CVE-2019-1002101: K8s.io/kubernetes Symlink Attack Vulnerability
MODERATECVE-2019-1002101 is a MODERATE (CVSS 5.5) symlink attack vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting K8s.io/kubernetes libraries in the Go ecosystem. The issue involves symlink attack in kubectl cp. Remediation is available by upgrading affected packages to version 1.11.9, 1.12.7, 1.13.5.
CVE-2019-1002101 at a Glance
Security Impact
CVSS: 5.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N).
How to Fix CVE-2019-1002101
To remediate this vulnerability, upgrade all affected K8s.io/kubernetes 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 k8s.io/kubernetes to 1.11.9Upgrade k8s.io/kubernetes to 1.12.7Upgrade k8s.io/kubernetes to 1.13.5Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for k8s.io/kubernetesHow to Check if You Are Affected
To determine whether your application is affected by CVE-2019-1002101, inspect your project dependencies for K8s.io/kubernetes:
inspect dependencies for k8s.io/kubernetesAnalyze the terminal output to locate any version of K8s.io/kubernetes in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.9), 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-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In K8s.io/kubernetes, 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-2019-1002101 Affected K8s.io/kubernetes Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
k8s.io/kubernetes
|
Go |
< 1.11.9
|
1.11.9
|
|
k8s.io/kubernetes
|
Go |
≥ 1.12.0
< 1.12.7
|
1.12.7
|
|
k8s.io/kubernetes
|
Go |
≥ 1.13.0
< 1.13.5
|
1.13.5
|
References
Frequently Asked Questions
What is CVE-2019-1002101?
Which K8s.io/kubernetes versions are affected?
What version fixes CVE-2019-1002101?
Is k8s.io/kubernetes affected?
What is the CVSS score of CVE-2019-1002101?
What CWE is associated with CVE-2019-1002101?
How can I check Go dependencies for CVE-2019-1002101?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-34jx-wx69-9x8v",
"modified" : "2023-09-18T19:40:25Z",
"published" : "2022-02-15T01:57:18Z",
"aliases" : [ "CVE-2019-1002101" ],
"summary" : "Symlink Attack in kubectl cp",
"details" : "The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.11.9"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.12.0"
}, {
"fixed" : "1.12.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.13.0"
}, {
"fixed" : "1.13.5"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-1002101"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/75037"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/commit/47063891dd782835170f500a83f37cc98c3c1013"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHBA-2019:0619"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHBA-2019:0620"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHBA-2019:0636"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPV2RE5RMOGUVP5WJMXKQJZUBBLAFZPZ"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QZB7E3DOZ5WDG46XAIU6K32CXHXPXB2F"
}, {
"type" : "WEB",
"url" : "https://www.twistlock.com/labs-blog/disclosing-directory-traversal-vulnerability-kubernetes-copy-cve-2019-1002101"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2019/06/21/1"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2019/08/05/5"
}, {
"type" : "WEB",
"url" : "http://www.securityfocus.com/bid/107652"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-59" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2021-05-19T21:58:27Z",
"nvd_published_at" : null
}
}