Singularity (an open source container platform) from version 3.1.1 through 3.6.3 has a vulnerability. 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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Singularity (an open source container platform) from version 3.1.1 through 3.6.3 has a vulnerability. 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.
    (CVE-2020-15229)

This update for singularity fixes the following issues :

Update to new version 3.6.4 :

  - CVE-2020-15229: Due to insecure handling of path     traversal and the lack of path sanitization within     unsquashfs, it is possible to overwrite/create files on     the host filesystem during the extraction of a crafted     squashfs filesystem (boo#1177901).

ID	Name	Product	Family	Severity
431930	SCA: security update for github.com/sylabs/singularity (GHSA-7gcp-w6ww-2xv9)	Tenable Cloud Security	SCA Checks	critical
431930	SCA: security update for github.com/sylabs/singularity (GHSA-7gcp-w6ww-2xv9)	Tenable Self-Hosted Container Security	SCA Checks	critical
408120	Alpine: multiple singularity packages: security update to 3.6.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
408120	Alpine: multiple singularity packages: security update to 3.6.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
400318	Alpine: singularity: security update to 3.6.3-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
400318	Alpine: singularity: security update to 3.6.3-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
142114	openSUSE Security Update : singularity (openSUSE-2020-1769)	Nessus	SuSE Local Security Checks	critical
142108	openSUSE Security Update : singularity (openSUSE-2020-1770)	Nessus	SuSE Local Security Checks	critical

Detections

Analytics

CVE-2020-15229

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Tenable Plugins

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