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Yasuhiro Onishi
May 14, 2013
Technology
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1.1k
hatena-diary-blog-xss
はてなダイアリーやブログのXSS対策の事例を紹介します
Yasuhiro Onishi
May 14, 2013
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Transcript
μΠΞϦʔͱϒϩάͱ 944 גࣜձࣾͯͳ JEPOJTIJ !4IJCVZB944JO0TBLB
ࣗݾհ wJEPOJTIJେ߁༟ wגࣜձࣾͯͳ wνʔϑΤϯδχΞ wͯͳϒϩάσΟϨΫλʔ
ͯͳͱݴ͑944
ͯͳφ
ͯͳφ
ͯͳͱ944 wਓྗݕࡧͯͳRIBUFOBOFKQ wͯͳΞϯςφBIBUFOBOFKQ wͯͳμΠΞϦʔEIBUFOBOFKQ wͯͳϒοΫϚʔΫCIBUFOBOFKQ
ͯͳͱ944 wಉҰυϝΠϯɾಉҰΫοΩʔʹΑΔ Ϣʔβʔೝূ wΫοΩʔΛୣΘΕͨΒηογϣϯϋ ΠδϟοΫ͞ΕಘΔ
ͯͳμΠΞϦʔ wϦϦʔεͷϒϩάαʔϏε wཧը໘ͱϒϩάը໘͕ಉҰυϝΠϯ wϒϩάαʔϏεˠϢʔβʔίϯςϯπ
ͦͷฤू
ͦͷฤू
Ϣʔβʔίϯςϯπ w͖ͳ͜ͱΛॻ͖͍ͨ w͖ͳσβΠϯʹ͍ͨ͠ w͖ͳϒϩάύʔπΛ͍͍ͨ
Ϣʔβʔརศੑͱ ҆શੑͷཱ྆
Ϣʔβʔίϯςϯπ w͖ͳ͜ͱΛॻ͖͍ͨˠ)5.-944 w͖ͳσβΠϯʹ͍ͨ͠ˠ$44944 w͖ͳϒϩάύʔπΛ͍͍ͨˠººº
)5.-ͷ944ରࡦ wར༻Մೳཁૉ wར༻Մೳଐੑ wελΠϧཁૉ wΠϯϥΠϯ$44
ҙ͖͢ཁૉ wTDSJQU wPCKFDU wFNCFE wJGSBNF wTUZMF w
ҙ͖͢ଐੑ wΠϕϯτϋϯυϥ PODMJDL PO wKBWBTDSJQUεΩʔϚ͕ॻ͚Δཁૉ wISFG TSD DJUF wTUZMF wޙड़
ͯͳμΠΞϦʔͷ944ରࡦ wར༻ՄೳཁૉˠϗϫΠτϦετܗࣜ wར༻ՄೳଐੑˠϗϫΠτϦετܗࣜ wಛఆͷཁૉɾଐੑˠઐ༻ͷରࡦ wεΩʔϜରࡦ wελΠϧରࡦ
$44ͷ944ରࡦ wFYQSFTTJPOରࡦ w!JNQPSUରࡦ
FYQSFTTJPO color: expression( error ? 'red' : 'blue');
FYQSFTTJPOίϝϯτ expr/* ίϝϯτ */ession
FYQSFTTJPOίʔυϙΠϯτ \0065xpression
FYQSFTTJPOશ֯ ̴̴̸͇̿́͂͂̾̽
FYQSFTTJPOจࣈ <p style="{ color: expression('blue') }">
FYQSFTTJPOҟମ expressio\207f expressioⁿ ˣ
!JNQPSU w!JNQPSUઌΛల։͢Δ w!JNQPS!JNQP!JNQ!JN!J
ϒϩάύʔπͷ944ରࡦ wϗϫΠτϦετܗࣜ wIUUQTNFUBDQBOPSHSFMFBTF )5.-8JEHFU7BMJEBUPS
ϒϩάύʔπͷ944ରࡦ wϒϩάόʔπࣗʹ੬ऑੑ͕͋Δ wυϝΠϯࣦޮˠѱҙΛ࣋ͬͨ+4࣮ߦ
944ରࡦৄ͘͠ wϔϧϓͯͳμΠΞϦʔ944ରࡦ wIUUQIBUFOBEJBSZHIBUFOBOFKQ LFZXPSEͯͳμΠΞϦʔ944ରࡦ
ͯͳͱݴ͑944
None
ͯͳϒϩά wϦϦʔε wIUUQIBUFOBCMPHDPN w IBUFOBOFKQ͡Όͳ͍ॳͷຊαʔϏε w+4ϑϦʔ
ϔομͷJGSBNFԽ iframe blog.hatena.ne.jp onishi.hatenablog.com
ͦͷฤू
ͦͷฤू
ΫϩευϝΠϯ௨৴ wXJOEPXQPTU.FTTBHF wΟϯυ ϑϨʔϜ ؒͰϝοηʔδͷ ૹड৴Λߦ͏ͨΊͷΈ // message Πϕϯτࢹ
window.addEventListener(“message”, function() {...}, false); // message ૹ৴ window.postMessage(data, “targetOrigin”);
ΫϩευϝΠϯ௨৴ wQPTU.FTTBHFඇରԠϒϥβ ݹ͍*& wMPDBUJPOIBTIʹΑΔυϝΠϯؒ௨৴ wϑϨʔϜͷMPDBUJPOIBTIॻ͖͑ wϑϨʔϜMPDBUJPOIBTIͷมԽ Λࢹ w5$1෩σʔλ௨৴ w63-੍ݶ
*&ͰόΠτ ʹΑΔύ έοτׂ
ΫϩευϝΠϯ௨৴ͷར༻ wͦͷฤू wӾཡऀͷฤूݖݶ֬ೝ wͯͳελʔ wίϝϯτ w௨ wϑΟʔυόοΫϑΥʔϜ
αʔυύʔςΟ$PPLJF wJGSBNFTDSJQUཁૉͰຒΊࠐ·Εͨ ֎෦Ϧιʔεʹ$PPLJFΛૹ৴͢Δ͔ w'JSFGPY͔ΒσϑΥϧτ0'' wJGSBNFʹΑΔΫϩευϝΠϯ௨৴͕ ͑ͳ͍
αʔυύʔςΟ$PPLJF0''ରࡦ wCMPHIBUFOBOFKQυϝΠϯͷ"1*Ξ ΫηεDPPLJFૹ৴͋Δ͔νΣοΫ wJGSBNF͔ΒXJOEPXPQFOʹ͢Δ wϢʔβʔใ͕औΕͳ͍ͷͰସ ใΛදࣔ͢Δ
JGSBNF
JGSBNF
XJOEPXPQFO
ସϔομ
ΞΫηείϯτϩʔϧ wϒϩάͷϓϥΠϕʔτ wೝূͷΈͷෳࡶԽ w֎෦ͷιʔγϟϧάϥϑೝূ wηογϣϯϋΠδϟοΫࢭ wϒϩάຖʹผυϝΠϯ wผϢʔβʔʹ࿙ΕͯͳΔ͘ͳ͍ wηογϣϯຖʹ%#ΞΫηε͠ͳ͍
ΞΫηείϯτϩʔϧ ॳճΞΫηε࣌ͷΈೝূػ͕ؔ %#ΛҾ͘ UPLFOͰϒϩάʹϦμΠϨΫτ ϒϩάຖʹӾཡ༻DPPLJFΛൃߦ ΞΫηε࣌ʹDPPLJFͷଥੑ
ݕূͷΈ ೝূػؔ .hatena.ne.jp ϒϩά anydomain Ϣʔβʔ
ΞΫηείϯτϩʔϧ ॳճΞΫηε࣌ͷΈೝূػ͕ؔ %#ΛҾ͘ UPLFOͰϒϩάʹϦμΠϨΫτ ϒϩάຖʹӾཡ༻DPPLJFΛൃߦ ΞΫηε࣌ʹDPPLJFͷଥੑ
ݕূͷΈ ೝূػؔ .hatena.ne.jp ϒϩά anydomain Ϣʔβʔ UPLFO
ΞΫηείϯτϩʔϧ ॳճΞΫηε࣌ͷΈೝূػ͕ؔ %#ΛҾ͘ UPLFOͰϒϩάʹϦμΠϨΫτ ϒϩάຖʹӾཡ༻DPPLJFΛൃߦ ΞΫηε࣌ʹDPPLJFͷଥੑ
ݕূͷΈ ೝূػؔ .hatena.ne.jp ϒϩά anydomain Ϣʔβʔ DPPLJF
ΞΫηείϯτϩʔϧ ॳճΞΫηε࣌ͷΈೝূػ͕ؔ %#ΛҾ͘ UPLFOͰϒϩάʹϦμΠϨΫτ ϒϩάຖʹӾཡ༻DPPLJFΛൃߦ ΞΫηε࣌ʹDPPLJFͷଥੑ
ݕূͷΈ ೝূػؔ .hatena.ne.jp ϒϩά anydomain Ϣʔβʔ
ΫϦοΫδϟοΩϯάରࡦ w9'SBNF0QUJPOT%&/: wϑϨʔϜ༻ͷཁૉ໌ࣔతʹڐՄ wͦͷ߹ɺ*/165ཁૉͷมߋΛࢹ
ΫϦοΫδϟοΩϯάରࡦ
·ͱΊ wͯͳμΠΞϦʔ wIBUFOBOFKQυϝΠϯͳͷͰపఈ͠ ͨϗϫΠτϦετରࡦ wͯͳϒϩά wಠࣗυϝΠϯ ΫϩευϝΠϯ௨৴
ਓࡐืू wגࣜձࣾͯͳͰΤϯδχΞͦͷଞ શ৬छΛืू͍ͯ͠·͢ wҰॹʹϒϩάΛ࡞Γ·͠ΐ͏ʂ www.hatena.ne.jp/company/staff
αϚʔΠϯλʔϯ w िؒ w8FCαʔϏε։ൃίʔε໊ఔ wେنγεςϜݚڀίʔε໊ఔ wۙʑืू։࢝͠·͢ʂʂ developer.hatenastaff.com