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SCA: security update for github.com/docker/docker (GHSA-33pg-m6jh-5237)

medium Tenable Self-Hosted Container Security Plugin ID 409252

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. An
 iptables rule designates outgoing VXLAN datagrams with a VNI that corresponds to an encrypted overlay
 network for IPsec encapsulation. Encrypted overlay networks on affected platforms silently transmit
 unencrypted data. As a result, `overlay` networks may appear to be functional, passing traffic as
 expected, but without any of the expected confidentiality or data integrity guarantees. It is possible for
 an attacker sitting in a trusted position on the network to read all of the application traffic that is
 moving across the overlay network, resulting in unexpected secrets or user data disclosure. Thus, because
 many database protocols, internal APIs, etc. are not protected by a second layer of encryption, a user may
 use Swarm encrypted overlay networks to provide confidentiality, which due to this vulnerability this is
 no longer guaranteed. 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 outgoing traffic at the
 Internet boundary in order to prevent unintentionally leaking unencrypted traffic over the Internet,
 and/or ensure that the `xt_u32` kernel module is available on all nodes of the Swarm cluster.
 (CVE-2023-28841)

See Also

https://github.com/advisories/GHSA-33pg-m6jh-5237

Plugin Details

Severity: Medium

ID: 409252

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: 51.27

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.2

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2023-28841

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 6.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

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-2023-28841