Auth bypass in Pomerium
CVE-2021-41230
Pomerium is an open source identity-aware access proxy. In affected versions changes to the OIDC claims of a user after initial login are not reflected in policy evaluation when using `allowed_idp_claims` as part of policy. If using `allowed_idp_claims` and a user's claims are changed, Pomerium can make incorrect authorization decisions. This issue has been resolved in v0.15.6. For users unable to upgrade clear data on `databroker` service by clearing redis or restarting the in-memory databroker to force claims to be updated.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (56.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Pomerium — versions >= 0.14.0, < 0.15.6
Weakness classification (CWE)
References
- github.com/pomerium/pomerium/security/advisories/GHSA-j6wp-3859-vxfg (Third Party Advisory)
- github.com/pomerium/pomerium/pull/2724 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41230?
- CVE-2021-41230 is a medium-severity vulnerability in Pomerium, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2021-11-05.
- How severe is CVE-2021-41230?
- Medium severity. CVSS v3 base score is 5.3 out of 10.