CVE-2022-23632: Github.com/traefik/traefik/v2 Skip The Router TLS Configuration Vulnerability
HIGHCVE-2022-23632 is a HIGH (CVSS 7.4) skip the router tls configuration vulnerability (CWE-295: Improper Certificate Validation) affecting Github.com/traefik/traefik/v2 libraries in the Go ecosystem. The issue involves skip the router tls configuration when the host header is an fqdn. Remediation is available by upgrading affected packages to version 2.6.1.
CVE-2022-23632 at a Glance
Security Impact
CVSS: 7.4
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2022-23632
To remediate this vulnerability, upgrade all affected Github.com/traefik/traefik/v2 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/traefik/traefik/v2 to 2.6.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/traefik/traefik/v2How to Check if You Are Affected
To determine whether your application is affected by CVE-2022-23632, inspect your project dependencies for Github.com/traefik/traefik/v2:
inspect dependencies for github.com/traefik/traefik/v2Analyze the terminal output to locate any version of Github.com/traefik/traefik/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.6.1), 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Github.com/traefik/traefik/v2, 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-2022-23632 Affected Github.com/traefik/traefik/v2 Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/traefik/traefik/v2
|
Go |
< 2.6.1
|
2.6.1
|
References
Frequently Asked Questions
What is CVE-2022-23632?
Which Github.com/traefik/traefik/v2 versions are affected?
What version fixes CVE-2022-23632?
Is github.com/traefik/traefik/v2 affected?
What is the CVSS score of CVE-2022-23632?
What CWE is associated with CVE-2022-23632?
How can I check Go dependencies for CVE-2022-23632?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-hrhx-6h34-j5hc",
"modified" : "2022-02-16T22:30:57Z",
"published" : "2022-02-16T22:30:57Z",
"aliases" : [ "CVE-2022-23632" ],
"summary" : "Skip the router TLS configuration when the host header is an FQDN",
"details" : "### Impact\n\nPeople that configure mTLS between Traefik and clients.\n\nFor a request, the TLS configuration choice can be different than the router choice, which implies the use of a wrong TLS configuration.\n\n- When sending a request using FQDN handled by a router configured with a dedicated TLS configuration, the TLS configuration falls back to the default configuration that might not correspond to the configured one.\n\n- If the CNAME flattening is enabled, the selected TLS configuration is the SNI one and the routing uses the CNAME value, so this can skip the expected TLS configuration.\n\n### Patches\n\nTraefik v2.6.x: https://github.com/traefik/traefik/releases/tag/v2.6.1\n\n### Workarounds\n\nAdd the FDQN to the host rule:\n\nExample:\n\n```yml\n whoami:\n image: traefik/whoami:v1.7.1\n labels:\n traefik.http.routers.whoami.rule: Host(`whoami.example.com`, `whoami.example.com.`)\n traefik.http.routers.whoami.tls: true\n traefik.http.routers.whoami.tls.options: mtls@file\n```\n\nThere is no workaround if the CNAME flattening is enabled.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/traefik/traefik/v2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.6.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/traefik/traefik/security/advisories/GHSA-hrhx-6h34-j5hc"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-23632"
}, {
"type" : "WEB",
"url" : "https://github.com/traefik/traefik/pull/8764"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/traefik/traefik"
}, {
"type" : "WEB",
"url" : "https://github.com/traefik/traefik/releases/tag/v2.6.1"
}, {
"type" : "WEB",
"url" : "https://www.oracle.com/security-alerts/cpujul2022.html"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-295" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2022-02-16T22:30:57Z",
"nvd_published_at" : "2022-02-17T15:15:00Z"
}
}