CVE - CVE-2021-43784

CVE-ID
CVE-2021-43784	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/opencontainers/runc/security/advisories/GHSA-v95c-p5hm-xq8f URL:https://github.com/opencontainers/runc/security/advisories/GHSA-v95c-p5hm-xq8f MISC:https://bugs.chromium.org/p/project-zero/issues/detail?id=2241 URL:https://bugs.chromium.org/p/project-zero/issues/detail?id=2241 MISC:https://github.com/opencontainers/runc/commit/9c444070ec7bb83995dbc0185da68284da71c554 URL:https://github.com/opencontainers/runc/commit/9c444070ec7bb83995dbc0185da68284da71c554 MISC:https://github.com/opencontainers/runc/commit/d72d057ba794164c3cce9451a00b72a78b25e1ae URL:https://github.com/opencontainers/runc/commit/d72d057ba794164c3cce9451a00b72a78b25e1ae MISC:https://github.com/opencontainers/runc/commit/f50369af4b571e358f20b139eea52d612eb55eed URL:https://github.com/opencontainers/runc/commit/f50369af4b571e358f20b139eea52d612eb55eed MLIST:[debian-lts-announce] 20211206 [SECURITY] [DLA 2841-1] runc security update URL:https://lists.debian.org/debian-lts-announce/2021/12/msg00005.html MLIST:[debian-lts-announce] 20240219 [SECURITY] [DLA 3735-1] runc security update URL:https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20211116	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20211116)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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