CVE-2022-23538: github.com/sylabs/scs-library-client is the Go client for the Singularity Container Services (SCS) Container Library Service. When the scs-library-cli...

Description

github.com/sylabs/scs-library-client is the Go client for the Singularity Container Services (SCS) Container Library Service. When the scs-library-client is used to pull a container image, with authentication, the HTTP Authorization header sent by the client to the library service may be incorrectly leaked to an S3 backing storage provider. This occurs in a specific flow, where the library service redirects the client to a backing S3 storage server, to perform a multi-part concurrent download. Depending on site configuration, the S3 service may be provided by a third party. An attacker with access to the S3 service may be able to extract user credentials, allowing them to impersonate the user. The vulnerable multi-part concurrent download flow, with redirect to S3, is only used when communicating with a Singularity Enterprise 1.x installation, or third party server implementing this flow. Interaction with Singularity Enterprise 2.x, and Singularity Container Services (cloud.sylabs.io), does not trigger the vulnerable flow. We encourage all users to update. Users who interact with a Singularity Enterprise 1.x installation, using a 3rd party S3 storage service, are advised to revoke and recreate their authentication tokens within Singularity Enterprise. There is no workaround available at this time.

Metrics

CVSS 3.1

7.6/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

EPSS Probability

0.71%

48.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sylabs	Singularity Container Services Library	1.3.2
Sylabs	Singularity Container Services Library	1.3.3
Sylabs	Singularity Container Services Library	1.4.0
Sylabs	Singularity Container Services Library	1.4.1

References

https://github.com/sylabs/scs-library-client/commit/68ac4cab5cda0afd8758ff5b5e2e57be6a22fcfaPatch, Third Party Advisory
https://github.com/sylabs/scs-library-client/commit/b5db2aacba6bf1231f42dd475cc32e6355ab47b2Patch, Third Party Advisory
https://github.com/sylabs/scs-library-client/commit/eebd7caaab310b1fa803e55b8fc1acd9dcd2d00cPatch, Third Party Advisory
https://github.com/sylabs/scs-library-client/security/advisories/GHSA-7p8m-22h4-9pj7Third Party Advisory
https://github.com/sylabs/scs-library-client/commit/68ac4cab5cda0afd8758ff5b5e2e57be6a22fcfaPatch, Third Party Advisory
https://github.com/sylabs/scs-library-client/commit/b5db2aacba6bf1231f42dd475cc32e6355ab47b2Patch, Third Party Advisory
https://github.com/sylabs/scs-library-client/commit/eebd7caaab310b1fa803e55b8fc1acd9dcd2d00cPatch, Third Party Advisory
https://github.com/sylabs/scs-library-client/security/advisories/GHSA-7p8m-22h4-9pj7Third Party Advisory

Timeline

Published: Jan 17, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-23538?

github.com/sylabs/scs-library-client is the Go client for the Singularity Container Services (SCS) Container Library Service. When the scs-library-client is used to pull a container image, with authentication, the HTTP Authorization header sent by the client to the library service may be incorrectly leaked to an S3 backing storage provider. This occurs in a specific flow, where the library service redirects the client to a backing S3 storage server, to perform a multi-part concurrent download. Depending on site configuration, the S3 service may be provided by a third party. An attacker with access to the S3 service may be able to extract user credentials, allowing them to impersonate the user. The vulnerable multi-part concurrent download flow, with redirect to S3, is only used when communicating with a Singularity Enterprise 1.x installation, or third party server implementing this flow. Interaction with Singularity Enterprise 2.x, and Singularity Container Services (cloud.sylabs.io), does not trigger the vulnerable flow. We encourage all users to update. Users who interact with a Singularity Enterprise 1.x installation, using a 3rd party S3 storage service, are advised to revoke and recreate their authentication tokens within Singularity Enterprise. There is no workaround available at this time.

How severe is CVE-2022-23538?

CVE-2022-23538 has a CVSS score of 7.6/10 (HIGH severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2022-23538?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.