CVE-2020-15257 (Medium) detected in github.com/Microsoft/hcsshim-v0.8.7

[mend-bolt-for-github[bot]]

CVE-2020-15257 - Medium Severity Vulnerability

Vulnerable Library - github.com/Microsoft/hcsshim-v0.8.7

Windows - Host Compute Service Shim

Library home page: https://proxy.golang.org/github.com/microsoft/hcsshim/@v/v0.8.7.zip

Dependency Hierarchy: - :x: **github.com/Microsoft/hcsshim-v0.8.7** (Vulnerable Library)

Found in HEAD commit: 6e30df8c07a51f900077867824d3807dffb18045

Found in base branch: master

Vulnerability Details

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.

Publish Date: 2020-12-01

URL: CVE-2020-15257

CVSS 3 Score Details (5.2)

Base Score Metrics: - Exploitability Metrics: - Attack Vector: Local - Attack Complexity: Low - Privileges Required: Low - User Interaction: None - Scope: Changed - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: Low - Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4

Release Date: 2020-12-01

Fix Resolution: v1.3.9,v1.4.3

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[mend-bolt-for-github[bot]]

:heavy_check_mark: This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[mend-bolt-for-github[bot]]

:information_source: This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.