In the Harbor jobservice container, the comparison of secrets in the authenticator type is prone to timing attacks. The vulnerability occurs due to the following code:

subtle.ConstantTimeCompare([]byte(expectedSecret), []byte(secret)) == 0

Impact

This attack might be possible theoretically, but no workable proof of concept is available, and access complexity is set at High.
The jobservice exposes these APIs

Create a job task --- POST /api/v1/jobs    
Get job task information --- GET /api/v1/jobs/{job_id}
Stop job task ---  POST /api/v1/jobs/{job_id}
Get job log task ---  GET /api/v1/jobs/{job_id}/log
Get job execution --- GET /api/v1/jobs/{job_id}/executions
Get job stats ---  GET /api/v1/stats
Get job service configuration ---  GET /api/v1/config

It is used to create jobs/stop job tasks and retrieve job task information. If an attacker obtains the secrets, it is possible to retrieve the job information, create a job, or stop a job task.

The following versions of Harbor are involved:
<=Harbor 2.8.2, <=Harbor 2.7.2, <= Harbor 2.6.x, <=Harbor 1.10.17

Patches

Harbor 2.8.3, Harbor 2.7.3, Harbor 1.10.18

Workarounds

Because the jobservice only exposes HTTP service to harbor-core containers, blocking any inbound traffic from the external network to the jobservice container can reduce the risk.

Credits

Thanks to Porcupiney Hairs for reporting this issue.