This time, they also provide the source code
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcZSJ9Yt7RfsUSFUDJ9ApuwSFkF5dVqlZJS61DZT7F1IdVCMC7Lev305q9EWT6-2q02kPosdtnv2Fj3FpR1wVoAyn2Rh7NDlN-UjZxELwVSCs4_VBe5eIHDQFh0h1wZULRxlLpD6XVGx4/s640/Screenshot+from+2018-01-29+00-27-08.png)
there are UNWANTED variable in this challenge.
but I try to use the payload that used in evilpython-50pts challenge.
that payload still working!!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCnRWWKPAD-FBV0UuhQNC6ldf8yCXVIrwMx-RZDHVgZFoPVJCSFHEMqs5MLpc2x-KXTUaxaHqzDocCxa3o_zYZa9OZQWHYNVmaOa58iPcw3Doi8RqIKQnLBR35OQDMccpVzOprCCmQDiM/s640/Screenshot+from+2018-01-29+00-31-57.png)
Flag : mcsc{exec_is_evil_t00}
Bingo!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjR5W4_JbGMR36WFue-NA_roakAYazEwPnNbfcZ1UVxNxAwUlPv2FPw4FjSyGpZTbynAQv_rZjTk7p-hRgL2BCsw3PpO5L3udY4oXai4vHIi_0wyuOsN-7WBmNhdi56qulwUG-W4INtKxs/s640/Screenshot+from+2018-01-29+00-31-06.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2pInyihld-lSM7fJTwkAK0RkgBDFWf9fejwu0WiXf37BLAOiq_XPVBLPNS0AjllraiC5ibuPy-7Lx5Tmr_uxaCnQvZWnibyGgbh1zA7AuXEOo8CJhyEDQN0HqhV3aRVfJyvSSH0v9tNI/s640/Screenshot+from+2018-01-29+00-39-20.png)
Thank For Reading.
This is fourth challenge that I solved in MCSC2018.
And the first solver team of that challenge, so we got another bonus (1 point ).
I want to say thank you to challenge creator.
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