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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-32635)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2021-32635)

The remote host is affected by the vulnerability described in GLSA-202107-50 (Singularity: Remote code execution)

    Singularity always uses the default remote endpoint,       &lsquo;cloud.syslabs.io&rsquo;, for action commands using the &lsquo;library://&rsquo;
      URI rather than the configured remote endpoint.
  Impact :

    An attacker that that can push a malicious container to the default       remote endpoint could execute code on hosts that fetch the container.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
248537	Linux Distros Unpatched Vulnerability : CVE-2021-32635	Nessus	Misc.	medium
426105	Alpine: multiple singularity packages: security update to 3.7.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
426105	Alpine: multiple singularity packages: security update to 3.7.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
410932	SCA: security update for github.com/sylabs/singularity (GHSA-5mv9-q7fq-9394)	Tenable Cloud Security	SCA Checks	medium
410932	SCA: security update for github.com/sylabs/singularity (GHSA-5mv9-q7fq-9394)	Tenable Self-Hosted Container Security	SCA Checks	medium
400214	Alpine: singularity: security update to 3.7.3-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
400214	Alpine: singularity: security update to 3.7.3-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
156989	GLSA-202107-50 : Singularity: Remote code execution	Nessus	Gentoo Local Security Checks	medium

Detections

Analytics

CVE-2021-32635

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium