CVE-2020-15229

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Summary

CVECVE-2020-15229
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-10-14 19:15:00 UTC
Updated2022-11-16 16:22:00 UTC
DescriptionSingularity (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.

Risk And Classification

Problem Types: CWE-22

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Opensuse Backports Sle 15.0 sp2 All All
Operating System Opensuse Leap 15.1 All All All
Operating System Opensuse Leap 15.2 All All All
Application Sylabs Singularity All All All All

References

ReferenceSourceLinkTags
Merge pull request #5611 from dctrud/36-sec · hpcng/singularity@eba3dea · GitHub MISC github.com Patch, Third Party Advisory
[security-announce] openSUSE-SU-2020:1769-1: important: Security update SUSE lists.opensuse.org
[security-announce] openSUSE-SU-2020:1814-1: important: Security update SUSE lists.opensuse.org
Merge GHSA-7gcp-w6ww-2xv9 fixes for release 3.6.4 by dctrud · Pull Request #5611 · hpcng/singularity · GitHub MISC github.com Patch, Third Party Advisory
singularity/CHANGELOG.md at v3.6.4 · hpcng/singularity · GitHub MISC github.com Release Notes, Third Party Advisory
[security-announce] openSUSE-SU-2020:1770-1: important: Security update SUSE lists.opensuse.org
Path traversal and files overwrite with unsquashfs · Advisory · hpcng/singularity · GitHub CONFIRM github.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 506243 Alpine Linux Security Update for singularity
  • 983828 Go (go) Security Update for github.com/sylabs/singularity (GHSA-7gcp-w6ww-2xv9)
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