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- #ARMA 3 TASK FORCE RADIO NOT WORKING IN PRIVATE CALL MOD#
- #ARMA 3 TASK FORCE RADIO NOT WORKING IN PRIVATE CALL CODE#
CBA does this thing where they use virtual location objects to store variables like another namespace. First off, let’s take a look at line # 80, where GVAR(actions) is given a value.įrom this, we can see that it is a common namespace that CBA likes to make. I recommend opening the hastebin to follow along. I will be using screenshots of snippets from CBA_fnc_addKeybind but will refer to line numbers. This is quite a large function, so I have provided a link to it on my hastebin. To do so, we must take a look at CBA’s CBA_fnc_addKeybind function. If we can modify GVAR(actions), then we can change the values of our specific actions keybind. So we can conclude, _action = “tfar$lrtransmit” based on the input parameters of CBA_fnc_getKeybind (this is important and will be used later). _action is a string formatted by our input parameters. _actionInfo is set by GVAR(actions) getVariable _action. Looking at line #16, we can see _keybinds is at the 2nd index of _actionInfo.įinally, we come to the point at which the complexity of this exploit increases. Great, so now we just need to modify _keybinds. Quickly, checking out that line, we can see that param does not have a default type or any checks on the internal data types. Working backwards, _oldKeybind is index 0 of _keybinds. Index 5 of this return value is _oldKeybind. So the first thing I look at in CBA_fnc_getKeybind is the return value. Looking back at TFAR’s code, we can see that the item in index 5 is where _mods is derrived from. These comments describe how the exploit works, and I’ll get into them towards the end. Quick warning, you will see comments in the code. If we can control the output of CBA’s CBA_fnc_getKeybind function, we can exploit this function! Let’s take a look at CBA_fnc_getKeybind. Looking again at the code, _mods comes from _keybind, and _keybind comes from CBA_fnc_getKeybind.
#ARMA 3 TASK FORCE RADIO NOT WORKING IN PRIVATE CALL CODE#
My next step is to figure out what SQF code determines the value of these fields. What this is telling me is that, if I can change the value of _mods, I can execute code through any of these fields.
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While looking at TFAR’s files, I came across fn_onLRTangentReleasedHack.sqf which contains 3 instances of this identifier. Either the variable is hard-coded or I cannot manipulate it.
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Very often this identifier leads to a dead end. If B is a variable, there is a possibility that I can change the value of it, thus allowing a lazy eval code execution. One of the identifiers I use for lazy eval exploits is A and B, where B is a variable. Opening up the script files, I was looking for any lazy eval exploits.
#ARMA 3 TASK FORCE RADIO NOT WORKING IN PRIVATE CALL MOD#
The way I find exploits is by opening up a mod and looking through all of its scripts for a few identifiers that could point to a vulnerability. Hopefully, at the end of this, you’ll understand how the TFAR exploit works, and how I created it from my initial thought. It’s going to be different than how I normally explain exploits. To best explain my logic, I am going to take you down the path of how I figured out this exploit. If you do not know what Lazy Evaluation is, I recommend reading that previous post to get a grasp on this style of exploit. I am going to dive directly into the code that drives TFAR, and do my best at explaining a type of lazy eval code execution that is much more complex than the previous exploit I covered.
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I am not going to go into how the mod works, you can check it out here. Everyone who has played Arma for an extended period has come across TFAR, Task Force Arrowhead Radio.
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