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脆弱性報奨金制度との付き合い方
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Atsushi Takayama
July 01, 2017
Technology
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脆弱性報奨金制度との付き合い方
YAPC::Fukuoka 2017のLTでの発表内容です。
Atsushi Takayama
July 01, 2017
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Transcript
੬ऑੑใ੍ۚͱͷ ͖߹͍ํ YAPC::Fukuoka LT
ࣗݾհ ߴࢁ @edvakf ϐΫγϒגࣜձࣾ CTO ݉ ԬΦϑΟε্ཱͪ͛୲
None
ຊεϥΠυͰBugBounty.jpʹ͍ͭͯଟ͘ݴٴ͠ ͍ͯ·͕͢ɺ୯ͳΔ1Ϣʔβʔͱͯ͠ͷҙݟͰ͋ ΓɺͦΕҎ্ͷརؔ·ͬͨ͋͘Γ·ͤΜ
Τϥ͍ਓ ʮηΩϡϦςΟϦεΫͱ͔ා͍͠ɺ ଟগख͔͚͍͍͔ؒͯΒઈର҆શʹͬͯͶʯ
ηΩϡϦςΟϦεΫΛݮΒ͍ͨ͠ ܦӦऀݱɺηΩϡϦςΟΛܰࢹ͍ͨ͠ͱ ࢥͬͯͳ͍ ηΩϡϦςΟʹ͔͚Δ͖దͳίετ͕Θ͔Βͳ ͍ 100%Λࢦͦ͏ͱ͢Δͱແݶʹίετ͕͔͔Δ ։ൃΛ٘ਜ਼ʹͨ͘͠ͳ͍
ԑ͋ͬͯɺpixivͰ BugBounty.jpΛར༻͢Δ͜ͱʹͳΓ·ͨ͠
BugBounty.jpͳΒͰͷར
ಋೖίετ͕ݶΓͳ͍͘ ੬ऑੑใࠂ૭ޱͳͲͷγεςϜΛ࡞Βͳͯ͘ྑ͍ ηΩϡϦςΟ୲ऀઐνʔϜΛ࡞Βͳͯ͘ ࢝ΊΒΕΔ ʢཁ߲΄΅ؙ͛ͯ͠࡞ͬͯΒͬͨʣ
ৼΓࠐΈ·ΘΓΛؙ͛Ͱ͖Δ ϖʔύʔϫʔΫͱ͔ ւ֎ૹۚͱ͔ دۚʹ·ͭΘΔ๏ͱ͔ →ߟ͑ͨ͘ͳ͍ʂʂ
੬ऑੑใۚӡ༻৬ਓͷ ͓ࣄ
ใࠂͷਫ਼ࠪ ࠶ݱ͢Δ͔ ߈ܸ༰қ͔ ӨڹൣғͲͷ͙Β͍͔ ཁ߲Λຬ͍ͨͯ͠Δ͔ աڈͷใࠂͱॏෳͰͳ͍͔ मਖ਼ͷํΛཱͯͯissueԽ ؆୯ͳΒͦͷͰमਖ਼ લճཱͯͨissueͰ͕ٞਐΜͰ͍ ΕࢀՃ
ใֹۚͷܾఆʢޙड़ʣ ใֹۚදͷߋ৽ ෦Ͱͬ͘͟ΓܾΊ͍ͯΔ ຊެ։ͨ͠΄͏͕ྑ͍ͱࢥ͏ ج४ͷमਖ਼ ੬ऑੑͰͳ͍ͷج४Ͱ໌֬Խ ͨ͠΄͏͕ ͳ͔ͳ͔Ͱ͖͍ͯͳ͍
ͦΕͳΓʹߴͳஅ͕ඞཁ
ݱࡏ୲ऀ2ਓʢCTOͱϦʔυΤϯδχΞʣͰ िʹ1࣌ؒఔΛׂ͍͍ͯΔ ଞνʔϜʹमਖ਼Λཁٻ͍ͯ͘͠ύϫʔඞཁ ͜ΕҎ্ͷใࠂΛॲཧ͢Δʹࣾͷମ੍Λ͏ ͪΐͬͱ͑ͳ͍ͱ͍͚ͳ͍͔ͳͱ͍͏ॴײ →࠷ॳదʹܾΊͨใ͕ۚͩͬͨɺใࠂΛ૿ ͨ͢ΊʹҰҾ্͖͛ͨ
దͳใֹۚΛܾΊΔ
ʮ߈ܸ͢ΔΑΓใࠂͨ͠΄͏͕ ཧʹ͔ͳ͏ఔʯ
ແཧے
ϐΫγϒͰ
ձࣾͱͯ͠దͱࢥ͏ൣғͰ্ݶઃఆ͢Εྑ͍ ηΩϡϦςΟϦεΫاۀͷϒϥϯυѻ͍ͬͯΔ σʔλʹΑ༷ͬͯʑͳͷͰ ։ൃମ੍ͷதͰରԠ͍͚ͯ͠Δͪΐ͏Ͳྑ͍ྔͷใ ࠂ͕དྷΔΑ͏ʹɺधཁͱڙڅͷόϥϯεΛऔΔ िʹ݅ ࣾٞͱͯ͠ɺʮຖ݄͍͍ͩͨ͜ͷ͙Β͍ͷۚ ֹͰΓ·͢ʯͱ͍͏༰ʹͳ͍ͬͯΔ
෦తͳʮ͓͓Αͦͷج४ʯΛܾΊͯɺͦΕͱͷ ૬ରతͳൺֱͰใֹۚΛܾఆ͍ͯ͠Δ ج४Λެ։͠ɺߋ৽͍ͯͬͨ͠΄͏͕ใࠂऀʹ ʢͰ͖ͯͳ͍ʣ CVSSΛࢀߟʹͯ͠Α͍ʢͯ͠ͳ͍ʣ https://www.ipa.go.jp/security/vuln/CVSSv3.html
ଞͷྫʢGoogleʣ https://www.google.com/about/appsecurity/reward-program/
ใࠂͷ༁
શใࠂͷ͏ͪɺ60ʙ70%Λ੬ऑੑೝఆ͠ɺͦͷ༁ʢॴײʣ ϩάΠϯηογϣϯʹ·ͭΘΔ༷ͷෆඋɿ20% ΦʔϓϯϦμΠϨΫλΫϦοΫδϟοΩϯάͷΑ͏ͳɺϑΟο γϯάʹܨ͕Δ੬ऑੑʢʁʣɿ20% HTTPϔομʔͷෆඋɿ20% ϑϨʔϜϫʔΫͷطͷ੬ऑੑɿ10% XSSͳͲɿ10% ͦͷଞɿ20%
ਖ਼໘ͳέʔε͋Δ
ݒ೦ແ͘ͳ͍
ࣾͷਓ͕ಗ໊Ͱ੬ऑੑใࠂ͖ͯͨ͠Β… γεςϜతʹ͛ͳͦ͞͏
ͱ͍͑ɺ ͱͯࢀߟʹͳΔใࠂ
1͖ͬͯͯɺ࠷ߴֹۚΛͬͨͷ4ճ pngʹِͨ͠psϑΝΠϧΛʢ͝ʹΐ͝ʹΐʣ ಛఆͷURLΛ։͔ͤΔ͚ͩͰʢ͝͝ʣ ଞਓͷอଘͨ͠σʔλΛʢ͛;Μ͛;Μʣ Flash༻ͷݹ͍APIͰʢ͋ʔ͏ʔʣ
ใࠂऀͷଚܟॏཁ
·ͨใࠂ͍ͨ͠ɺͱࢥͬͯΒ͏ͨΊʹ ͳΔ͘ૣͯ͘త֬ͳฦ৴Λ৺͕͚Δ ੬ऑੑͰͳ͍ͱஅͨ͠ΓɺॏෳͰ͋ͬͯɺ ࢀߟʹͳͬͨ߹ੵۃతʹใۚΛࢧ͏ ࣦྱʹͳΒͳ͍ݴ༿ݣ͍ ใࠂͷ͙Β͍ӳޠͳͷͰɺӳޠͰͷద ͳදݱʹ໎͏͜ͱ͕͋Δ
·ͱΊ
BugBounty.jpΛͬͯॳظίετΛ͑ͯ੬ऑੑใ ੍ۚΛ࢝Ί·ͨ͠ ӡ༻ͷखؒͦΕͳΓʹ͔͔͍ͬͯΔ ͱݴͬͯਫ਼͕ࠪि1࣌ؒఔ+मਖ਼ίετ͙Β͍ ใֹۚɺग़ͤΔൣғ+ॲཧͰ͖ΔൣғͰΔͷ͕ ྑ͍ͷͰ ใࠂऀͷํʑʹେมײँ͍ͯ͠·͢