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We ranked #10 globally in PicoCTF 2024! Elements This problem is essentially an XSS + CSP bypass. The XSS part was easy: we need to construct a dependency tree to build the XSS element. For this, I used topological sorting. import graphlib recipies = [["Ash","Fire","Charcoal"],["Steam Engine","Water","Vapor"],["Brick Oven","Heat Engine","Oven"],["Steam Engine","Swamp","Sauna"],["Magma","Mud","Obsidian"],["Earth","Mud","Clay"],["Volcano","Water","Volcanic Rock"],["Brick","Fog","Cloud"],["Obsidian","Rain","Black Rain"],["Colorful Pattern","Fire","Rainbow Fire"],["Cloud","Obsidian","Storm"],["Ash","Obsidian","Volcanic Glass"],["Electricity","Haze","Static"],["Fire","Water","Steam"],["Dust","Rainbow","Powder"],["Computer Chip","Steam Engine","Artificial Intelligence"],["Fire","Mud","Brick"],["Hot Spring","Swamp","Sulfur"],["Adobe","Graphic Design","Web Design"],["Colorful Interface","Data","Visualization"],["IoT","Security","Encryption"],["Colorful Pattern","Mosaic","Patterned Design"],["Earth","Steam Engine","Excavator"],["Cloud Computing","Data","Data Mining"],["Earth","Water","Mud"],["Brick","Fire","Brick Oven"],["Colorful Pattern","Obsidian","Art"],["Rain","Steam Engine","Hydropower"],["Colorful Display","Graphic Design","Colorful Interface"],["Fire","Mist","Fog"],["Exploit","Web Design","XSS"],["Computer Chip","Hot Spring","Smart Thermostat"],["Earth","Fire","Magma"],["Air","Earth","Dust"],["Cloud","Rainbow","Rainbow Cloud"],["Dust","Heat Engine","Sand"],["Obsidian","Thunderstorm","Lightning Conductor"],["Cloud","Rain","Thunderstorm"],["Adobe","Cloud","Software"],["Hot Spring","Rainbow","Colorful Steam"],["Dust","Fire","Ash"],["Cement","Swamp","Marsh"],["Hot Tub","Mud","Mud Bath"],["Electricity","Glass","Computer Chip"],["Ceramic","Fire","Earthenware"],["Haze","Swamp","Fog Machine"],["Rain","Rainbow","Colorful Display"],["Brick","Water","Cement"],["Dust","Haze","Sandstorm"],["Ash","Hot Spring","Geothermal Energy"],["Ash Rock","Heat Engine","Mineral"],["Electricity","Software","Program"],["Computer Chip","Fire","Data"],["Colorful Pattern","Swamp","Algae"],["Fog","Water","Rain"],["Rainbow Pool","Reflection","Color Spectrum"],["Artificial Intelligence","Data","Encryption"],["Internet","Smart Thermostat","IoT"],["Cinder","Heat Engine","Ash Rock"],["Brick","Swamp","Mudbrick"],["Computer Chip","Volcano","Data Mining"],["Obsidian","Water","Hot Spring"],["Computer Chip","Thunderstorm","Power Surge"],["Brick","Obsidian","Paving Stone"],["User Input","Visualization","Interactive Design"],["Mist","Mud","Swamp"],["Geolocation","Wall","Map"],["Air","Rock","Internet"],["Computer Chip","Rain","Email"],["Fire","Rainbow","Colorful Flames"],["Hot Spring","Mineral Spring","Healing Water"],["Ceramic","Volcano","Lava Lamp"],["Brick Oven","Wall","Fireplace"],["Glass","Software","Vulnerability"],["Fog","Mud","Sludge"],["Fire","Marsh","S'mores"],["Artificial Intelligence","Data Mining","Machine Learning"],["Ash","Brick","Brick Kiln"],["Fire","Obsidian","Heat Resistant Material"],["Hot Spring","Sludge","Steam Engine"],["Artificial Intelligence","Computer Chip","Smart Device"],["Fire","Steam Engine","Heat Engine"],["Ash","Earth","Cinder"],["Rainbow","Reflection","Refraction"],["Encryption","Software","Cybersecurity"],["Graphic Design","Mosaic","Artwork"],["Colorful Display","Data Mining","Visualization"],["Hot Spring","Water","Mineral Spring"],["Rainbow","Swamp","Reflection"],["Air","Fire","Smoke"],["Program","Smart HVAC System","Smart Thermostat"],["Haze","Obsidian","Blackout"],["Brick","Earth","Wall"],["Heat Engine","Steam Locomotive","Railway Engine"],["Ash","Thunderstorm","Volcanic Lightning"],["Mud","Water","Silt"],["Colorful Pattern","Hot Spring","Rainbow Pool"],["Fire","Sand","Glass"],["Art","Web Design","Graphic Design"],["Internet","Machine Learning","Smart HVAC System"],["Electricity","Power Surge","Overload"],["Colorful Pattern","Computer Chip","Graphic Design"],["Air","Water","Mist"],["Brick Oven","Cement","Concrete"],["Artificial Intelligence","Cloud","Cloud Computing"],["Computer Chip","Earth","Geolocation"],["Color Spectrum","Graphic Design","Colorful Interface"],["Internet","Program","Web Design"],["Computer Chip","Overload","Circuit Failure"],["Data Mining","Geolocation","Location Tracking"],["Heat Engine","Smart Thermostat","Smart HVAC System"],["Brick","Mud","Adobe"],["Cloud","Dust","Rainbow"],["Hot Spring","Obsidian","Hot Tub"],["Steam Engine","Volcano","Geothermal Power Plant"],["Earth","Fog","Haze"],["Brick","Steam Engine","Steam Locomotive"],["Brick","Colorful Pattern","Mosaic"],["Hot Spring","Steam Engine","Electricity"],["Ash","Volcano","Volcanic Ash"],["Electricity","Water","Hydroelectric Power"],["Brick","Rainbow","Colorful Pattern"],["Silt","Volcano","Lava"],["Computer Chip","Software","Program"],["Hot Spring","Thunderstorm","Lightning"],["Ash","Clay","Ceramic"],["Cybersecurity","Vulnerability","Exploit"],["Ash","Heat Engine","Ash Residue"],["Internet","Smart Device","Cloud Computing"],["Magma","Mist","Rock"],["Interactive Design","Program","Smart Device"],["Computer Chip","Electricity","Software"],["Colorful Pattern","Graphic Design","Design Template"],["Fire","Magma","Volcano"],["Earth","Obsidian","Computer Chip"],["Geolocation","Location Tracking","Real-Time Positioning"]] orig = ['Fire', 'Water', 'Earth', 'Air'] dependencies = {} for r in recipies: dependencies[r[2]] = [r[0], r[1]] dep_set = set() dep_graph = {} def trace_dependency(dep, level = 0): if dep in dep_set: return if dep in dependencies: dep_graph[dep] = set(dependencies[dep]) for d in dependencies[dep]: if d in orig: continue trace_dependency(d, level+1) trace_dependency("XSS") ts = graphlib.

PicoCTF 2024 Elements Writeup

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