cve-2021-37701
Vulnerability from cvelistv5
Published
2021-08-31 00:00
Modified
2024-08-04 01:23
Severity ?
8.2 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Summary
Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
References
security-advisories@github.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/npm/node-tar/security/advisories/GHSA-9r2w-394v-53qcPatch, Third Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2022/12/msg00023.htmlMailing List, Third Party Advisory
security-advisories@github.comhttps://www.debian.org/security/2021/dsa-5008Third Party Advisory
security-advisories@github.comhttps://www.npmjs.com/package/tarProduct, Third Party Advisory
security-advisories@github.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Impacted products
npmnode-tar
Show details on NVD website

To clipboard 

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Esta l\u00f3gica era insuficiente cuando se extra\u00edan archivos tar que conten\u00edan tanto un directorio como un enlace simb\u00f3lico con el mismo nombre que el directorio, donde los nombres de los enlaces simb\u00f3licos y de los directorios en la entrada del archivo usaban barras invertidas como separador de rutas en los sistemas posix. La l\u00f3gica de comprobaci\u00f3n de la cach\u00e9 usaba tanto los caracteres \\\"\\\\\\\" como \\\"/\\\" como separadores de ruta, sin embargo \\\"\\\\\\\" es un car\u00e1cter de nombre de archivo v\u00e1lido en los sistemas posix. Al crear primero un directorio, y luego sustituyendo ese directorio por un enlace simb\u00f3lico, era posible omitir las comprobaciones de enlaces simb\u00f3licos de node-tar en los directorios, permitiendo esencialmente que un archivo tar no confiable hiciera un enlace simb\u00f3lico en una ubicaci\u00f3n arbitraria y que posteriormente extrajera archivos arbitrarios en esa ubicaci\u00f3n, permitiendo as\u00ed la creaci\u00f3n y escritura excesiva arbitraria de archivos. Adem\u00e1s, una confusi\u00f3n similar podr\u00eda surgir en los sistemas de archivos que no distinguen entre may\u00fasculas y min\u00fasculas. 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  }
}


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