Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sylabs | Singularity | >= 3.1.1, <= 3.6.3 |
| Opensuse | Backports Sle | 15.0 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.htmlBroken LinkMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.htmlBroken LinkMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.htmlBroken LinkMailing ListThird Party Advisory
- https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fRelease NotesThird Party Advisory
- https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8PatchThird Party Advisory
- https://github.com/hpcng/singularity/pull/5611PatchThird Party Advisory
- https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.htmlBroken LinkMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.htmlBroken LinkMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.htmlBroken LinkMailing ListThird Party Advisory
- https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fRelease NotesThird Party Advisory
- https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8PatchThird Party Advisory
- https://github.com/hpcng/singularity/pull/5611PatchThird Party Advisory
- https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9Third Party Advisory
FAQ
What is CVE-2020-15229?
CVE-2020-15229 is a vulnerability with a CVSS score of 8.2 (HIGH). 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`, ...
How severe is CVE-2020-15229?
CVE-2020-15229 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-15229?
Check the references section above for vendor advisories and patch information. Affected products include: Sylabs Singularity, Opensuse Backports Sle, Opensuse Leap.