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SCA: security update for github.com/docker/docker (GHSA-6wrf-mxfj-pf5p)
medium Tenable Self-Hosted Container Security Plugin ID 411679
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- Moby) is an open source container framework developed by Docker Inc. that is distributed as Docker,
Mirantis Container Runtime, and various other downstream projects/products. The Moby daemon component
(`dockerd`), which is developed as moby/moby is commonly referred to as *Docker*. Swarm Mode, which is
compiled in and delivered by default in `dockerd` and is thus present in most major Moby downstreams, is a
simple, built-in container orchestrator that is implemented through a combination of SwarmKit and
supporting network code. The `overlay` network driver is a core feature of Swarm Mode, providing isolated
virtual LANs that allow communication between containers and services across the cluster. This driver is
an implementation/user of VXLAN, which encapsulates link-layer (Ethernet) frames in UDP datagrams that tag
the frame with the VXLAN metadata, including a VXLAN Network ID (VNI) that identifies the originating
overlay network. In addition, the overlay network driver supports an optional, off-by-default encrypted
mode, which is especially useful when VXLAN packets traverses an untrusted network between nodes.
Encrypted overlay networks function by encapsulating the VXLAN datagrams through the use of the IPsec
Encapsulating Security Payload protocol in Transport mode. By deploying IPSec encapsulation, encrypted
overlay networks gain the additional properties of source authentication through cryptographic proof, data
integrity through check-summing, and confidentiality through encryption. When setting an endpoint up on an
encrypted overlay network, Moby installs three iptables (Linux kernel firewall) rules that enforce both
incoming and outgoing IPSec. These rules rely on the `u32` iptables extension provided by the `xt_u32`
kernel module to directly filter on a VXLAN packet's VNI field, so that IPSec guarantees can be enforced
on encrypted overlay networks without interfering with other overlay networks or other users of VXLAN. The
`overlay` driver dynamically and lazily defines the kernel configuration for the VXLAN network on each
node as containers are attached and detached. Routes and encryption parameters are only defined for
destination nodes that participate in the network. The iptables rules that prevent encrypted overlay
networks from accepting unencrypted packets are not created until a peer is available with which to
communicate. Encrypted overlay networks silently accept cleartext VXLAN datagrams that are tagged with the
VNI of an encrypted overlay network. As a result, it is possible to inject arbitrary Ethernet frames into
the encrypted overlay network by encapsulating them in VXLAN datagrams. The implications of this can be
quite dire, and GHSA-vwm3-crmr-xfxw should be referenced for a deeper exploration. Patches are available
in Moby releases 23.0.3, and 20.10.24. As Mirantis Container Runtime's 20.10 releases are numbered
differently, users of that platform should update to 20.10.16. Some workarounds are available. In multi-
node clusters, deploy a global ‘pause’ container for each encrypted overlay network, on every node. For a
single-node cluster, do not use overlay networks of any sort. Bridge networks provide the same
connectivity on a single node and have no multi-node features. The Swarm ingress feature is implemented
using an overlay network, but can be disabled by publishing ports in `host` mode instead of `ingress` mode
(allowing the use of an external load balancer), and removing the `ingress` network. If encrypted overlay
networks are in exclusive use, block UDP port 4789 from traffic that has not been validated by IPSec.
(CVE-2023-28842)
See Also
Plugin Details
Severity: Medium
ID: 411679
Version: Revision 1.6
Type: Local
Family: SCA Checks
Published: 1/23/2025
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Low
Score: 3.3
Percentile: 51.16
Vendor
Vendor Severity: Medium
CVSS v2
Risk Factor: Medium
Base Score: 5.4
Temporal Score: 4
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N
CVSS Score Source: CVE-2023-28842
CVSS v3
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 4/4/2023
Vulnerability Publication Date: 4/4/2023
Reference Information
CVE: CVE-2023-28842