CVE - CVE-2020-15229

CVE-ID
CVE-2020-15229	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9 URL:https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9 MISC:https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fixes URL:https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fixes MISC:https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8d53e URL:https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8d53e MISC:https://github.com/hpcng/singularity/pull/5611 URL:https://github.com/hpcng/singularity/pull/5611 SUSE:openSUSE-SU-2020:1769 URL:http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.html SUSE:openSUSE-SU-2020:1770 URL:http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.html SUSE:openSUSE-SU-2020:1814 URL:http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.html
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20200625	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20200625)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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