Bugzilla – Bug 1214108
VUL-0: CVE-2023-28841: docker,golang-github-docker-libnetwork: Encrypted overlay network traffic may be unencrypted
Last modified: 2024-05-23 08:34:48 UTC
CVE-2023-28841 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. An iptables rule designates outgoing VXLAN datagrams with a VNI that corresponds to an encrypted overlay network for IPsec encapsulation. On Red Hat Enterprise Linux and derivatives such as CentOS and Rocky, the xt_u32 module has been: - moved to the kernel-modules-extra package and no longer installed by default in RHEL 8.3 - officially deprecated in RHEL 8.6 - removed completely in RHEL 9 This rule is not created when xt_u32 is unavailable, even though the container is still attached to the network. Impact 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 rely on Swarm encrypted overlay networks to provide confidentiality, which due to this vulnerability is no longer guaranteed. Patches 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. Workarounds - Close the VXLAN port (by default, UDP port 4789) to incoming traffic at the Internet boundary (see GHSA-vwm3-crmr-xfxw) to prevent all VXLAN packet injection. - Ensure that the xt_u32 kernel module is available on all nodes of the Swarm cluster. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-28841 https://bugzilla.redhat.com/show_bug.cgi?id=2184685 https://www.cve.org/CVERecord?id=CVE-2023-28841 https://github.com/moby/libnetwork/blob/d9fae4c73daf76c3b0f77e14b45b8bf612ba764d/drivers/overlay/encryption.go#L205-L207 https://github.com/moby/libnetwork/security/advisories/GHSA-gvm4-2qqg-m333 https://github.com/moby/moby/issues/43382 https://github.com/moby/moby/pull/45118 https://github.com/moby/moby/security/advisories/GHSA-232p-vwff-86mp https://github.com/moby/moby/security/advisories/GHSA-33pg-m6jh-5237 https://github.com/moby/moby/security/advisories/GHSA-6wrf-mxfj-pf5p https://github.com/moby/moby/security/advisories/GHSA-vwm3-crmr-xfxw
Tracking as affected: - SUSE:SLE-12:Update/docker - SUSE:SLE-12:Update/golang-github-docker-libnetwork - SUSE:SLE-15:Update/golang-github-docker-libnetwork Upstream security advisory: https://github.com/moby/moby/security/advisories/GHSA-33pg-m6jh-5237 Upstream patch: https://github.com/moby/libnetwork/commit/0d7f33e190f5c52414e18d7d76310554b704ba9c (same fix as bug 1214107 and 1214109)
SUSE-SU-2023:3307-1: An update that solves three vulnerabilities can now be installed. Category: security (important) Bug References: 1214107, 1214108, 1214109 CVE References: CVE-2023-28840, CVE-2023-28841, CVE-2023-28842 Sources used: Containers Module 12 (src): docker-20.10.25_ce-98.93.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2023:3536-1: An update that solves three vulnerabilities and has five security fixes can now be installed. Category: security (moderate) Bug References: 1210797, 1212368, 1213120, 1213229, 1213500, 1214107, 1214108, 1214109 CVE References: CVE-2023-28840, CVE-2023-28841, CVE-2023-28842 Sources used: openSUSE Leap 15.4 (src): docker-24.0.5_ce-150000.185.1 openSUSE Leap 15.5 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro for Rancher 5.3 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro 5.3 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro for Rancher 5.4 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro 5.4 (src): docker-24.0.5_ce-150000.185.1 Containers Module 15-SP4 (src): docker-24.0.5_ce-150000.185.1 Containers Module 15-SP5 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS 15-SP1 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise High Performance Computing ESPOS 15 SP3 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise High Performance Computing LTSS 15 SP3 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server 15 SP1 LTSS 15-SP1 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server 15 SP3 LTSS 15-SP3 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server for SAP Applications 15 SP1 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Server for SAP Applications 15 SP3 (src): docker-24.0.5_ce-150000.185.1 SUSE Enterprise Storage 7.1 (src): docker-24.0.5_ce-150000.185.1 SUSE CaaS Platform 4.0 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro 5.1 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro 5.2 (src): docker-24.0.5_ce-150000.185.1 SUSE Linux Enterprise Micro for Rancher 5.2 (src): docker-24.0.5_ce-150000.185.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
done, closing