CVE-2021-25318: Github.com/rancher/rancher Remote Code Execution Vulnerability
HIGHCVE-2021-25318 is a HIGH (CVSS 8.8) remote code execution vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting Github.com/rancher/rancher libraries in the Go ecosystem. The issue involves rancher does not properly specify apigroup when creating kubernetes rbac resources. Remediation is available by upgrading affected packages to version 2.4.16, 2.5.9.
CVE-2021-25318 at a Glance
Security Impact
CVSS: 8.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2021-25318
To remediate this vulnerability, upgrade all affected Github.com/rancher/rancher 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/rancher/rancher to 2.4.16Upgrade github.com/rancher/rancher to 2.5.9Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/rancher/rancherHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-25318, inspect your project dependencies for Github.com/rancher/rancher:
inspect dependencies for github.com/rancher/rancherAnalyze the terminal output to locate any version of Github.com/rancher/rancher in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.4.16), 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-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. In Github.com/rancher/rancher, 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-2021-25318 Affected Github.com/rancher/rancher Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/rancher/rancher
|
Go |
≥ 2.0.0
< 2.4.16
|
2.4.16
|
|
github.com/rancher/rancher
|
Go |
≥ 2.5.0
< 2.5.9
|
2.5.9
|
References
Frequently Asked Questions
What is CVE-2021-25318?
Which Github.com/rancher/rancher versions are affected?
What version fixes CVE-2021-25318?
Is github.com/rancher/rancher affected?
What is the CVSS score of CVE-2021-25318?
What CWE is associated with CVE-2021-25318?
How can I check Go dependencies for CVE-2021-25318?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-f9xf-jq4j-vqw4",
"modified" : "2024-07-08T20:41:27Z",
"published" : "2024-04-24T21:02:01Z",
"aliases" : [ "CVE-2021-25318" ],
"summary" : "Rancher does not properly specify ApiGroup when creating Kubernetes RBAC resources",
"details" : "A vulnerability was discovered in Rancher versions 2.0 through the aforementioned fixed versions, where users were granted access to resources regardless of the resource's API group. For example Rancher should have allowed users access to `apps.catalog.cattle.io`, but instead incorrectly gave access to `apps.*`. Resource affected include: \n\n**Downstream clusters:**\napiservices\nclusters\nclusterrepos\npersistentvolumes\nstorageclasses\n\n**Rancher management cluster**\napprevisions\napps\ncatalogtemplates\ncatalogtemplateversions\nclusteralertgroups\nclusteralertrules\nclustercatalogs\nclusterloggings\nclustermonitorgraphs\nclusterregistrationtokens\nclusterroletemplatebindings\nclusterscans\netcdbackups\nnodepools\nnodes\nnotifiers\npipelineexecutions\npipelines\npipelinesettings\npodsecuritypolicytemplateprojectbindings\nprojectalertgroups\nprojectalertrules\nprojectcatalogs\nprojectloggings\nprojectmonitorgraphs\nprojectroletemplatebindings\nprojects\nsecrets\nsourcecodeproviderconfigs\n\nThere is not a direct mitigation besides upgrading to the patched Rancher versions.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/rancher/rancher"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0"
}, {
"fixed" : "2.4.16"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/rancher/rancher"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.5.0"
}, {
"fixed" : "2.5.9"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-25318"
}, {
"type" : "WEB",
"url" : "https://github.com/rancher/rancher/issues/33590"
}, {
"type" : "WEB",
"url" : "https://bugzilla.suse.com/show_bug.cgi?id=1184913"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/rancher/rancher"
}, {
"type" : "WEB",
"url" : "https://pkg.go.dev/vuln/GO-2024-2768"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-732" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2024-04-24T21:02:01Z",
"nvd_published_at" : "2021-07-15T09:15:00Z"
}
}