CVE-2021-32635

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.

CVSS v3.0 6.3 MEDIUM
CVSS v2.0 6.8 MEDIUM

6.3^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

6.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394	Third Party Advisory
https://github.com/sylabs/singularity/releases/tag/v3.7.4	Third Party Advisory
https://security.gentoo.org/glsa/202107-50	Third Party Advisory

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:sylabs:singularity:3.7.2:::::::*
	cpe:2.3:a:sylabs:singularity:3.7.3:::::::*

Information

Published : 2021-05-28 14:15

Updated : 2022-04-22 09:19

NVD link : CVE-2021-32635

Mitre link : CVE-2021-32635

JSON object : View

CWE

NVD-CWE-Other CWE-20

Improper Input Validation

CWE-923

Improper Restriction of Communication Channel to Intended Endpoints

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Products Affected

sylabs

singularity

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