一、 漏洞 CVE-2020-15257 基础信息
漏洞信息
                                        # containerd-shim API 对宿主机网络容器公开

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漏洞标题
containerd-shim API Exposed to Host Network Containers
来源：美国国家漏洞数据库 NVD
漏洞描述信息
containerd is an industry-standard container runtime and is available as a daemon for Linux and Windows. In containerd before versions 1.3.9 and 1.4.3, the containerd-shim API is improperly exposed to host network containers. Access controls for the shim’s API socket verified that the connecting process had an effective UID of 0, but did not otherwise restrict access to the abstract Unix domain socket. This would allow malicious containers running in the same network namespace as the shim, with an effective UID of 0 but otherwise reduced privileges, to cause new processes to be run with elevated privileges. This vulnerability has been fixed in containerd 1.3.9 and 1.4.3. Users should update to these versions as soon as they are released. It should be noted that containers started with an old version of containerd-shim should be stopped and restarted, as running containers will continue to be vulnerable even after an upgrade. If you are not providing the ability for untrusted users to start containers in the same network namespace as the shim (typically the "host" network namespace, for example with docker run --net=host or hostNetwork: true in a Kubernetes pod) and run with an effective UID of 0, you are not vulnerable to this issue. If you are running containers with a vulnerable configuration, you can deny access to all abstract sockets with AppArmor by adding a line similar to deny unix addr=@**, to your policy. It is best practice to run containers with a reduced set of privileges, with a non-zero UID, and with isolated namespaces. The containerd maintainers strongly advise against sharing namespaces with the host. Reducing the set of isolation mechanisms used for a container necessarily increases that container's privilege, regardless of what container runtime is used for running that container.
来源：美国国家漏洞数据库 NVD
CVSS信息
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
来源：美国国家漏洞数据库 NVD
漏洞类别
在范围间的资源转移不正确
来源：美国国家漏洞数据库 NVD
漏洞标题
containerd 安全漏洞
来源：中国国家信息安全漏洞库 CNNVD
漏洞描述信息
containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 containerd 1.3.9之前版本和1.4.3版本存在安全漏洞，该漏洞源于containerd-shim API被不正确地公开给主机网络容器。shim s API套接字的访问控制验证了连接进程的有效UID为0，但是没有限制对抽象Unix域套接字的访问。这将允许在与shim相同的网络名称空间中运行的恶意容器，其有效UID为0，但在其他方面减少了特权，从而导致使用
来源：中国国家信息安全漏洞库 CNNVD
CVSS信息
N/A
来源：中国国家信息安全漏洞库 CNNVD
漏洞类别
其他
来源：中国国家信息安全漏洞库 CNNVD
二、漏洞 CVE-2020-15257 的公开POC
# POC 描述 源链接 神龙链接
1 Proof of concept for CVE-2020-15257 in containerd. https://github.com/nccgroup/abstractshimmer POC详情
2 None https://github.com/Threekiii/Awesome-POC/blob/master/%E4%BA%91%E5%AE%89%E5%85%A8%E6%BC%8F%E6%B4%9E/Containerd%20%E6%BC%8F%E6%B4%9E%E5%AF%BC%E8%87%B4%E5%AE%B9%E5%99%A8%E9%80%83%E9%80%B8%20CVE-2020-15257.md POC详情
三、漏洞 CVE-2020-15257 的情报信息