Vulnerability Report

CVE-2020-15229

Title: Sylabs Singularity Path Traversal / LFI

Path Traversal / LFI

Proof Of Concept

No public PoC currently indexed for CVE-2020-15229.

CWE Category CWE-22
Published Date Oct 14, 2020
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 8.2 CVSS v3.1
Exploit Probability (EPSS)
2.02%

Vulnerability Summary

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.

Impacted Vendors

S
sylabs 1
O
opensuse 1

Reference Links

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.html http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.html https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fixes https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8d53e https://github.com/hpcng/singularity/pull/5611 https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9 http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00070.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00071.html http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00009.html https://github.com/hpcng/singularity/blob/v3.6.4/CHANGELOG.md#security-related-fixes https://github.com/hpcng/singularity/commit/eba3dea260b117198fdb6faf41f2482ab2f8d53e https://github.com/hpcng/singularity/pull/5611 https://github.com/hpcng/singularity/security/advisories/GHSA-7gcp-w6ww-2xv9
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.2
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
5.8
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:P/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2020-15229 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

Affected Stack

No specific products linked.