CVE-2021-39206: Github.com/pomerium/pomerium Incorrect Authorization With Specially Crafted Vulnerability
HIGHCVE-2021-39206 is a HIGH (CVSS 8.6) incorrect authorization with specially crafted vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/pomerium/pomerium libraries in the Go ecosystem. The issue involves incorrect authorization with specially crafted requests. Remediation is available by upgrading affected packages to version 0.14.8, 0.15.1.
CVE-2021-39206 at a Glance
Security Impact
CVSS: 8.6
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N).
How to Fix CVE-2021-39206
To remediate this vulnerability, upgrade all affected Github.com/pomerium/pomerium dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/pomerium/pomerium to 0.14.8Upgrade github.com/pomerium/pomerium to 0.15.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/pomerium/pomeriumHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-39206, inspect your project dependencies for Github.com/pomerium/pomerium:
inspect dependencies for github.com/pomerium/pomeriumAnalyze the terminal output to locate any version of Github.com/pomerium/pomerium in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.14.8), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Github.com/pomerium/pomerium, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-39206 Affected Github.com/pomerium/pomerium Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/pomerium/pomerium
|
Go |
≥ 0.11.0
< 0.14.8
|
0.14.8
|
|
github.com/pomerium/pomerium
|
Go |
≥ 0.15.0
< 0.15.1
All 1 versions
0.15.0
|
0.15.1
|
References
Frequently Asked Questions
What is CVE-2021-39206?
Which Github.com/pomerium/pomerium versions are affected?
What version fixes CVE-2021-39206?
Is github.com/pomerium/pomerium affected?
What is the CVSS score of CVE-2021-39206?
What CWE is associated with CVE-2021-39206?
How can I check Go dependencies for CVE-2021-39206?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-cfc2-wjcm-c8fm",
"modified" : "2021-09-10T16:40:43Z",
"published" : "2021-09-10T17:54:25Z",
"aliases" : [ "CVE-2021-39206" ],
"summary" : "Incorrect Authorization with specially crafted requests",
"details" : "Envoy, which Pomerium is based on, contains two authorization related vulnerabilities:\n\n- [CVE-2021-32777](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32779): incorrectly transform a URL containing a `#fragment` element, causing a mismatch in path-prefix based authorization decisions.\n- [CVE-2021-32779](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32777): incorrectly handle duplicate headers, dropping all but the last. This may lead to incorrect routing or authorization policy decisions.\n\n### Impact\nWith specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium.\n\n### Patches\n\nPomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched.\n\n### Workarounds\n\n- This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.\n\n\n### References\n[envoy GSA CVE-2021-32777](https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9)\n[envoy GSA CVE-2021-32779](https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h)\n[envoy announcement](https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [pomerium/pomerium](https://github.com/pomerium/pomerium/issues)\n* Email us at [security@pomerium.com](mailto:security@pomerium.com)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/pomerium/pomerium"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.11.0"
}, {
"fixed" : "0.14.8"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/pomerium/pomerium"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.15.0"
}, {
"fixed" : "0.15.1"
} ]
} ],
"versions" : [ "0.15.0" ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h"
}, {
"type" : "WEB",
"url" : "https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9"
}, {
"type" : "WEB",
"url" : "https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fm"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39206"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/pomerium/pomerium"
}, {
"type" : "WEB",
"url" : "https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-863" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-09-10T16:40:43Z",
"nvd_published_at" : "2021-09-09T23:15:00Z"
}
}