CVE-2021-21411

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Summary

CVECVE-2021-21411
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-26 21:15:00 UTC
Updated2021-04-06 12:42:00 UTC
DescriptionOAuth2-Proxy is an open source reverse proxy that provides authentication with Google, Github or other providers. The `--gitlab-group` flag for group-based authorization in the GitLab provider stopped working in the v7.0.0 release. Regardless of the flag settings, authorization wasn't restricted. Additionally, any authenticated users had whichever groups were set in `--gitlab-group` added to the new `X-Forwarded-Groups` header to the upstream application. While adding GitLab project based authorization support in #630, a bug was introduced where the user session's groups field was populated with the `--gitlab-group` config entries instead of pulling the individual user's group membership from the GitLab Userinfo endpoint. When the session groups where compared against the allowed groups for authorization, they matched improperly (since both lists were populated with the same data) so authorization was allowed. This impacts GitLab Provider users who relies on group membership for authorization restrictions. Any authenticated users in your GitLab environment can access your applications regardless of `--gitlab-group` membership restrictions. This is patched in v7.1.0. There is no workaround for the Group membership bug. But `--gitlab-project` can be set to use Project membership as the authorization checks instead of groups; it is not broken.

Risk And Classification

Problem Types: CWE-863

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Oauth2 Proxy Project Oauth2 Proxy All All All All

References

ReferenceSourceLinkTags
Release V7.1.0 · oauth2-proxy/oauth2-proxy · GitHub MISC github.com
`--gitlab-group` GitLab Group Authorization config flag stopped working in v7.0.0 · Advisory · oauth2-proxy/oauth2-proxy · GitHub CONFIRM github.com
Groups | GitLab MISC docs.gitlab.com
Merge pull request from GHSA-652x-m2gr-hppm · oauth2-proxy/oauth2-proxy@0279fa7 · GitHub MISC github.com
oauth2-proxy · pkg.go.dev MISC pkg.go.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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