CVE-2020-15229

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Due to insecure handling of path traversal and the lack of path sanitization within `unsquashfs`, it is possible to overwrite/create any files on the host filesystem during the extraction with a crafted squashfs filesystem. The extraction occurs automatically for unprivileged (either installation or with `allow setuid = no`) run of Singularity when a user attempt to run an image which is a local SIF image or a single file containing a squashfs filesystem and is coming from remote sources `library://` or `shub://`. Image build is also impacted in a more serious way as it can be used by a root user, allowing an attacker to overwrite/create files leading to a system compromise, so far bootstrap methods `library`, `shub` and `localimage` are triggering the squashfs extraction. This issue is addressed in Singularity 3.6.4. All users are advised to upgrade to 3.6.4 especially if they use Singularity mainly for building image as root user. There is no solid workaround except to temporary avoid to use unprivileged mode with single file images in favor of sandbox images instead. Regarding image build, temporary avoid to build from `library` and `shub` sources and as much as possible use `--fakeroot` or a VM for that."}, {"lang": "es", "value": "Singularity (una plataforma de contenedores de c\u00f3digo abierto) desde la versi\u00f3n 3.1.1 hasta la 3.6.3, presenta una vulnerabilidad. Debido al manejo no seguro de un salto de ruta y la falta de saneamiento de rutas dentro de \"unsquashfs\", es posible sobrescribir y crear cualquier archivo en el sistema de archivos del host durante la extracci\u00f3n con un sistema de archivos squashfs dise\u00f1ado. La extracci\u00f3n ocurre autom\u00e1ticamente para una ejecuci\u00f3n sin privilegios (ya sea de instalaci\u00f3n o con \"allow setuid = no\") de Singularity cuando un usuario intenta ejecutar una imagen que es una imagen SIF local o un solo archivo que contiene un sistema de archivos squashfs y proviene de fuentes remotas \"library://\" or \"shub://\". La construcci\u00f3n de la imagen tambi\u00e9n est\u00e1 afectada de una manera m\u00e1s seria, ya que puede ser usada por un usuario root, lo que permite a un atacante sobrescribir y crear archivos que conducen a un compromiso del sistema, hasta ahora los m\u00e9todos de arranque \"library\", \"shub\" y \"localimage\" est\u00e1n activando la extracci\u00f3n de squashfs. Este problema se aborda en Singularity versi\u00f3n 3.6.4. Se recomienda a todos los usuarios que actualicen a la versi\u00f3n 3.6.4, especialmente si usan Singularity principalmente para crear im\u00e1genes como usuario root. No existe una soluci\u00f3n alternativa s\u00f3lida, excepto para evitar temporalmente el uso del modo sin privilegios con im\u00e1genes de un solo archivo en lugar de im\u00e1genes de sandbox. Con respecto a la construcci\u00f3n de la imagen, evite temporalmente construir a partir de fuentes de \"library\" y \"shub\" y tanto como sea posible use \"--fakeroot\" o una m\u00e1quina virtual para eso"}], "lastModified": "2022-11-16T16:22:38.373", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EB8C4D6B-DFE7-4904-8C9C-25D5060F66BC", "versionEndIncluding": "3.6.3", "versionStartIncluding": "3.1.1"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "67E82302-4B77-44F3-97B1-24C18AC4A35D"}, {"criteria": "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B620311B-34A3-48A6-82DF-6F078D7A4493"}, {"criteria": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B009C22E-30A4-4288-BCF6-C3E81DEAF45A"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}