GHSA-jv9c-w74q-6762 Insecure permissions on build temporary rootfs in Singularity

• Go github.com/sylabs/singularity: < 3.6.3 → fixed in 3.6.3

Impact Insecure permissions on temporary directories used in explicit and implicit container build operations. When a Singularity command that results in a container build operation is executed, it is possible for a user with access to the system to read the contents of the image during the build. Additionally, if the image contains a world-writable file or directory, it is possible for a user to inject arbitrary content into the running build, which in certain circumstances may enable arbitrary code execution during the build and/or when the built container is run. Patches This issue is addressed in Singularity 3.6.3. All users are advised to upgrade to 3.6.3. Workarounds The issue is mitigated if `TMPDIR` is set to a location that is only accessible to the user, as any subdirectories directly under `TMPDIR` cannot then be accessed by others. However, this is difficult to enforce so it is not recommended to rely on this as a mitigation. For more information General questions about the impact of the advisory / changes made in the 3.6.0 release can be asked in the: • Singularity Slack Channel • Singularity Mailing List Any sensitive security concerns should be directed to: [email protected] See our Security Policy here: https://sylabs.io/security-policy