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όάό΢ϯςΟ ೖ໳ͯ͠Έͨ no1zy

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ࣗݾ঺հ • twitter: @no1zy_sec • ৘ใܥઐ໳ֶੜ • όάϋϯλʔྺ 8ϲ݄ • ڈ೥ͷ֫ಘใ঑ۚ૯ֹ 612ສԁ

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2018೥αΠϘ΢ζใ঑੍ۚ౓ϥϯΩϯά࢑ఆ1Ґ

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όάό΢ϯςΟͱ͸ • اۀ͕੬ऑੑʹରͯ͠ό΢ϯςΟΛ͔͚ɺൃ ݟ͞Εͨ੬ऑੑͷॏཁ౓ʹԠͯ͡ใ঑ۚΛࢧ ෷͏੍౓ • HackerOne, Bugcrowd, BugBounty.jpͳͲͷ ϓϥοτϑΥʔϜ͕͋Δ

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ͳͥόάϋϯτΛ࢝Ίͨͷ͔ʁ • ϦΞϧϫʔϧυͷ੬ऑੑΛݟ͚ͭͯΈ͔ͨͬ ͨ • Ͳ͏ͤ୳͢ͳΒใ঑͕ۚग़Δํ͕͓ಘ͔ͳͬ ͯࢥͬͨ

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όάϋϯτͷखॱ 1.Recon and Content Discovery 2.Find Bug 3.Report

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1.Recon and Content Discovery

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ͳͥͦΕ͕ॏཁ͔ʁ • ݟ͚ͭʹ͍͘ϦιʔεΛ୳͢͜ͱͰ੬ऑੑΛ ൃݟͰ͖ΔՄೳੑ্͕͕Δ • αϒυϝΠϯྻڍ • APIΤϯυϙΠϯτͷൃݟ • etc…

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޿͍είʔϓͷϓϩάϥϜ͕Φεεϝ • *.example.com ←͜͏ͳ͍ͬͯΔ΋ͷ • ڱ͍είʔϓͩͱطʹ۷Γਚ͘͞Ε͍ͯΔՄ ೳੑ͕͋Δ • αϒυϝΠϯ͕ͨ͘͞Μ͋Δ΄ͲՄೳੑ΋޿ ͕Δ

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Sublist3r

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dirsearch

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relative-url-extractor

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LinkFinder

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JSParser

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Google Dorks • Googleݕࡧʹ͸ݕࡧԋࢉࢠΛ࢖༻͢Δ͜ͱ͕ Ͱ͖Δ • υϝΠϯɺϑΝΠϧλΠϓɺURLʹؚ·ΕΔจ ࣈྻͷࢦఆͳͲʹ໾ཱͭ

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Google Dorks • site - ࢦఆ͞ΕͨυϝΠϯͷwebαΠτΛݕࡧ site:www.example.com • inurl - ࢦఆ͞Εͨจࣈྻ͕URLʹؚ·ΕΔ WebαΠτΛݕࡧ inurl:callback

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Open RedirectΛ୳͢ • ϦμΠϨΫτઌʹϢʔβʔೖྗΛ࢖༻͢Δ৔ ߹ʹى͖΍͍͢ • ϦμΠϨΫτ࣌ʹΑ͘࢖ΘΕΔύϥϝʔλ໊ ΛGoogle DorksΛ࢖ͬͯݕࡧ͢Δ

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Α͘࢖༻͞ΕΔύϥϝʔλ໊ • url • uri • returnUrl • returnUri • next • nextPage • redirect • continue

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ݕࡧྫ site:example.com inurl:url

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2.Find bug

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Open Redirectͷྫ ਖ਼͍͠ϦμΠϨΫτઌ͕ҎԼͱ͢Δ https://www.example.com/foo/bar

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Filter bypass Part1 ?redirect=https://www.example.com@evil.com

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Filter bypass Part2 ?redirect=///evil.com

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Filter bypass Part3 ?redirect=\/\/evil.com

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DOM Based XSSͷྫ JSϑΝΠϧͷSink͔ΒSourceΛḷ͍ͬͯ͘

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ॏ఺తʹݟΔ৔ॴ Source: • location.href • location.pathname • location.hash • location.search Sink: • innerHTML() • eval() • document.write() • location.replace()

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SSRFͷྫ ϝʔϧαʔόʔઃఆػೳʹ೚ҙͷURLΛࢦఆ Ͱ͖Δͱ͢Δ

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SSRFͷྫ αʔόʔઃఆػೳ͸೚ҙͷαʔόʔΛࢦఆͰ ͖ΔΑ͏ʹઃܭ͞Ε͍ͯΔ͜ͱ͕ଟ͍ͷͰ SSRF͕ى͜Γ΍͍͢ɻ

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Request host=127.0.0.1:22

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Response IOException: Unexpected response: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4

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Request host=127.0.0.1:9999

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Response AuthenticationFailedException: Read timed out

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SSRFͷྫ Τϥʔϝοηʔδʹදࣔ͞ΕΔจࣈྻͷࠩҟʹΑͬ ͯ443'ʹΑΔϙʔτεΩϟϯ 941" ͕੒ޭͯ͠ ͍Δ͔൑அ͢Δ͜ͱ͕Ͱ͖Δ৔߹͕͋Δ

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3.Report

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Golden Rule • ࣗ෼͕઀͞Ε͍ͨଶ౓Ͱ઀͢Δ • ใࠂͨ͠Ϩϙʔτ͕ͲͷΑ͏ʹײ͡ΒΕΔ͔ ߟ͑Δ • ϦεϖΫτ͕େ੾ • ։ൃऀʹ޲͚ͯॻ͘ɻಡΜͰ͍Δਓ͕ηΩϡ ϦςΟٕज़ऀͱ͸ݶΒͳ͍

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ͳͥͦΕ͕ॏཁͳͷ͔ʁ ྑ͍ใࠂॻ͕ॻ͔Ε͍ͯΔͱ • ೝఆ·Ͱͷ͕࣌ؒૣ͍ • ϓϩάϥϜͷΦʔφʔ͸ใࠂऀͷ͜ͱΛ֮͑ ͍ͯΔ • ࠶ݱੑͷ໰୊Ͱ࣌ؒΛແବʹ͠ͳͯ͘ࡁΉ

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Ϩϙʔτͷ࡞੒͸೉͘͠ͳ͍ • ӳޠ͸Google຋༁ͰͳΜͱ͔ͳΔ • ͍͍ͩͨͷϓϥοτϑΥʔϜ͸Markdown͕ ࢖͑Δ

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ใࠂॻͷߏ੒ͷྫ 1.Description - ੬ऑੑͷઆ໌ • ͲΜͳػೳ? • Ͳ͏͍ͬͨ੬ऑੑ? 2.Step to Reproduce - ࠶ݱखॱ • Ұૢ࡞Ұखॱ͕Θ͔Γ΍͘͢ॻ͘ίπ 3.Impact - ڴҖ • ͜ͷ੬ऑੑʹΑͬͯԿ͕৵֐͞ΕΔͷ͔Λઆ໌͢Δ

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PoCΛඞͣఴ෇͢Δ • ࠶ݱ͢ΔPayload෇͖ͷURL • εΫϦʔϯγϣοτ͔ಈը͸ຖճఴ෇͓ͯ͠ ͘ͱೝఆ·Ͱͷ͕࣌ؒૣ͍ • ࠶ݱ؀ڥ΋هࡌ͓ͯ͘͠ͱGood

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όάΛൃݟ͢Δٕज़ͷֶͼํ

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৘ใऩू͕େ੾ • Twitterͷϋογϡλάͷ؂ࢹ • όάϋϯλʔͷϒϩά΍SNSΞΧ΢ϯτ • HackerOneͷϨϙʔτ • όάϋϯλʔҭ੒ϓϩδΣΫτͷ׆༻

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Twttierϋογϡλά • #bugbounty • #bugbountytips OR #bugbountytip

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HackerOneͷϨϙʔτΛಡΉ • HackerOne͸ใࠂ͞Εͨ੬ऑੑ͕ެ։͞Εͯ ͍Δ͜ͱ͕͋Δ • ެ։͞Ε͍ͯΔใࠂΛಡΉ͜ͱͰ੬ऑੑΛൃ ݟ͢ΔςΫχοΫ͔Βใࠂͷॻ͖ํ·ͰֶͿ ͜ͱ͕Ͱ͖Δ

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HackerOneͷϨϙʔτΛಡΉ

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όάϋϯλʔͷϒϩά΍SNSΞΧ΢ϯτ • όάϋϯλʔͷதʹ͸ൃݟͨ͠੬ऑੑ΍ςΫ χοΫΛެ։͍ͯ͠Δਓ͕͍Δ • ͦ͏͍ͬͨਓୡͷϒϩά΍εϥΠυΛಡΉ͜ ͱͰ஌ࣝ΍ؾ͖ͮΛಘΔ

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όάϋϯλʔͷϒϩά΍SNSΞΧ΢ϯτ • Frans Rosén - detectify labs • bl4de - @_bl4de • Emad Shanab - @Alra3ees • EdOverflow - edoverflow.com • INFOSEC WRITE-UPS

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όάϋϯλʔҭ੒ϓϩδΣΫτͷ׆༻ • Bugcrowd University • Hacker101

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Bugcrowd University • όάϋϯλʔΛҭ੒͢ΔΦʔϓ ϯιʔεϓϩδΣΫτ • ͞·͟·ͳ੬ऑੑΛൃݟ͢Δς ΫχοΫ͔Βྑ͍ใࠂͷఏग़ํ ๏·ͰֶͿ͜ͱ͕Ͱ͖Δ

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Hacker101 • CTFͱಈըͰֶͿ͜ͱ͕Ͱ͖ Δ • CTFͰҰఆϙΠϯτΛ௒͑Δ ͱHackerOneͷϓϥΠϕʔτ ϓϩάϥϜʹট଴ͯ͠΋Β͑ Δ

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Happy Hunting!