CVE-2023-27595: Github.com/cilium/cilium Cilium EBPF Filters May Be Vulnerability
MODERATECVE-2023-27595 is a MODERATE (CVSS 6.5) cilium ebpf filters may be vulnerability (CWE-755: Improper Handling of Exceptional Conditions) affecting Github.com/cilium/cilium libraries in the Go ecosystem. The issue involves cilium ebpf filters may be temporarily removed during agent restart. Remediation is available by upgrading affected packages to version 1.13.1.
CVE-2023-27595 at a Glance
Security Impact
CVSS: 6.5
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:C/C:L/I:L/A:L).
How to Fix CVE-2023-27595
To remediate this vulnerability, upgrade all affected Github.com/cilium/cilium 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/cilium/cilium to 1.13.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/cilium/ciliumHow to Check if You Are Affected
To determine whether your application is affected by CVE-2023-27595, inspect your project dependencies for Github.com/cilium/cilium:
inspect dependencies for github.com/cilium/ciliumAnalyze the terminal output to locate any version of Github.com/cilium/cilium in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.13.1), 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-755: Improper Handling of Exceptional Conditions, where the product does not handle or incorrectly handles an exceptional condition. In Github.com/cilium/cilium, 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-2023-27595 Affected Github.com/cilium/cilium Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/cilium/cilium
|
Go |
≥ 1.13.0
< 1.13.1
|
1.13.1
|
References
Frequently Asked Questions
What is CVE-2023-27595?
Which Github.com/cilium/cilium versions are affected?
What version fixes CVE-2023-27595?
Is github.com/cilium/cilium affected?
What is the CVSS score of CVE-2023-27595?
What CWE is associated with CVE-2023-27595?
How can I check Go dependencies for CVE-2023-27595?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-r5x6-w42p-jhpp",
"modified" : "2023-03-20T13:59:25Z",
"published" : "2023-03-17T18:22:57Z",
"aliases" : [ "CVE-2023-27595" ],
"summary" : "Cilium eBPF filters may be temporarily removed during agent restart",
"details" : "### Impact\n\nWhen Cilium is started, there is a short period when Cilium eBPF programs are not attached to the host. During this period, the host does not implement any of Cilium's featureset. This can cause disruption to newly established connections during this period due to the lack of Load Balancing, or can cause Network Policy bypass due to the lack of Network Policy enforcement during the window. This vulnerability impacts any Cilium-managed endpoints on the node (such as Kubernetes Pods), as well as the host network namespace (including Host Firewall).\n\n### Patches\n\nThis vulnerability is fixed by https://github.com/cilium/cilium/pull/24336, included in Cilium 1.13.1 or later. Cilium releases 1.12.x, 1.11.x and earlier are not affected.\n\n### Workarounds\n\nThere are no known workarounds.\n\n### Acknowledgements\n\nThe Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to Louis DeLosSantos and Timo Beckers for investigating and fixing the issue.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).\n\nAs usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: security@cilium.io - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/cilium/cilium"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.13.0"
}, {
"fixed" : "1.13.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/cilium/cilium/security/advisories/GHSA-r5x6-w42p-jhpp"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-27595"
}, {
"type" : "WEB",
"url" : "https://github.com/cilium/cilium/pull/24336"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/cilium/cilium"
}, {
"type" : "WEB",
"url" : "https://github.com/cilium/cilium/releases/tag/v1.13.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-755" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2023-03-17T18:22:57Z",
"nvd_published_at" : "2023-03-17T22:15:00Z"
}
}