Severity

Critical

Vendor

VMware Tanzu

Description

Concourse for VMware Tanzu, versions prior to 6.3.1, in installations which use the GitLab auth connector, is vulnerable to identity spoofing by way of configuring a GitLab account with the same full name as another user who is granted access to a Concourse team.

GitLab groups do not have this vulnerability, so GitLab users may be moved into groups which are then configured in the Concourse team.

Affected VMware Products and Versions

Severity is critical unless otherwise noted.

• Concourse for VMware Tanzu
  • 6.3 versions prior to 6.3.1

Mitigation

• Concourse for VMware Tanzu
  • 6.3.1

Credit

Gregoire Detrez

References

• https://github.com/concourse/concourse/security/advisories/GHSA-627p-rr78-99rj

History

2020-08-11: Initial vulnerability report published.