script src="https://jjeejj.github.io/js/gitment.js"></script>
|
||||||
{% endif %}
|
{% endif %}
|
||||||
<!-- END LOCAL -->
|
<!-- END LOCAL -->
|
||||||
|
|
||||||
|
Loading…
Reference in New Issue
Block a user