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バグバウンティ入門してみた /Getting started with Bug Bounty
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no1zy
February 23, 2019
14
4.6k
バグバウンティ入門してみた /Getting started with Bug Bounty
元祖 濱せっく #2での発表資料
no1zy
February 23, 2019
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Transcript
όάόϯςΟ ೖͯ͠Έͨ no1zy
ࣗݾհ • twitter: @no1zy_sec • ใܥઐֶੜ • όάϋϯλʔྺ 8ϲ݄ •
ڈͷ֫ಘใۚ૯ֹ 612ສԁ
2018αΠϘζใ੍ۚϥϯΩϯάఆ1Ґ
όάόϯςΟͱ • اۀ͕੬ऑੑʹରͯ͠όϯςΟΛ͔͚ɺൃ ݟ͞Εͨ੬ऑੑͷॏཁʹԠͯ͡ใۚΛࢧ ͏੍ • HackerOne, Bugcrowd, BugBounty.jpͳͲͷ ϓϥοτϑΥʔϜ͕͋Δ
ͳͥόάϋϯτΛ࢝Ίͨͷ͔ʁ • ϦΞϧϫʔϧυͷ੬ऑੑΛݟ͚ͭͯΈ͔ͨͬ ͨ • Ͳ͏ͤ୳͢ͳΒใ͕ۚग़Δํ͕͓ಘ͔ͳͬ ͯࢥͬͨ
όάϋϯτͷखॱ 1.Recon and Content Discovery 2.Find Bug 3.Report
1.Recon and Content Discovery
ͳͥͦΕ͕ॏཁ͔ʁ • ݟ͚ͭʹ͍͘ϦιʔεΛ୳͢͜ͱͰ੬ऑੑΛ ൃݟͰ͖ΔՄೳੑ্͕͕Δ • αϒυϝΠϯྻڍ • APIΤϯυϙΠϯτͷൃݟ • etc…
͍είʔϓͷϓϩάϥϜ͕Φεεϝ • *.example.com ←͜͏ͳ͍ͬͯΔͷ • ڱ͍είʔϓͩͱطʹ۷Γਚ͘͞Ε͍ͯΔՄ ೳੑ͕͋Δ • αϒυϝΠϯ͕ͨ͘͞Μ͋Δ΄ͲՄೳੑ ͕Δ
Sublist3r
dirsearch
relative-url-extractor
LinkFinder
JSParser
Google Dorks • GoogleݕࡧʹݕࡧԋࢉࢠΛ༻͢Δ͜ͱ͕ Ͱ͖Δ • υϝΠϯɺϑΝΠϧλΠϓɺURLʹؚ·ΕΔจ ࣈྻͷࢦఆͳͲʹཱͭ
Google Dorks • site - ࢦఆ͞ΕͨυϝΠϯͷwebαΠτΛݕࡧ site:www.example.com • inurl -
ࢦఆ͞Εͨจࣈྻ͕URLʹؚ·ΕΔ WebαΠτΛݕࡧ inurl:callback
Open RedirectΛ୳͢ • ϦμΠϨΫτઌʹϢʔβʔೖྗΛ༻͢Δ ߹ʹى͖͍͢ • ϦμΠϨΫτ࣌ʹΑ͘ΘΕΔύϥϝʔλ໊ ΛGoogle DorksΛͬͯݕࡧ͢Δ
Α͘༻͞ΕΔύϥϝʔλ໊ • url • uri • returnUrl • returnUri •
next • nextPage • redirect • continue
ݕࡧྫ site:example.com inurl:url
2.Find bug
Open Redirectͷྫ ਖ਼͍͠ϦμΠϨΫτઌ͕ҎԼͱ͢Δ https://www.example.com/foo/bar
Filter bypass Part1 ?redirect=https://
[email protected]
Filter bypass Part2 ?redirect=///evil.com
Filter bypass Part3 ?redirect=\/\/evil.com
DOM Based XSSͷྫ JSϑΝΠϧͷSink͔ΒSourceΛḷ͍ͬͯ͘
ॏతʹݟΔॴ Source: • location.href • location.pathname • location.hash • location.search
Sink: • innerHTML() • eval() • document.write() • location.replace()
SSRFͷྫ ϝʔϧαʔόʔઃఆػೳʹҙͷURLΛࢦఆ Ͱ͖Δͱ͢Δ
SSRFͷྫ αʔόʔઃఆػೳҙͷαʔόʔΛࢦఆͰ ͖ΔΑ͏ʹઃܭ͞Ε͍ͯΔ͜ͱ͕ଟ͍ͷͰ SSRF͕ى͜Γ͍͢ɻ
Request host=127.0.0.1:22
Response IOException: Unexpected response: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4
Request host=127.0.0.1:9999
Response AuthenticationFailedException: Read timed out
SSRFͷྫ Τϥʔϝοηʔδʹදࣔ͞ΕΔจࣈྻͷࠩҟʹΑͬ ͯ443'ʹΑΔϙʔτεΩϟϯ 941" ͕ޭͯ͠ ͍Δ͔அ͢Δ͜ͱ͕Ͱ͖Δ߹͕͋Δ
3.Report
Golden Rule • ͕ࣗ͞Ε͍ͨଶͰ͢Δ • ใࠂͨ͠Ϩϙʔτ͕ͲͷΑ͏ʹײ͡ΒΕΔ͔ ߟ͑Δ • ϦεϖΫτ͕େ •
։ൃऀʹ͚ͯॻ͘ɻಡΜͰ͍Δਓ͕ηΩϡ ϦςΟٕज़ऀͱݶΒͳ͍
ͳͥͦΕ͕ॏཁͳͷ͔ʁ ྑ͍ใࠂॻ͕ॻ͔Ε͍ͯΔͱ • ೝఆ·Ͱͷ͕࣌ؒૣ͍ • ϓϩάϥϜͷΦʔφʔใࠂऀͷ͜ͱΛ֮͑ ͍ͯΔ • ࠶ݱੑͷͰ࣌ؒΛແବʹ͠ͳͯ͘ࡁΉ
Ϩϙʔτͷ࡞͘͠ͳ͍ • ӳޠGoogle༁ͰͳΜͱ͔ͳΔ • ͍͍ͩͨͷϓϥοτϑΥʔϜMarkdown͕ ͑Δ
ใࠂॻͷߏͷྫ 1.Description - ੬ऑੑͷઆ໌ • ͲΜͳػೳ? • Ͳ͏͍ͬͨ੬ऑੑ? 2.Step to
Reproduce - ࠶ݱखॱ • Ұૢ࡞Ұखॱ͕Θ͔Γ͘͢ॻ͘ίπ 3.Impact - ڴҖ • ͜ͷ੬ऑੑʹΑͬͯԿ͕৵͞ΕΔͷ͔Λઆ໌͢Δ
PoCΛඞͣఴ͢Δ • ࠶ݱ͢ΔPayload͖ͷURL • εΫϦʔϯγϣοτ͔ಈըຖճఴ͓ͯ͠ ͘ͱೝఆ·Ͱͷ͕࣌ؒૣ͍ • ࠶ݱڥهࡌ͓ͯ͘͠ͱGood
όάΛൃݟ͢Δٕज़ͷֶͼํ
ใऩू͕େ • Twitterͷϋογϡλάͷࢹ • όάϋϯλʔͷϒϩάSNSΞΧϯτ • HackerOneͷϨϙʔτ • όάϋϯλʔҭϓϩδΣΫτͷ׆༻
Twttierϋογϡλά • #bugbounty • #bugbountytips OR #bugbountytip
HackerOneͷϨϙʔτΛಡΉ • HackerOneใࠂ͞Εͨ੬ऑੑ͕ެ։͞Εͯ ͍Δ͜ͱ͕͋Δ • ެ։͞Ε͍ͯΔใࠂΛಡΉ͜ͱͰ੬ऑੑΛൃ ݟ͢ΔςΫχοΫ͔Βใࠂͷॻ͖ํ·ͰֶͿ ͜ͱ͕Ͱ͖Δ
HackerOneͷϨϙʔτΛಡΉ
όάϋϯλʔͷϒϩάSNSΞΧϯτ • όάϋϯλʔͷதʹൃݟͨ͠੬ऑੑςΫ χοΫΛެ։͍ͯ͠Δਓ͕͍Δ • ͦ͏͍ͬͨਓୡͷϒϩάεϥΠυΛಡΉ͜ ͱͰࣝؾ͖ͮΛಘΔ
όάϋϯλʔͷϒϩάSNSΞΧϯτ • Frans Rosén - detectify labs • bl4de -
@_bl4de • Emad Shanab - @Alra3ees • EdOverflow - edoverflow.com • INFOSEC WRITE-UPS
όάϋϯλʔҭϓϩδΣΫτͷ׆༻ • Bugcrowd University • Hacker101
Bugcrowd University • όάϋϯλʔΛҭ͢ΔΦʔϓ ϯιʔεϓϩδΣΫτ • ͞·͟·ͳ੬ऑੑΛൃݟ͢Δς ΫχοΫ͔Βྑ͍ใࠂͷఏग़ํ ๏·ͰֶͿ͜ͱ͕Ͱ͖Δ
Hacker101 • CTFͱಈըͰֶͿ͜ͱ͕Ͱ͖ Δ • CTFͰҰఆϙΠϯτΛ͑Δ ͱHackerOneͷϓϥΠϕʔτ ϓϩάϥϜʹটͯ͠Β͑ Δ
Happy Hunting!