In short
- CVE-2021-39206 is a HIGH (CVSS 8.6) vulnerability affecting github.com/pomerium/pomerium, envoy (envoyproxy), pomerium (pomerium).
- Chance of exploitation in the next 30 days (EPSS): 1.5%, higher than 73.5% of all vulnerabilities.
- Fix: update to 0.14.8, 0.15.1, 1.17.4, 1.18.4 or later.
| Package | Affected versions | Patched versions |
|---|
| github.com/pomerium/pomerium Go | ≥ 0.11.0, < 0.14.8≥ 0.15.0, < 0.15.1
| 0.14.80.15.1
|
| envoy | = 1.19.0≥ 1.17.0, < 1.17.4≥ 1.18.0, < 1.18.4< 1.16.5
| 1.17.41.18.41.16.5
|
| pomerium | = 0.15.0≥ 0.11.0, < 0.14.8
| 0.14.8
|
Description
Envoy, which Pomerium is based on, contains two authorization related vulnerabilities:
- CVE-2021-32777: incorrectly transform a URL containing a
#fragment element, causing a mismatch in path-prefix based authorization decisions.
- CVE-2021-32779: incorrectly handle duplicate headers, dropping all but the last. This may lead to incorrect routing or authorization policy decisions.
Impact
With specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium.
Patches
Pomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched.
Workarounds
- This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.
References
envoy GSA CVE-2021-32777
envoy GSA CVE-2021-32779
envoy announcement
For more information
If you have any questions or comments about this advisory:
NVD description
Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization related vulnerabilities CVE-2021-32777 and CVE-2021-32779. This may lead to incorrect routing or authorization policy decisions. With specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium. Pomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched. This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.
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