CVE-2021-32635

Aliases:GHSA-5mv9-q7fq-9394
Advisory lineage Upstream: 0 Downstream: 3
Modified
Published: 28 May 2021, 20:20
Last modified:03 Aug 2024, 23:25

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.8 MEDIUM
v2.0 (nvd)
EPSS Score
0.63% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 May 2021, 20:20
Published
Vulnerability first disclosed
03 Aug 2024, 23:25
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•MEDIUM•Score: 6.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  • v2.0•MEDIUM•Score: 6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.63%• Percentile: 71%

Techniques & Countermeasures

  • CWE-923•Improper Restriction of Communication Channel to Intended Endpoints

    The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected Systems

  • github.com/sylabs•singularity

    ≥ 3.7.2, < 3.7.4

  • sylabs•singularity

    3.7.2 | 3.7.3 | ≥ 3.7.2, ≤ 3.7.3

References (7)