{"id":"CVE-2023-30549","sourceIdentifier":"security-advisories@github.com","published":"2023-04-25T21:15:10.767","lastModified":"2026-10-23T23:10:00.157","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Apptainer is an open source container platform for Linux. There is an ext4 use-after-free flaw that is exploitable through versions of Apptainer < 1.1.0 and installations that include apptainer-suid < 1.1.8 on older operating systems where that CVE has not been patched. That includes Red Hat Enterprise Linux 7, Debian 10 buster (unless the linux-5.10 package is installed), Ubuntu 18.04 bionic and Ubuntu 20.04 focal. Use-after-free flaws in the kernel can be used to attack the kernel for denial of service and potentially for privilege escalation.\n\nApptainer 1.1.8 includes a patch that by default disables mounting of extfs filesystem types in setuid-root mode, while continuing to allow mounting of extfs filesystems in non-setuid \"rootless\" mode using fuse2fs.\n\nSome workarounds are possible. Either do not install apptainer-suid (for versions 1.1.0 through 1.1.7) or set `allow setuid = no` in apptainer.conf.  This requires having unprivileged user namespaces enabled and except for apptainer 1.1.x versions will disallow mounting of sif files, extfs files, and squashfs files in addition to other, less significant impacts.  (Encrypted sif files are also not supported unprivileged in apptainer 1.1.x.). Alternatively, use the `limit containers` options in apptainer.conf/singularity.conf to limit sif files to trusted users, groups, and/or paths, and set `allow container extfs = no` to disallow mounting of extfs overlay files.  The latter option by itself does not disallow mounting of extfs overlay partitions inside SIF files, so that's why the former options are also needed."},{"lang":"es","value":"Apptainer es una plataforma de contenedores de código abierto para Linux. Existe un fallo de uso después de liberación de ext4 que es explotable a través de versiones de Apptainer anterior a 1.1.0 e instalaciones que incluyen apptainer-suid anterior a 1.1.8 en sistemas operativos más antiguos donde ese CVE no ha sido parcheado. Eso incluye Red Hat Enterprise Linux 7, Debian 10 buster (a menos que el paquete linux-5.10 esté instalado), Ubuntu 18.04 bionic y Ubuntu 20.04 focal. Los fallos de uso después de liberación en el kernel pueden usarse para atacar el kernel para denegación de servicio y potencialmente para escalada de privilegios.\n\nApptainer 1.1.8 incluye un parche que por defecto deshabilita el montaje de tipos de sistema de archivos extfs en modo setuid-root, mientras continúa permitiendo el montaje de sistemas de archivos extfs en modo no-setuid 'rootless' usando fuse2fs.\n\nAlgunas soluciones alternativas son posibles. O no instale apptainer-suid (para versiones 1.1.0 a 1.1.7) o establezca 'allow setuid = no' en apptainer.conf. Esto requiere tener habilitados los espacios de nombres de usuario sin privilegios y, excepto para las versiones de apptainer 1.1.x, deshabilitará el montaje de archivos sif, archivos extfs y archivos squashfs, además de otros impactos menos significativos. (Los archivos sif cifrados tampoco son compatibles sin privilegios en apptainer 1.1.x.). Alternativamente, use las opciones 'limit containers' en apptainer.conf/singularity.conf para limitar los archivos sif a usuarios, grupos y/o rutas de confianza, y establezca 'allow container extfs = no' para deshabilitar el montaje de archivos de superposición extfs. Esta última opción por sí misma no deshabilita el montaje de particiones de superposición extfs dentro de los archivos SIF, por lo que las opciones anteriores también son necesarias."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"apptainer","product":"apptainer","versions":[{"version":"< 1.1.8","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":4.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-03-05T18:37:22.756636Z","id":"CVE-2023-30549","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA 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