Cilium up to 1.11.14/1.12.7/1.13.0 eBPF-based Dataplane /opt/cni/bin default permission
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A vulnerability was found in Cilium up to 1.11.14/1.12.7/1.13.0. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the file /opt/cni/bin of the component eBPF-based Dataplane. The manipulation with an unknown input leads to a default permission vulnerability. The CWE definition for the vulnerability is CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. As an impact it is known to affect availability. The summary by CVE is:
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, an attacker with access to a Cilium agent pod can write to `/opt/cni/bin` due to a `hostPath` mount of that directory in the agent pod. By replacing the CNI binary with their own malicious binary and waiting for the creation of a new pod on the node, the attacker can gain access to the underlying node. The issue has been fixed and the fix is available on versions 1.11.15, 1.12.8, and 1.13.1. Some workarounds are available. Kubernetes RBAC should be used to deny users and service accounts `exec` access to Cilium agent pods. In cases where a user requires `exec` access to Cilium agent pods, but should not have access to the underlying node, no workaround is possible.
The weakness was released 03/18/2023 as GHSA-4hc4-pgfx-3mrx. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2023-27593 since 03/04/2023. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1222 according to MITRE ATT&CK.
Upgrading to version 1.11.15, 1.12.8 or 1.13.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
CVSSv3VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.3
VulDB Base Score: 2.3
VulDB Temp Score: 2.2
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 4.4
CNA Vector (GitHub, Inc.): 🔒
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
ExploitingClass: Default permission
CWE: CWE-276 / CWE-266
Status: Not defined
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
0-Day Time: 🔒
Upgrade: Cilium 1.11.15/1.12.8/1.13.1
Timeline03/04/2023 CVE reserved
03/18/2023 +14 days Advisory disclosed
03/18/2023 +0 days VulDB entry created
04/11/2023 +24 days VulDB last update
CVE: CVE-2023-27593 (🔒)
EntryCreated: 03/18/2023 08:36 AM
Updated: 04/11/2023 03:03 PM
Changes: 03/18/2023 08:36 AM (52), 04/11/2023 03:03 PM (1)
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