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Vulnerability Details : CVE-2021-43784

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 Last Update Date : 2021-12-08
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- CVSS Scores & Vulnerability Types

CVSS Score
6.0
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication ???
Gained Access None
Vulnerability Type(s) OverflowBypass a restriction or similar
CWE ID 190

- Products Affected By CVE-2021-43784

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 Application Linuxfoundation Runc * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Linuxfoundation Runc 1

- References For CVE-2021-43784

https://bugs.chromium.org/p/project-zero/issues/detail?id=2241
https://lists.debian.org/debian-lts-announce/2021/12/msg00005.html
MLIST [debian-lts-announce] 20211206 [SECURITY] [DLA 2841-1] runc security update
https://github.com/opencontainers/runc/security/advisories/GHSA-v95c-p5hm-xq8f CONFIRM
https://github.com/opencontainers/runc/commit/f50369af4b571e358f20b139eea52d612eb55eed
https://github.com/opencontainers/runc/commit/9c444070ec7bb83995dbc0185da68284da71c554
https://github.com/opencontainers/runc/commit/d72d057ba794164c3cce9451a00b72a78b25e1ae

- Metasploit Modules Related To CVE-2021-43784

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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