Sylabs Singularity

Apptainer is an open source container platform for Linux

CVE-2023-30549 7.8 - High - April 25, 2023

Apptainer is an open source container platform for Linux. There is an ext4 use-after-free flaw that is exploitable through versions of Apptainer < 1.1.0 and installations that include apptainer-suid < 1.1.8 on older operating systems where that CVE has not been patched. That includes Red Hat Enterprise Linux 7, Debian 10 buster (unless the linux-5.10 package is installed), Ubuntu 18.04 bionic and Ubuntu 20.04 focal. Use-after-free flaws in the kernel can be used to attack the kernel for denial of service and potentially for privilege escalation. Apptainer 1.1.8 includes a patch that by default disables mounting of extfs filesystem types in setuid-root mode, while continuing to allow mounting of extfs filesystems in non-setuid "rootless" mode using fuse2fs. Some workarounds are possible. Either do not install apptainer-suid (for versions 1.1.0 through 1.1.7) or set `allow setuid = no` in apptainer.conf. This requires having unprivileged user namespaces enabled and except for apptainer 1.1.x versions will disallow mounting of sif files, extfs files, and squashfs files in addition to other, less significant impacts. (Encrypted sif files are also not supported unprivileged in apptainer 1.1.x.). Alternatively, use the `limit containers` options in apptainer.conf/singularity.conf to limit sif files to trusted users, groups, and/or paths, and set `allow container extfs = no` to disallow mounting of extfs overlay files. The latter option by itself does not disallow mounting of extfs overlay partitions inside SIF files, so that's why the former options are also needed.

Dangling pointer

Sylabs Singularity Enterprise through 1.6.2 has Insufficient Entropy in a nonce.

CVE-2021-33027 9.8 - Critical - July 19, 2021

Sylabs Singularity Enterprise through 1.6.2 has Insufficient Entropy in a nonce.

Insufficient Entropy

Sylabs Singularity 3.5.x and 3.6.x

CVE-2021-33622 9.8 - Critical - June 15, 2021

Sylabs Singularity 3.5.x and 3.6.x, and SingularityPRO before 3.5-8, has an Incorrect Check of a Function's Return Value.

Improper Check for Unusual or Exceptional Conditions

Singularity is an open source container platform

CVE-2021-32635 6.3 - Medium - May 28, 2021

Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys.

Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image

CVE-2021-29136 5.5 - Medium - April 06, 2021

Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.

Improper Input Validation

Singularity (an open source container platform) from version 3.1.1 through 3.6.3 has a vulnerability

CVE-2020-15229 9.3 - Critical - October 14, 2020

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.

Directory traversal

Sylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user namespace container execution.

CVE-2020-25039 8.1 - High - September 16, 2020

Sylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user namespace container execution.

Incorrect Permission Assignment for Critical Resource

Sylabs Singularity through 3.6.2 has Insecure Permissions on temporary directories used in explicit and implicit container build operations

CVE-2020-25040 8.8 - High - September 16, 2020

Sylabs Singularity through 3.6.2 has Insecure Permissions on temporary directories used in explicit and implicit container build operations, a different vulnerability than CVE-2020-25039.

Incorrect Permission Assignment for Critical Resource

Sylabs Singularity 3.0 through 3.5 has Improper Validation of an Integrity Check Value

CVE-2020-13845 7.5 - High - July 14, 2020

Sylabs Singularity 3.0 through 3.5 has Improper Validation of an Integrity Check Value. Image integrity is not validated when an ECL policy is enforced. The fingerprint required by the ECL is compared against the signature object descriptor(s) in the SIF file, rather than to a cryptographically validated signature.

Improper Verification of Cryptographic Signature

Sylabs Singularity 3.5.0 through 3.5.3 fails to report an error in a Status Code.

CVE-2020-13846 7.5 - High - July 14, 2020

Sylabs Singularity 3.5.0 through 3.5.3 fails to report an error in a Status Code.

Sylabs Singularity 3.0 through 3.5 lacks support for an Integrity Check

CVE-2020-13847 7.5 - High - July 14, 2020

Sylabs Singularity 3.0 through 3.5 lacks support for an Integrity Check. Singularity's sign and verify commands do not sign metadata found in the global header or data object descriptors of a SIF file.

Improper Validation of Integrity Check Value

Insecure permissions (777) are set on $HOME/.singularity when it is newly created by Singularity (version

CVE-2019-19724 7.5 - High - December 18, 2019

Insecure permissions (777) are set on $HOME/.singularity when it is newly created by Singularity (version from 3.3.0 to 3.5.1), which could lead to an information leak, and malicious redirection of operations performed against Sylabs cloud services.

Incorrect Default Permissions

An issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host system (e.g

CVE-2019-11328 8.8 - High - May 14, 2019

An issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host system (e.g. ssh) could exploit this vulnerability due to insecure permissions allowing a user to edit files within `/run/singularity/instances/sing/<user>/<instance>`. The manipulation of those files can change the behavior of the starter-suid program when instances are joined resulting in potential privilege escalation on the host.

Incorrect Permission Assignment for Critical Resource

Sylabs Singularity 2.4 to 2.6

CVE-2018-19295 7.8 - High - December 17, 2018

Sylabs Singularity 2.4 to 2.6 allows local users to conduct Improper Input Validation attacks.

Improper Input Validation

Singularity 2.3.0 through 2.5.1 is affected by an incorrect access control on systems supporting overlay file system

CVE-2018-12021 6.5 - Medium - July 05, 2018

Singularity 2.3.0 through 2.5.1 is affected by an incorrect access control on systems supporting overlay file system. When using the overlay option, a malicious user may access sensitive information by exploiting a few specific Singularity features.

Information Disclosure