{"id":139980,"date":"2025-08-03T11:11:54","date_gmt":"2025-08-03T09:11:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostizhenie-vypolneniya-koda-pri-kontrole-nad-tekstom-kommentariya-v-python-skripte"},"modified":"2025-08-03T11:11:54","modified_gmt":"2025-08-03T09:11:56","slug":"dostizhenie-vypolneniya-koda-pri-kontrole-nad-tekstom-kommentariya-v-python-skripte","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/dostizhenie-vypolneniya-koda-pri-kontrole-nad-tekstom-kommentariya-v-python-skripte","title":{"rendered":"Koodi k\u00e4itamise saavutamine Python-skripti kommentaariteksti \u00fcle kontrolli all","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00dcks UIUCTF 2025 konkursi osalejatest selgitas \u00fcksikasjaliselt, kuidas talle \u00f5nnestus t\u00e4ita \u00fclesanne, mis n\u00f5udis oma koodi teostamist serveris, omades vaid v\u00f5imalust muuta koodis kommentaariteksti sisu. <\/p>\n

Osalejad said saata v\u00f5rgu p\u00e4ringu Python skripti, mis genereeris uue Python skripti juhusliku nimega, lisades kasutajalt saadud andmed kommentaari teksti, eemaldades s\u00fcmbolid ja , ning k\u00e4ivitas selle skripti k\u00e4sklusega . Ainult kommentaari sisu kontrollides pidi osaleja failist v\u00e4lja t\u00f5mbama rea. Skript loodi j\u00e4rgmise koodiga: comment = input().replace(, ).replace(, ) code = f<<<print() # See on kommentaar. Siin on veel \u00fcks: # {comment} print()>>> <\/p>\n

Kohandati {comment} osalejalt saadud andmetega, mille tulemuseks k\u00e4ivitus j\u00e4rgmine kood: print() # See on kommentaar. Siin on veel \u00fcks: # Osalejalt saadud andmed print() <\/p>\n

\u00dclesanne oli loodud CPython parsimisvea p\u00f5hjal, mis t\u00f6\u00f6tles nullkoodi s\u00fcmbolit stringi l\u00f5ppena (sellist haavatavust sai kasutada pahatahtlike tegevuste varjamiseks kommentaaride tekstis). Probleem lahendati CPython versioonides 3.12.0 ja 3.11.4. Konkursil kasutatav t\u00f6\u00f6tleja eemaldas ainult s\u00fcmbolid ja , kuid haavatava CPython versiooni kasutamisel sai osaleja kasutada s\u00fcmbolit eraldajana. Siiski see trikk ei toiminud, kuna konkursil kasutati juba parandatud versiooni CPython, lootes, et parsimises v\u00f5ivad olla veel sarnased vead, ja osalejad suudavad need tuvastada. <\/p>\n

\u00dclesande edukalt lahendanud osaleja ei hakanud otsima uusi haavatavusi parseris, mis lubaksid jagada stringe osadeks, vaid kasutas Pythonis failide t\u00e4itmise omadust vastavalt nende sisule. N\u00e4iteks v\u00f5ib .py laiendiga failis asendada algkoodi vahem\u00e4lu \u0431\u0430\u0439\u0442\u043a\u043e\u0434iga, mis on salvestatud .pyc laiendiga failidesse, ja selline fail k\u00e4ivitatakse. Antud konkursil suutis osaleja kontrollida ainult sisu failis, seet\u00f5ttu ei saanud ta lisada oma pealkirja MIME-t\u00fc\u00fcbi v\u00e4\u00e4rkohtlemiseks. <\/p>\n

Probleemi sai lahendada, kasutades seda, et Python alates versioonist 2.6 suudab t\u00e4ita ZIP-arhiivide sisu Python pakettide pakkimiseks. Nagu vahem\u00e4lu \u0431\u0430\u0439\u0442\u043aodi puhul, m\u00e4\u00e4ratakse ZIP-arhiivide olemasolu sisu, mitte faili laiuse j\u00e4rgi, st v\u00f5ib sisaldada ZIP-arhiivi ja k\u00e4ivitamisel k\u00e4suga t\u00f6\u00f6deldakse see kui komprimeeritud Python paketti. Samuti ei indekseeritud ZIP-arhiivid Pythonis faili alguses oleva p\u00e4ise j\u00e4rgi, vaid faili l\u00f5pus oleva EOCD (End of Central Directory Record) sektsiooni j\u00e4rgi. Kui arhiivis on fail , k\u00e4ivitatakse see automaatselt, kui arhiivi k\u00e4ivitatakse k\u00e4suga . <\/p>\n

Konkursi \u00fclesanne lahendati sarnase ZIP-arhiivi genereerimisega ning selle sisestamisega kommentaari tekstis. Faili struktuuri korrektsuse s\u00e4ilitamiseks, arvesse v\u00f5ttes, et algse faili l\u00f5pus on k\u00e4sk 'print()', kasutati EOCD-sektsiooni kommentaaride ala olemasolu, mis asus viimasena.

\"Koodi<\/center>
\"Koodi<\/center>
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u0434\u0438\u043d \u0438\u0437 \u0443\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u043e\u0432 \u0441\u043e\u0440\u0435\u0432\u043d\u043e\u0432\u0430\u043d\u0438\u044f UIUCTF 2025, \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b, \u043a\u0430\u043a \u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0437\u0430\u0434\u0430\u043d\u0438\u0435, \u0442\u0440\u0435\u0431\u0443\u044e\u0449\u0435\u0435 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u0438\u043c\u0435\u044f \u043b\u0438\u0448\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0442\u0435\u043a\u0441\u0442\u0430 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0432 \u043a\u043e\u0434\u0435. \u0423\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u0438 \u043c\u043e\u0433\u043b\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u043a Python-\u0441\u043a\u0440\u0438\u043f\u0442\u0443, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u043b \u043d\u043e\u0432\u044b\u0439 Python-\u0441\u043a\u0440\u0438\u043f\u0442 c\u043e \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b\u043c\u0438 \u0438\u043c\u0435\u043d\u0435\u043c, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u043b \u043f\u043e\u0441\u0442\u0443\u043f\u0438\u0432\u0448\u0438\u0435 \u043e\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0442\u0435\u043a\u0441\u0442 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f, \u0432\u044b\u0440\u0435\u0437\u0430\u0432 \u0441\u0438\u043c\u0432\u043e\u043b\u044b «\n» \u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":139981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-139980","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Koodi t\u00e4itmine kommentaariteksti kontrollimisega Python-skripti sees | ProHoster","description":"\u00dcks UIUCTF 2025 v\u00f5istluse osalejatest kirjeldas \u00fcksikasjalikult, kuidas tal \u00f5nnestus t\u00e4ita \u00fclesanne, mis n\u00f5udis oma koodi k\u00e4ivitamist serveris, omades vaid v\u00f5imalust muuta koodi kommentaariteksti sisu. Osalejad said saata v\u00f5rgu p\u00e4ringu Python-skriptile, mis h\u00f5ivas uue Python-skripti juhuslikult valitud nimega, lisades kasutajalt saadud andmed kommentaariteksti, l\u00f5igates v\u00e4lja s\u00fcmbolid \"\\n\" ja","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/dostizhenie-vypolneniya-koda-pri-kontrole-nad-tekstom-kommentariya-v-python-skripte","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0414\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0435 \u043d\u0430\u0434 \u0442\u0435\u043a\u0441\u0442\u043e\u043c \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0432 Python-\u0441\u043a\u0440\u0438\u043f\u0442\u0435 | ProHoster","og:description":"\u041e\u0434\u0438\u043d \u0438\u0437 \u0443\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u043e\u0432 \u0441\u043e\u0440\u0435\u0432\u043d\u043e\u0432\u0430\u043d\u0438\u044f UIUCTF 2025, \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b, \u043a\u0430\u043a \u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0437\u0430\u0434\u0430\u043d\u0438\u0435, \u0442\u0440\u0435\u0431\u0443\u044e\u0449\u0435\u0435 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u0438\u043c\u0435\u044f \u043b\u0438\u0448\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0442\u0435\u043a\u0441\u0442\u0430 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0432 \u043a\u043e\u0434\u0435. \u0423\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u0438 \u043c\u043e\u0433\u043b\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u043a Python-\u0441\u043a\u0440\u0438\u043f\u0442\u0443, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u043b \u043d\u043e\u0432\u044b\u0439 Python-\u0441\u043a\u0440\u0438\u043f\u0442 c\u043e \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b\u043c\u0438 \u0438\u043c\u0435\u043d\u0435\u043c, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u043b \u043f\u043e\u0441\u0442\u0443\u043f\u0438\u0432\u0448\u0438\u0435 \u043e\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0442\u0435\u043a\u0441\u0442 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f, \u0432\u044b\u0440\u0435\u0437\u0430\u0432 \u0441\u0438\u043c\u0432\u043e\u043b\u044b "\\n" \u0438","og:url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/dostizhenie-vypolneniya-koda-pri-kontrole-nad-tekstom-kommentariya-v-python-skripte","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2025-08-03T09:11:56+00:00","article:modified_time":"2025-08-03T09:11:56+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"139980","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-23 14:07:19","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2026-01-23 14:07:19","updated":"2026-01-23 14:07:19"},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/139980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/comments?post=139980"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/139980\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media\/139981"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media?parent=139980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/categories?post=139980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/tags?post=139980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}