ASLR_DEP_BitNX

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Protection ASLR, Bit NX, DEP, SafeSEH, Kernel patches and Safe coding

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# ASLR_DEP_BitNX
Protection ASLR, Bit NX, DEP, SafeSEH, Kernel patches and Safe coding

## protection methods
* ASLR : Adress Space Layout Randomization
* Bit NX : memory page "not executable"
* DEP (Data execution prevention), SafeSEH, Kernel patches
* Safe coding

# ASLR
<hr>
is a technique for randomly placing data areas in virtual memory. Typically these are the heap, stack, and library positions.
 
This process makes it possible to limit the effects of buffer overflow attacks, for example.
 
It consists of making the configuration of processes “random”, by placing different basic elements in variable locations.
 
To list the set of shared libraries.

```terminal
ldd /bin/sh
```
output
```
linux-vdso.so.1 (0x00007fff6a9be000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0a7eb0e000)
/lib64/ld-linux-x86-64.so.2 (0x00007f0a7ed19000)
```
when we execute the code again the address changes. 0x00007fff6a9be000,0x00007f0a7eb0e000,0x00007f0a7ed19000

```terminal
ldd /bin/sh
```
output
```
linux-vdso.so.1 (0x00007ffce3302000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0147830000)
/lib64/ld-linux-x86-64.so.2 (0x00007f0147a3b000)
```
# DEP
<hr>
Data Execution Prevention (DEP) is a security feature built into many modern operating systems such as Linux, Mac OS X, iOS, Microsoft Windows and Android.
 
 It is intended to prevent the execution of code from blocks of memory expected to contain data in order to lower the probability of a successful buffer overflow attack.

# Bit NX
<hr>
It is an executable space protection technique used in processors to dissociate memory areas containing instructions, therefore executable, from areas containing data, protecting the system from viruses and Trojan horses using buffer overflow vulnerabilities. .

ASLR_DEP_BitNX

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