Mirrors/hacktricks
2
0
Fork 0
mirror of https://github.com/carlospolop/hacktricks synced 2024-11-24 21:53:54 +00:00
Code Issues Projects Releases Packages Wiki Activity

f

Browse source
This commit is contained in:
Carlos Polop 2024-06-17 11:28:38 +02:00
parent e40f450b54
commit f8af83b6b4
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
binary-exploitation/arbitrary-write-2-exec/aw2exec-got-plt.md
View file

@ -62,15 +62,15 @@ Common functions of the libc are going to call **other internal functions** whos
Find [**more information about this technique here**](https://github.com/nobodyisnobody/docs/blob/main/code.execution.on.last.libc/README.md#1---targetting-libc-got-entries).
## **Free2system**
### **Free2system**
In heap exploitation CTFs it's common to be able to control the content of chunks and at some point even overwrite the GOT table. A simple trick to get RCE if one gadgets aren't available is to overwrite the `free` GOT address to point to `system` and to write inside a chunk `"/bin/sh"`. This way when this chunk is freed, it'll execute `system("/bin/sh")`.
## **Strlen2system**
### **Strlen2system**
Another common technique is to overwrite the **`strlen`** GOT address to point to **`system`**, so if this function is called with user input it's posisble to pass the string `"/bin/sh"` and get a shell.
Moreover, if `puts` is used with user input, it's possible to overwrite the `puts` GOT address to point to `system` and pass the string `"/bin/sh"` to get a shell because **`puts` will call `strlen` with the user input**.
Moreover, if `puts` is used with user input, it's possible to overwrite the `strlen` GOT address to point to `system` and pass the string `"/bin/sh"` to get a shell because **`puts` will call `strlen` with the user input**.
## **One Gadget**