CVE Vulnerability

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.

5.8 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

Scope

9.3 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/hpcng/singularity/pull/5611 Patch Third Party Advisory
https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9 Third Party Advisory
https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fixes Release Notes Third Party Advisory
https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8d53e Patch Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.html Broken Link Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.html Broken Link Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.html Broken Link Mailing List
Configurations

Configuration 1

cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:*
Information

Published : 2020-10-14 07:15

Updated : 2022-11-16 04:22

NVD link : CVE-2020-15229

Mitre link : CVE-2020-15229

Products Affected
No products.
CWE
CWE-22