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[Exploit + fix]Lets hack: Stack subclass skills ( Race condition exploit ).


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Posted

wont work that way cause l2j uses a lock on subclass if i remember correctly. When something wants to change the class, it must wait in that lock for its turn.

damn >.<

anyway if i'll ever start l2 again i'll try ur way :P

Posted

no, because you do not kill the mob, someone from your party does

 

Add another simple check for party members maybe being currently in combat.

Posted

Anyway those conditions ( l2j was doing fixes that way in the past ) are not the right way to fix problems. A problem can lead to several exploits, blocking the exploit, wont fix the problem. But taking care of the problem itself, will fix all exploits related to them. When i went in some br interlude server some weeks ago, they had some protection ( l2jbrazil ) that you are not allowed to have equiped weapon when you change subclass. Obvious stupid is obvious :) Those checks can be bypassed, the solution is to lock the right function that handles the skill awarding in different cases.

Posted

Anyway those conditions ( l2j was doing fixes that way in the past ) are not the right way to fix problems. A problem can lead to several exploits, blocking the exploit, wont fix the problem. But taking care of the problem itself, will fix all exploits related to them. When i went in some br interlude server some weeks ago, they had some protection ( l2jbrazil ) that you are not allowed to have equiped weapon when you change subclass. Obvious stupid is obvious :) Those checks can be bypassed, the solution is to lock the right function that handles the skill awarding in different cases.

 

And who guarantees that your possible fix doesnt create (new) exploits as well? :D

  • 3 weeks later...
Posted

lol!

it's new. never shared before here!

BUT... a friend discovered this one 1 or 2 years before and we decided not telling it to anyone on web so it wouldnt be fixed by anyone!

but now......dmn you! :P

 

btw.sharing it is allright. but why how to fix it?

Posted

A way i propose is using a lock object that gets locked by both the two methods ( setActiveSubclass and levelUp ) so as they cant race together. Or even using the existing subclass lock they have ( i think ) in l2j. Just try to lock it when getting level up.

 

The idea behind going inside an exploit and figuring how it works is to help us discover more by understanding the mechanisms behind exploits. Btw did you guys find it by chance, just by experimenting with ingame actions ? :)

Posted

The idea behind going inside an exploit and figuring how it works is to help us discover more by understanding the mechanisms behind exploits. Btw did you guys find it by chance, just by experimenting with ingame actions ? :)

the main idea came to my friend and then we tried it and really worked!!! :D

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    • this is literally like such bad advice? i dont thikn you understand the question..   node_begin name=[Ability] type=5 sub_node_begin paramType=100 unk=0 nodeName=[Type] int_params={1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[SkillID] int_params={19233;19234;19235;19236;19237;19238;19239;19240;19241;19242;19243;19244;19245;19246;19247;19248;19249;19250;19251;19252;19253;19254;19255;19256;19257;19258;19259;19260;19261;19262;19263;19264;19265;19266;19267;19268;19269;19270;19271;19272;19273;19274;19275;19276;19277;19278;19279;19280;19281;19282;19283;19284;19285;19286;19287;19288;19289} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[SkillLev] int_params={3;3;3;3;2;2;2;2;4;1;4;1;2;2;2;2;2;1;1;2;1;2;4;4;3;2;3;1;3;2;3;1;2;2;1;2;2;2;2;1;2;3;3;3;3;1;3;2;1;2;2;2;2;2;2;2;1} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[Depth] int_params={1;1;1;1;2;2;2;2;3;3;3;3;4;4;4;4;5;5;5;5;6;1;1;1;2;2;2;2;3;3;3;3;4;4;4;4;5;5;5;6;1;1;1;2;2;2;3;3;3;4;4;4;4;5;5;5;6} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[Column] int_params={1;2;3;4;1;2;3;4;1;2;3;4;1;2;3;4;1;2;3;4;2;1;2;4;1;2;3;4;1;2;3;4;1;2;3;4;1;2;4;2;1;2;4;1;3;4;1;2;4;1;2;3;4;1;2;4;2} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[RequireLev] int_params={85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85;85} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[RequireSkillID] int_params={0;0;0;0;0;0;0;19236;19237;0;19239;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;19257;0;19259;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;19276;0;0;0;0;0;0;0;0;0;0} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[RequireSkillLev] int_params={0;0;0;0;0;0;0;3;2;0;2;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;3;0;3;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;3;0;0;0;0;0;0;0;0;0;0} sub_node_end sub_node_begin paramType=100 unk=0 nodeName=[RequireCount] int_params={0;0;0;0;5;5;5;5;10;10;10;10;15;15;15;15;20;20;20;20;25;0;0;0;5;5;5;5;10;10;10;10;15;15;15;15;20;20;20;25;0;0;0;5;5;5;10;10;10;15;15;15;15;20;20;20;25} sub_node_end sub_node_begin paramType=115 unk=0 nodeName=[Name] string_params={[Guardian's Shield];[Guardian's Magic Barrier];[Guardian's Body];[Guardian's Elemental Cover];[Guardian's Armor Defense];[Guardian's Leather Defense];[Guardian's Tunic Defense];[Guardian's Resistance];[Guardian's Life];[Guardian's Block];[Guardian's Armor];[Guardian's Guidance];[Guardian's Death Shield];[Guardian's Focus Shield];[Guardian's Mind Control];[Guardian's Blessing];[Guardian's Binding Cover];[Guardian's Spirit];[Guardian's Potential];[Guardian's Expert Potion];[Guardian's Defense Master];[Berserker's Haste];[Berserker's Might];[Berserker's Elemental Attack];[Berserker's Craft Focus];[Berserker's Backfire];[Berserker's Focus];[Berserker's Cost];[Berserker's Craft Death];[Berserker's Mortal];[Berserker's Death Whisper];[Berserker's Eagle];[Berserker's Battle];[Berserker's Fire];[Berserker's Skill Reduction];[Berserker's Blessing];[Berserker's Binding Attack];[Berserker's Divine Attack];[Berserker's Expert Potion];[Berserker's Combat Master];[Magician's Acumen];[Magician's Empower];[Magician's Elemental Shot];[Magician's Wild Magic];[Magician's Condition];[Magician's Eva];[Magician's Mystic];[Magician's Prominence];[Magician's Sight];[Magician's Protection];[Magician's Water];[Magician's Magic Reduction];[Magician's Blessing];[Magician's Binding Shot];[Magician's Divine Shot];[Magician's Expert Potion];[Magician's Spell Master]} sub_node_end sub_node_begin paramType=115 unk=0 nodeName=[Icon] string_params={[icon.skill19120];[icon.skill19121];[icon.skill1045];[icon.skill1352];[icon.skill0231];[icon.skill0233];[icon.skill0234];[icon.skill1354];[icon.skill1229];[icon.skill1304];[icon.skill19165];[icon.skill19127];[icon.skill1542];[icon.skill0986];[icon.skill19132];[icon.skill_exp_sp_up];[icon.skill0335];[icon.skill10044];[icon.skill1532];[icon.skill_potion_up];[icon.skill0528];[icon.skill1086];[icon.skill19139];[icon.skill19130];[icon.skill0193];[icon.skill0030];[icon.skill1077];[icon.skill19140];[icon.skill10655];[icon.skill0330];[icon.skill4278];[icon.skill19127];[icon.skill1388];[icon.skill1356];[icon.skill0758];[icon.skill_exp_sp_up];[icon.skill0983];[icon.skill11011];[icon.skill_potion_up];[icon.skill1499];[icon.skill1085];[icon.skill1059];[icon.skill19130];[icon.skill1303];[icon.skill1501];[icon.skill0214];[icon.skill19160];[icon.skill0330];[icon.skill19127];[icon.skill0046];[icon.skill1355];[icon.skill0945];[icon.skill_exp_sp_up];[icon.skill0983];[icon.skill11011];[icon.skill_potion_up];[icon.skill1500]} sub_node_end sub_node_begin paramType=115 unk=0 nodeName=[IconPanel] string_params={[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_blessed];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.pannel_pupple];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2];[icon.panel_2]} sub_node_end sub_node_begin paramType=109 unk=0 nodeName=[LevelDesc] array_params={{[P. Def. + 2%];[P. Def. + 4%];[P. Def. + 7%]};{[M. Def. + 2%];[M. Def. + 4%];[M. Def. + 7%]};{[Max HP + 3%];[Max HP + 6%];[Max HP + 9%]};{[All Attribute Defense + 15];[All Attribute Defense + 25];[All Attribute Defense + 40]};{[When equipping Heavy Armor <br>P./M. Def. + 3%];[When equipping Heavy Armor <br>P./M. Def. + 6%]};{[When equipping Light Armor <br>P./M. Def. + 3%];[When equipping Light Armor <br>P./M. Def. + 6%]};{[When equipping Robe <br>P./M. Def. + 3%];[When equipping Robe <br>P./M. Def. + 6%]};{[Debuff Resistance + 5%];[Debuff Resistance + 10%]};{[Max HP + 3%];[Max HP + 6%];[Max HP + 10%];[Max HP + 15%]};{[Shield Defense + 100%]};{[P. Def. + 2%];[P. Def. + 4%];[P. Def. + 8%];[P. Def. + 12%]};{[P. Accuracy, M. Accuracy,<br>servitor's P. Accuracy + 12.<br>Enchants Revelation skill]};{[Received P. Critical Damage - 10%];[Received P. Critical Damage - 20%]};{[Chance of receiving P. Critical Damage - 15%];[Chance of receiving P. Critical Damage - 30%]};{[Skill Cooldown - 3%];[Skill Cooldown - 5%]};{[EXP, SP + 5%];[EXP, SP + 10%]};{[Received damage when immobilized - 7%];[Received damage when immobilized - 15%]};{[All Attribute Defense + 50]};{[Skill Critical Rate + 10%]};{[Recovery Potion, Elixir Effect + 500];[Recovery Potion, Elixir Effect + 1000]};{[Received Damage - 10%]};{[Atk. Spd. + 1%];[Atk. Spd. + 3%]};{[P. Atk. + 1%];[P. Atk. + 2%];[P. Atk. + 3%];[P. Atk. + 4%]};{[Attack Attribute + 10];[Attack Attribute + 20];[Attack Attribute + 30];[Attack Attribute + 40]};{[P. Skill Critical Rate + 3%];[P. Skill Critical Rate + 6%];[P. Skill Critical Rate + 10%]};{[Rear Damage + 2%];[Rear Damage + 5%]};{[P. Critical Rate + 10];[P. Critical Rate + 20];[P. Critical Rate + 40]};{[Skill MP Consumption - 5%]};{[P. Skill Critical Damage + 2%];[P. Skill Critical Damage + 4%];[P. Skill Critical Damage + 7%]};{[Skill Mastery Rate + 30%];[Skill Mastery Rate + 60%]};{[P. Critical Damage + 2%];[P. Critical Damage + 4%];[P. Critical Damage + 7%]};{[P. Accuracy, M. Accuracy,<br>servitor's P. Accuracy + 12.<br>Enchants Revelation skill]};{[P. Atk. + 3%];[P. Atk. + 6%]};{[P. Skill Power + 2%];[P. Skill Power + 5%]};{[Skill Cooldown - 3%]};{[EXP, SP + 5%];[EXP, SP + 10%]};{[Damage to immobilized<br>targets + 5%];[Damage to immobilized<br>targets + 10%]};{[Attack Attribute + 25];[Attack Attribute + 50]};{[Recovery Potion, Elixir Effect + 500];[Recovery Potion, Elixir Effect + 1000]};{[Damage + 10%]};{[Casting Spd. + 2%];[Casting Spd. + 4%]};{[M. Atk. + 2%];[M. Atk. + 5%];[M. Atk. + 8%]};{[Attack Attribute + 10];[Attack Attribute + 20];[Attack Attribute + 40]};{[M. Critical Rate + 10];[M. Critical Rate + 20];[M. Critical Rate + 40]};{[Max HP, MP + 3%];[Max HP, MP + 6%];[Max HP, MP + 9%]};{[Skill MP Consumption - 5%]};{[M. Critical Damage + 3%];[M. Critical Damage + 6%];[M. Critical Damage + 10%]};{[Skill Mastery Rate + 30%];[Skill Mastery Rate + 60%]};{[P. Accuracy, M. Accuracy,<br>servitor's P. Accuracy + 12.<br>Enchants Revelation skill]};{[Mental, Stun, Aerial Yoke<br>Success Rate + 5%];[Mental, Stun, Aerial Yoke<br>Success Rate + 10%]};{[M. Skill Power + 2%];[M. Skill Power + 5%]};{[Skill Cooldown - 3%];[Skill Cooldown - 5%]};{[EXP, SP + 5%];[EXP, SP + 10%]};{[Damage to Immobile<br>Opponents + 5%];[Damage to Immobile<br>Opponents + 10%]};{[Attack Attribute + 25];[Attack Attribute + 50]};{[Recovery Potion, Elixir Effect + 500];[Recovery Potion, Elixir Effect + 1000]};{[Damage + 10%]}} sub_node_end node_end @babyjason in regards to your post ><
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