CVE-2023-27593
Cilium eBPF-based Dataplane CNI Binary Rewrite File System Access Vulnerability
Description
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.
INFO
Published Date :
March 17, 2023, 8:15 p.m.
Last Modified :
Nov. 7, 2023, 4:10 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-27593.
| URL | Resource |
|---|---|
| https://github.com/cilium/cilium/pull/24075 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.11.15 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.12.8 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.13.1 | Third Party Advisory |
| https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx | Third Party Advisory |
| https://kubernetes.io/docs/reference/access-authn-authz/rbac/ | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-27593 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-27593 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed Description 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. 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. -
Initial Analysis by [email protected]
Mar. 24, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://github.com/cilium/cilium/pull/24075 No Types Assigned https://github.com/cilium/cilium/pull/24075 Third Party Advisory Changed Reference Type https://github.com/cilium/cilium/releases/tag/v1.11.15 No Types Assigned https://github.com/cilium/cilium/releases/tag/v1.11.15 Third Party Advisory Changed Reference Type https://github.com/cilium/cilium/releases/tag/v1.12.8 No Types Assigned https://github.com/cilium/cilium/releases/tag/v1.12.8 Third Party Advisory Changed Reference Type https://github.com/cilium/cilium/releases/tag/v1.13.1 No Types Assigned https://github.com/cilium/cilium/releases/tag/v1.13.1 Third Party Advisory Changed Reference Type https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx No Types Assigned https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx Third Party Advisory Changed Reference Type https://kubernetes.io/docs/reference/access-authn-authz/rbac/ No Types Assigned https://kubernetes.io/docs/reference/access-authn-authz/rbac/ Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* versions up to (excluding) 1.11.15 *cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* versions from (including) 1.12.0 up to (excluding) 1.12.8 *cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* versions from (including) 1.13.0 up to (excluding) 1.13.1
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-27593 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-27593
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.14240
percentile