CVE-2024-47825CWE-276

CIDR deny policies may not take effect when a more narrow CIDR allow is present

Medium · published October 21, 2024

CVSS v3.1
4.0
EPSS
0%
Percentile
32.7
In the wild
Unconfirmed
What it is

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Starting in version 1.14.0 and prior to versions 1.14.16 and 1.15.10, a policy rule denying a prefix that is broader than `/32` may be ignored if there is a policy rule referencing a more narrow prefix (`CIDRSet` or `toFQDN`) and this narrower policy rule specifies either `enableDefaultDeny: false` or `- toEntities: all`. Note that a rule specifying `toEntities: world` or `toEntities: 0.0.0.0/0` is insufficient, it must be to entity `all`.This issue has been patched in Cilium v1.14.16 and v1.15.10. As this issue only affects policies using `enableDefaultDeny: false` or that set `toEntities` to `all`, some workarounds are available. For users with policies using `enableDefaultDeny: false`, remove this configuration option and explicitly define any allow rules required. For users with egress policies that explicitly specify `toEntities: all`, use `toEntities: world`.

The record
Technical detail
CVSS v3.1
4.0 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00397 · 32.7th percentile
Weakness
CWE-276 · Incorrect Default Permissions
Published
2024-10-21T19:05Z
EPSS history
Timeline
  • 21 OCT 19:05Z
    CIDR deny policies may not take effect when a more narrow CIDR allow is present
    cvelistv5