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Vulnerability Details : CVE-2021-41103

containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.
Publish Date : 2021-10-04 Last Update Date : 2021-11-28
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Directory traversal
CWE ID 22

- Products Affected By CVE-2021-41103

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 35 * * * Version Details Vulnerabilities
4 Application Linuxfoundation Containerd * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Fedoraproject Fedora 2
Linuxfoundation Containerd 1

- References For CVE-2021-41103

https://www.debian.org/security/2021/dsa-5002
DEBIAN DSA-5002
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/
FEDORA FEDORA-2021-b5a9a481a2
https://github.com/containerd/containerd/security/advisories/GHSA-c2h3-6mxw-7mvq CONFIRM
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/
FEDORA FEDORA-2021-df975338d4
https://github.com/containerd/containerd/commit/5b46e404f6b9f661a205e28d59c982d3634148f8

- Metasploit Modules Related To CVE-2021-41103

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


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