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超絶技巧CSRF / Shibuya.XSS techtalk #7
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mala
March 28, 2016
Programming
41
14k
超絶技巧CSRF / Shibuya.XSS techtalk #7
CSRF, HTML Form Protocol Attack, Cross-protocol scripting attackについて
mala
March 28, 2016
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Transcript
$43' NBMB ઈٕ
ࠓͷςʔϚ w $43'ʹ͍ͭͯ w Έͳ͞Μ͝ଘͰ͢ΑͶ w ͋·Γ͍͜͠ͱ͠·ͤΜ
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୯ͳΔΠλζϥ͔ΒΞΧϯτͬऔΓ·Ͱ
ະͩʹଟ͋͘Δ w 944ਖ਼͍͠ίʔυΛॻ͍͍ͯΕݩʑى͖ͳ ͍ w $43'ରࡦηΩϡϦςΟͷͨΊͷՃͷࢪࡦ w ϑϨʔϜϫʔΫͳͲͰࣗಈԽ͞Εͯͳ͍ͱ࿙ΕΔ w อޢ͖͔͢Ͳ͏͔ͷஅ͕͍͠
$43'ࣄޙରॲʹͳΓ͕ͪ w ·͋ɺͿͬͪΌ͚ܝࣔ൘ͱ͔ථͱ͔ίϝϯτ ػೳͱ͔ࣄޙରॲͰྑ͍ͱࢥ͍·͢ w ॏཁػೳ͕ಉ͡ײ֮ͰࣄޙରॲͩͱϠόΠʂ w ˠϦεΫͷߴ͍$43'ʹ͍ͭͯհ͠·͢
ΞΧϯτͬऔΓ w ةݥͳ$43'ͷදతͳͷ w ύεϫʔυมߋ͕$43'ͰՄೳ w ϝʔϧΞυϨεมߋ͕$43'ͰՄೳ
࿈ܞΞΧϯτՃ w 0"VUI TUBUFύϥϝʔλͬͯͳ͍ w ෳϓϩόΠμͷJEͰϩάΠϯ͕Մೳ w ׂͱ͋Γ͕ͪ
ωοτϫʔΫػثͷ߈ܸ w +7/ϧʔλʔ$43'ͳͲͰάάοͯΈͯͶ
͍ΖΜͳͷʹ$43'͢Δ w $43'Ͱ+40/9.-ΛૹΔ w GPSNFODUZQFUFYUQMBJOΛ͏ w IUUQJUTFDVSJUZDPODFQUTDPN DTSGPOKTPOSFRVFTUT w IUUQQFOUFTUNPOLFZOFUCMPHDTSGYNM
QPTUSFRVFTU
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1000000 8 hogehoge </textarea> <input type="submit"> </form>
$43'ͰNFNDBDIFEʹॻ͖ࠐΉ <form method="POST" enctype="text/plain" action="http://127.0.0.1:11211"> <textarea name="val"> set hoge 0
1000000 8 hogehoge </textarea> <input type="submit"> </form>
͑ͬʁ w ͍͖ͳΓIUUQͷนΛӽ͑ͯߦ͖·ͨ͠Ͷ w ରԠ͍ͯ͠ͳ͍ίϚϯυແࢹ͞ΕΔ POST / HTTP/1.1 ERROR w
NFNDBDIFEQSPUPDPMͱͯ͠ղऍՄೳͳ෦ͩ ͚ධՁ͞ΕΔɻ
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w ϙʔτมߋͯ͠ͷӡ༻࠷ۙͷ/P42-αʔόʔͳΜ͔ อޢ͞Ε͍ͯͳ͍
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ࠓYISTFOE CMPC ͰՄೳ
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CMPC ͰόΠφϦૹΕΔΑ͏ʹɻ w ΤϥʔΛదʹແࢹͯ͘͠ΕΕ όΠφϦϓϩτί ϧͰ$43'ͰΕΔ
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None
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ύεϫʔυೝূʹΑΔରࡦ w NFNDBDIFEೝূػߏ͕ແ͍ w *1ΞυϨεΠϯλϑΣʔε੍ݶͰೝূػߏΛඋ ͍͑ͯͳ͍ϛυϧΣΞଟ͍ w ೝূ͔͚͓͚ͯ0, ˠਖ਼ղؒҧ͍
ೝূΛಥഁ͢Δ$43' w 3FEJTͩͱύεϫʔυΛ͔͚ΒΕΔ w 3FEJTͷύεϫʔυೝূ BVUINZTFDSFUQBTTXPSE TFULFZWBMVF w ͜ΜͳͷΛૹΕྑ͍͚ͩͳͷͰಥഁՄೳ
ϛυϧΣΞͷύεϫʔυ w ͔͚͓ͯ͘ʹͨ͜͜͠ͱͳ͍͕ w ෦ͷωοτϫʔΫߏͳͲ͕طʹͳΔέʔε ˠιʔείʔυઃఆใ࿙Ӯ͍ͯ͠Δ͜ͱ ఆ͖͢ w ྫ͑ୀ৬ऀ͕෦ใΛώϯτʹݱ৬ࣾһΛ ᠘ʹ͔͚ͯSFNPUFDPEFFYFDVUJPOՄೳ
$43'ͰಥഁͰ͖Δೝূ w ݁ՌͷಡΈऔΓͷඞཁ͕ͳ͍ೝূํࣜͰ͋Εɺ ύεϫʔυΛૹΓ͚ͭΔ͚ͩͳͷͰಥഁՄೳ w νϟϨϯδϨεϙϯεܗࣜͷೝূͰ͋Εಥഁ Ͱ͖ͳ͍ w $43'ͰϦΫΤετͷ݁Ռ͕ಡΊͳ͍ͷͰ
ϛυϧΣΞͷ$43'ରࡦ w "$-͋Δ͔Β҆શͱࢥͬͯ·ͤΜ͔ʁ w ωοτϫʔΫࣗମΛִ͢Δͷ͕ྑ͍ w ִ͢ΔͷͪΌΜͱִɺιʔείʔυ ύεϫʔυ͕طͳΒ߈ܸͰ͖ΔΑ͏ͳͷ ʮୀ৬ऀ͚όοΫυΞʯ
ࠓޙͷͱରࡦ w ϙʔτ੍ݶʹ͍༷͕ͭͯ໌֬Խ͞ΕΔΑ͏ ʹͳͬͨ w IUUQTGFUDITQFDXIBUXHPSHQPSU CMPDLJOH w ͔͠͠XFMMLOPXOͰͳ͍QPSUҾ͖ଓ͖ DSPTTQSPUPDPMBUUBDL͕ՄೳͰ͠ΐ͏
ࠓޙͷͱରࡦ w ෦ωοτϫʔΫ͚ͷ$43'ରࡦ w $034BOE3'$ IUUQTNJLFXFTUHJUIVCJPDPSTSGD w ϒϥβଆͰͷରࡦೖΔ͔
ྨࣅͷ w $SPTTTJUF TDSJQUJOHSFRVFTUGPSHFSZ w TJUFˠQSPUPDPMTJUFˠBQQ w *1$ͷͨΊͷϩʔΧϧαʔόʔΛ࡞ΔΞϓϦ w
ΧελϜεΩʔϜͷϦΫΤετڧ੍ w ϦΫΤετҰํతʹૹΕΔ૬ޓʹೝূ͢Δϓ ϩτίϧʹͳ͍ͬͯΔ͔֬ೝ͠·͠ΐ͏
·ͱΊ w $43'ΛͳΊ͍͚ͯͳ͍ w ʮউखʹॻ͖ࠐΈʯग़དྷΔ͚͕ͩͩ ॻ͖ࠐΈରʹΑͬͯग़དྷΔ͜ͱ͕෯͍ w DSPTTQSPUPDPMͳ$43' YISTFOE
CMPC ͰόΠφϦૹΕΔ w )5.-Ͱػೳ͕૿͑Δˠ߈ܸํ๏ϦεΫ૿Ճ
ऴΘΓ w "OZRVFTUJPOT