# C code using getenv()
In "blog" CTF on TryHackMe, I encountered a chellenge where a C binary had SUID set. The binary's strings and ltrace output looked like this:
We see the binary is checking if environment variable "admin" is set.
And in strings output, we see "system" call being made. According to me pseudocode goes something like:
```clike
#include
int main(){
if(getenv("admin"))
{
system("/bin/bash");
}
}
```
So, I set "admin" environment variable and ran the binary called "checker" and got root!
