CVE-2021-32635

    Dashboard / Vulnerabilities / CVE-2021-32635

    CVE-2021-32635

    Published: 28 May 2021Last Modified: 27 Aug 2026

    Summary:

    Details: 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.

    References: https://github.com/sylabs/singularity/releases/tag/v3.7.4, https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394, https://security.gentoo.org/glsa/202107-50

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 47d3b5d415166bb3e0abba36c70714b53f240f70
    Fixed -None

    Affected versions

    3.7.2
    3.7.3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-32635 | CVE-DB