Detections
Analytics
SCA: security update for github.com/docker/docker (GHSA-232p-vwff-86mp)
high Tenable Cloud Security Plugin ID 408618
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 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. Two iptables rules serve to filter
incoming VXLAN datagrams with a VNI that corresponds to an encrypted network and discards unencrypted
datagrams. The rules are appended to the end of the INPUT filter chain, following any rules that have been
previously set by the system administrator. Administrator-set rules take precedence over the rules Moby
sets to discard unencrypted VXLAN datagrams, which can potentially admit unencrypted datagrams that should
have been discarded. The injection of arbitrary Ethernet frames can enable a Denial of Service attack. A
sophisticated attacker may be able to establish a UDP or TCP connection by way of the container’s outbound
gateway that would otherwise be blocked by a stateful firewall, or carry out other escalations beyond
simple injection by smuggling packets into the overlay network. 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. Close the VXLAN port (by default,
UDP port 4789) to incoming traffic at the Internet boundary to prevent all VXLAN packet injection, and/or
ensure that the `xt_u32` kernel module is available on all nodes of the Swarm cluster. (CVE-2023-28840)
See Also
Plugin Details
Severity: High
ID: 408618
Version: Revision 1.5
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: Medium
Score: 4.8
Percentile: 57.62
Vendor
Vendor Severity: High
CVSS v2
Risk Factor: High
Base Score: 7.1
Temporal Score: 5.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:C
CVSS Score Source: CVE-2023-28840
CVSS v3
Risk Factor: High
Base Score: 8.7
Temporal Score: 7.8
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 4/4/2023
Vulnerability Publication Date: 4/4/2023
Reference Information
CVE: CVE-2023-28840