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オープンソースソフトウェアの脆弱性対応について

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 オープンソースソフトウェアの脆弱性対応について

実体験からの脆弱性対応〜CVE-ID発行まで

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Jun Kurihara

March 23, 2026
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  1. ιϑτ΢ΣΞͷ੬ऑੑ ݚڀͷҰ؀Ͱެ։ͨ͠ιϑτ΢ΣΞʹ͓͍ͯ΋ɺ ੬ऑੑ΁ͷରԠ͸ॏཁͳࣾձత੹೚ͷͻͱͭ ˞ऴྃͨ͠ϓϩδΣΫτͰɺ΋͏ରࡦ͠ͳ͍ Ͱ͖ͳ͍ ΋ͷ͸ɺ ͦͷࢫΛ໌ه্ͨ͠ͰzΞʔΧΠϒzͱ͢Δͱྑ͍ ϓϩάϥϜͷ࣮૷ෆ۩߹΍ઃܭϛε͕ݪҼͱͳͬͯൃੜ͢ΔαΠόʔηΩϡϦςΟ্ͷܽؕɻ ૯຿লIUUQTXXXTPVNVHPKQNBJO@TPTJLJDZCFSTFDVSJUZLPLVNJOCBTJDSJTL ˞όάҙਤ͠ͳ͍ෆ۩߹ɻˠ੬ऑੑ͸όάͷҰछ͕ͩɺશͯͷόά͕੬ऑੑͰ͸ͳ͍

    ੬ऑੑ όά όάಉ༷ɺ੬ऑੑ΁ͷ׬શͳରࡦ͸ࠔ೉ɻ࣍ʑͱ৽ͨͳ੬ऑੑ͕ൃݟ͞Ε͍ͯΔͷ͕ݱঢ়ɻ ݚڀ։ൃͰެ։ͨ͠ιϑτ΢ΣΞ΋ɺ੬ऑੑΛሃΉՄೳੑɻ lVTF BUZPVSPXOSJTLzͰ͸ࡁ·ͳ͍৔߹΋͋Δɻ޿͘αʔ Ϗε౳Ͱར༻͞Ε͍ͯͨ৔߹ɺ৘ใ࿙ӮɾαʔϏεఀࢭͳ ͲΛҾ͖ى͜͠ɺ์ஔ͢Δͱ৴པɾ৴༻Λࣦ͏͜ͱ΋ɻ
  2. ੬ऑੑରԠͷجຊϑϩʔ 044։ൃऀ Ͱ͸ɺ044ͷ੬ऑੑ͸ͲͷΑ͏ͳྲྀΕͰରॲ͢Δɾ͞ΕΔͷ͔ʁ B։ൃऀʹΑΔ ੬ऑੑͷൃݟ CୈࡾऀʹΑΔ ੬ऑੑͷൃݟใࠂ ݟ͚ͭ· ͨ͠ʂ ݟ͚ͭͯ͠

    ·ͬͨʜ ੬ऑੑͷ෼ੳධՁɾٕज़తରࡦ ύον࡞੒ ͷ࣮ࢪ • ڴҖ౓ɾۓٸ౓ͷ෼ੳධՁ FH $744੬ऑੑͷਂࠁ౓ΛධՁ͢ΔͨΊͷࢦඪ • ࠜຊతରࡦ͸Մೳ͔ʁ.JUJHBUJPO8PSL"SPVOEʹ͗͢ͳ͍͔ʁ ରࡦιϑτ΢ΣΞͷެ։ 7FS6Qɾ.JUJHBUJPO ੬ऑੑͷެ։ $7&౳ େن໛ʹར༻͞Ε͍ͯΔϥΠϒϥϦͳͲɺӨڹ͕ ڊେͳ৔߹͸ɺύονద༻༛༧Λ༩͑ΔͨΊɺؔ ܎͢Δར༻૊৫౳΁ࣄલ࿈བྷ͢Δ͜ͱ΋ɻ $7&੬ऑੑʹϢχʔΫͳ*%Λ෇༩ ޙड़ ඇެ։ϑΣʔζ ະରࡦͰͷ੬ऑੑͷެ։͸ ߈ܸΛ༠ൃ θϩσΠ߈ܸ ˠରࡦ׬ྃ·Ͱඇެ։Ͱ࣮ࢪ ެ։ϑΣʔζ
  3. 脆弱性報告を受けたとき (GitHubを例に) u ެ։ͷ৔ FH (JU)VC*TTVFT ͰใࠂΛड͚ͨ৔߹ ˠબ୒ࢶඇެ։ͷ৔΁ͷ༠ಋɾެ։৘ใͷ࡟আɾରԠ ˠબ୒ࢶ ྫ֎

    ଈ࠲ʹରԠ͕Մೳͳ৔߹ɺͦͷ··ਝ ଎ͳύον࡞੒ɾެ։ ˠ/(ɿະमਖ਼ͷ੬ऑੑΛ*TTVF্Ͱৄࡉʹٞ࿦ u ඇެ։ͷ৔ FH (JU)VC4FDVSJUZ"EWJTPSJFT()4" Ͱ ใࠂΛड͚ͨ৔߹͸ɺͦͷ··ใࠂऀͱ΍ΓऔΓͯ͠ରࡦ Λߦ͍ɺύονɾमਖ਼Λެ։ޙʹɺ੬ऑੑ৘ใΛެ։ 実際にGHSAで非公開報告を受けた例 (後述)
  4. $7& $PNNPO7VMOFSBCJMJUJFTBOE&YQPTVSFT u ૊৫"ͷग़͢੬ऑੑ৘ใͱɺ ૊৫#ͷग़͢੬ऑੑ৘ใͱ͕ɺ ಉ͡੬ऑੑʹؔ͢Δରࡦ৘ใͰ͋Δ͜ͱΛ൑அ u ରࡦ৘ใಉ࢜ͷ૬ޓࢀর΍ؔ࿈෇͚ʹར༻ ιϑτ΢ΣΞɾϥΠϒϥϦͷ੬ऑੑΛमਖ਼ͨ͠ޙʹొ࿥͢Δʮ$7&ʯͱ͸Կ͔ ඇӦརஂମͷ.*53&ࣾ

    ˞ ͕࠾൪͍ͯ͠Δ੬ऑੑͷࣝผࢠ $7&*% ɻ ੬ऑੑͷৄࡉɺରࡦํ๏ɺڴҖ౓ͱڞʹొ࿥࠾൪͞ΕΔɻ *1"IUUQTXXXJQBHPKQTFDVSJUZWVMOTDBQDWFIUNM ˞ถࠃ੓෎ͷࢿۚఀࢭͷՄೳੑ΋͋ͬͨͨΊɺࢿۚ໘Ͱಠཱͨ͠ʮ$7& 'PVOEBUJPOʯ΁Ҡߦத ʙ ૊৫" ૊৫# *%$7&YYZZ ฐࣾ੡඼ʹӨڹͷ͋ Δ$7&YYZZ͸ɺ੡ ඼ͷϚΠφʔWFSVQ ͰରࡦՄೳ ฐࣾ੡඼ʹӨڹͷ͋ ͬͨ$7&YYZZ͸ɺ ੡඼ʹϦϯΫ͢Δϥ ΠϒϥϦΛมߋ͢Ε ͹ରࡦՄೳ ʹ ҟͳΔ੡඼Ͱ΋ɺಉҰ ੬ऑੑͱͯ͠؅ཧՄೳ  ੬ऑੑʹରͯ͠ͷ৘ใ࿈ܞɾରࡦͷਝ଎Խ  ؅ཧਫ਼౓΍ɺ੬ऑੑεΩϟφ౳ͷπʔϧͷ࿈ܞੑͷ޲্  άϩʔόϧͳڴҖΠϯςϦδΣϯε ڴҖ৘ใ ͷਝ଎͔ͭ༏ઌ ౓෇ͨ͠׆༻ͷ࣮ݱ ৘ใγεςϜͷ҆৺ɾ҆શͳӡ༻Λଓ͚͍ͯͨ͘ΊͷࣾձΠϯϑϥ
  5. <࣮࿥>3VTU੡044ϥΠϒϥϦIUUQTJHST ΁ͷ੬ऑੑใࠂ $7& u (JU)VC4FDVSJUZ"EWJTPSJFT ()4"ܦ༝ ͰɺϢʔβ͔Βඇެ։ʹ ͯ੬ऑੑͷใࠂɾύονͷఏग़ u )."$ͱ͍͏҉߸ϓϦϛςΟϒ࣮૷͕ʮλΠϛϯά߈ܸʯʹ੬ऑͰ͋Δใࠂ

    u ੬ऑੑڴҖ౓ɿ.PEFSBUF u ()4"্ʹͯɺඇެ։ʹͯύονͷϨϏϡʔɾ੬ऑੑΛ֬ೝ u ύονͷऔࠐΈ NFSHF ͱରࡦόʔδϣϯެ։ɾ੬ऑੑ৘ใͷެ։ u (JU)VCܦ༝Ͱɺ$7&*%ͷ࠾൪ґཔ u $7&*%࠾൪ɾެ։ IUUQTHJUIVCDPNKVOLVSJIBSBIUUQTJHSTTFDVSJUZBEWJTPSJFT()4"RQHQSNSQ IUUQTXXXDWFPSH$7&3FDPSE JE$7& ͜ͷ࣌఺Ͱ()4"ͷϖ ʔδΛެ։ঢ়ଶʹมߋ ͢Δ͜ͱͰ৘ใެ։ ੬ऑੑใࠂʙରࡦ·Ͱඇެ։ɺ ͞Βʹެ։ɾ$7&*%࠾൪·Ͱۇ͔೔ؒͰߦΘΕͨɺ ࣾձతӨڹΛ࠷খݶʹͨ͠ཧ૝తͳέʔεͱݴ͑Δ ཧ૝έʔε ✔ඇެ։Ͱͷਝ଎ରԠ͕ཧ૝ ✔ใࠂऀͱͷ࿈ܞ͕ॏཁ
  6. <࣮࿥>3VTU੡044ϥΠϒϥϦIUUQTJHST ΁ͷ੬ऑੑใࠂ $7& u (JU)VC1VMM3FRVFTUʹΑΓɺϢʔβ͔Βެ։Ͱ੬ऑੑͷใࠂ ɾύονͷఏग़ u ϋογϡ஋ಉ࢜ͷ౳ՁੑͷνΣοΫ͕ɺܕͷಉҰੑνΣοΫʹͱͲ·͍ͬͯͨ u ϝοηʔδվ͟Μ͕ݕग़Ͱ͖ͳ͍ॏେͳ੬ऑੑ

    u ਝ଎ʹύονΛϨϏϡʔͨ͠΋ͷͷɺڴҖ౓͕௿͍ଞͷ੬ऑੑ ͕ൃੜ͢ΔՄೳੑΛൃݟɻҰ୴ύονΛऔࠐΜͰରࡦΛݕ౼ɻ u ৽ͨͳରࡦύονΛ࡞੒ɾऔࠐΈɾରࡦόʔδϣϯͷެ։ u ()4"ʹͯڴҖ౓Λ෼ੳɾ੬ऑੑϨϙʔτΛఏग़ɾ$7&*%ͷϦ ΫΤετΛఏग़ u $7&*%ͷ࠾൪ɾެ։ IUUQTHJUIVCDPNKVOLVSJIBSBIUUQTJHSTTFDVSJUZBEWJTPSJFT()4"WHWYSDI IUUQTXXXDWFPSH$7&3FDPSE JE$7& ຊདྷ͸ඇެ։ͰରԠ ͢΂͖ɻ ΍ΉΛಘͣશͯެ։ ঢ়ଶͰҰؾʹରࡦɻ ެ։ঢ়ଶͰใࠂΛड͚औͬͯ͠·ͬͨ΋ͷͷɺରࡦόʔδϣϯެ։·Ͱ೔Ͱ׬ྃ ࣄނέʔε ✔ެ։ใࠂ͸ϦεΫ͕ߴ͍ ✔ਝ଎ରԠͰඃ֐Λ࠷খԽՄೳ