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Security Advisories: GSA_kwCzR0hTQS1ycnFyLTd3NTktNjM3ds4AA9mz

Pomerium exposed OAuth2 access and ID tokens in user info endpoint response

Impact

The Pomerium user info page (at /.pomerium) unintentionally included serialized OAuth2 access and ID tokens from the logged-in user's session. These tokens are not intended to be exposed to end users.

This issue may be more severe in the presence of an XSS vulnerability in an upstream application proxied through Pomerium. If an attacker could insert a malicious script onto a web page proxied through Pomerium, that script could access these tokens by making a request to the /.pomerium endpoint.

Upstream applications that authenticate only the ID token may be vulnerable to user impersonation using a token obtained in this manner.

Note that an OAuth2 access token or ID token by itself is not sufficient to hijack a user's Pomerium session. Upstream applications should not be vulnerable to user impersonation via these tokens provided:

Patches

Patched in Pomerium v0.26.1.

Workarounds

None

For more information

If you have any questions or comments about this advisory:

Credit to Vadim Sheydaev, aka Enr1g for reporting this issue.

Permalink: https://github.com/advisories/GHSA-rrqr-7w59-637v
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ycnFyLTd3NTktNjM3ds4AA9mz
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 9 days ago
Updated: 9 days ago


CVSS Score: 5.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Identifiers: GHSA-rrqr-7w59-637v, CVE-2024-39315
References: Repository: https://github.com/pomerium/pomerium
Blast Radius: 4.0

Affected Packages

go:github.com/pomerium/pomerium
Dependent packages: 5
Dependent repositories: 5
Downloads:
Affected Version Ranges: < 0.26.1
Fixed in: 0.26.1
All affected versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.1.0, 0.2.0, 0.2.1, 0.3.0, 0.3.1, 0.4.0, 0.4.1, 0.4.2, 0.5.0, 0.5.1, 0.5.2, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5, 0.7.6, 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.9.0, 0.9.1, 0.9.2, 0.9.4, 0.9.5, 0.9.6, 0.10.0, 0.10.1, 0.10.2, 0.10.3, 0.10.4, 0.10.5, 0.10.6, 0.11.0, 0.11.1, 0.12.0, 0.12.1, 0.12.2, 0.13.0, 0.13.1, 0.13.2, 0.13.3, 0.13.4, 0.13.5, 0.13.6, 0.14.0, 0.14.1, 0.14.2, 0.14.3, 0.14.4, 0.14.5, 0.14.6, 0.14.7, 0.14.8, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.15.5, 0.15.6, 0.15.7, 0.15.8, 0.16.0, 0.16.1, 0.16.2, 0.16.3, 0.16.4, 0.17.0, 0.17.1, 0.17.2, 0.17.3, 0.17.4, 0.18.0, 0.18.1, 0.19.0, 0.19.1, 0.19.2, 0.20.0, 0.20.1, 0.21.0, 0.21.1, 0.21.2, 0.21.3, 0.21.4, 0.22.0, 0.22.1, 0.22.2, 0.22.3, 0.23.0, 0.24.0, 0.25.0
All unaffected versions: