CVE-2021-43784 (Medium) detected in github.com/opencontainers/runc-v1.0.0-rc10

[mend-for-github-com[bot]]

CVE-2021-43784 - Medium Severity Vulnerability

Vulnerable Library - github.com/opencontainers/runc-v1.0.0-rc10

CLI tool for spawning and running containers according to the OCI specification

Library home page: https://proxy.golang.org/github.com/opencontainers/runc/@v/v1.0.0-rc10.zip

Dependency Hierarchy: - :x: **github.com/opencontainers/runc-v1.0.0-rc10** (Vulnerable Library)

Found in base branch: master

Vulnerability Details

runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc, netlink is used internally as a serialization system for specifying the relevant container configuration to the `C` portion of the code (responsible for the based namespace setup of containers). In all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte array attribute could result in the length overflowing and the attribute contents being parsed as netlink messages for container configuration. This vulnerability requires the attacker to have some control over the configuration of the container and would allow the attacker to bypass the namespace restrictions of the container by simply adding their own netlink payload which disables all namespaces. The main users impacted are those who allow untrusted images with untrusted configurations to run on their machines (such as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one may try disallowing untrusted namespace paths from your container. It should be noted that untrusted namespace paths would allow the attacker to disable namespace protections entirely even in the absence of this bug.

Publish Date: 2021-12-06

URL: CVE-2021-43784

CVSS 3 Score Details (5.0)

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/opencontainers/runc/security/advisories/GHSA-v95c-p5hm-xq8f

Release Date: 2021-12-06

Fix Resolution: v1.0.3

[mend-for-github-com[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-for-github-com[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.