CVE-2023-28842— Moby 安全漏洞
一分钟漏洞结论
影响对象
moby moby
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Moby是一个开源项目，旨在推动软件的容器化，并帮助生态系统使容器技术主流化。 Moby 1.12版本及之后版本存在安全漏洞。攻击者利用该漏洞通过将任意以太网帧封装在VXLAN数据报中，将它们注入加密覆盖网络。
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一、 漏洞 CVE-2023-28842 基础信息
漏洞信息
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Vulnerability Title
moby/moby's dockerd daemon encrypted overlay network with a single endpoint is unauthenticated
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
来源: CVE Program / CVE List V5
Vulnerability Title
Moby 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Moby是一个开源项目，旨在推动软件的容器化，并帮助生态系统使容器技术主流化。 Moby 1.12版本及之后版本存在安全漏洞。攻击者利用该漏洞通过将任意以太网帧封装在VXLAN数据报中，将它们注入加密覆盖网络。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2023-28842 的公开POC
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CVE-2023-28842 厂商安全公告 (5)
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https://github.com/moby/moby/security/advisories/GHSA-vwm3-crmr-xfxw x_refsource_MISC
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https://github.com/moby/moby/security/advisories/GHSA-232p-vwff-86mp x_refsource_MISC
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https://github.com/moby/moby/security/advisories/GHSA-6wrf-mxfj-pf5p x_refsource_CONFIRM
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https://github.com/moby/moby/security/advisories/GHSA-33pg-m6jh-5237 x_refsource_MISC
CVE-2023-28842 邮件列表归档 (3)
同批安全公告 · moby · 2023-04-04 · 共 3 条
| CVE-2023-28840 | 7.5 HIGH | Moby 安全漏洞 |
| CVE-2023-28841 | 6.8 MEDIUM | Moby 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2023-28842
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