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EUVD-2026-42777

fkie_cve-2020-15229

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.

GHSA-7gcp-w6ww-2xv9 — Path traversal and files overwrite with unsquashfs in singularity

Affected: Go: github.com/sylabs/singularity

### Impact

Due to insecure handling of path traversal and the lack of path sanitization within `unsquashfs` (a distribution provided utility used by Singularity), it is possible to overwrite/create any files on the host filesystem during the extraction of a crafted squashfs filesystem.

Squashfs extraction occurs automatically for unprivileged execution of Singularity (either `--without-suid` installation or with `allow setuid = no`) when a user attempts to run an image which:

- is a local SIF image or a single file containing a squashfs filesystem - is pulled from remote sources `library://` or `shub://`

Image build is also impacted in a more serious way as it is often performed by the root user, allowing an attacker to overwrite/create files leading to a system compromise. Bootstrap methods `library`, `shub` and `localimage` trigger a squashfs extraction.

### Patches

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.

### Workarounds

There is no solid workaround except to temporarily avoid use of unprivileged mode with single file images, in favor of sandbox images instead. Regarding image build, temporarily avoid building from `library` and `shub` sources, and as much as possible use `--fakeroot` or a VM to limit potential impact.

### For more information

General questions about the impact of the advisory / changes made in the 3.6.0 release can be aske…

gsd-2020-15229

openSUSE-SU-2020:1769-1 — Security update for singularity

Security update for singularity