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Vulnerability Details : CVE-2020-15257

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 [email protected]**, 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 Last Update Date : 2021-05-26
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- CVSS Scores & Vulnerability Types

CVSS Score
3.6
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 None (There is no impact to the availability of the system.)
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) Gain privileges
CWE ID 669

- Products Affected By CVE-2020-15257

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
3 Application Linuxfoundation Containerd * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

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

- References For CVE-2020-15257

https://www.debian.org/security/2021/dsa-4865
DEBIAN DSA-4865
https://security.gentoo.org/glsa/202105-33
GENTOO GLSA-202105-33
https://lists.fedoraproject.org/archives/list/[email protected]/message/LNKXLOLZWO5FMAPX63ZL7JNKTNNT5NQD/
FEDORA FEDORA-2020-baeb8dbaea
https://github.com/containerd/containerd/releases/tag/v1.4.3
https://github.com/containerd/containerd/security/advisories/GHSA-36xw-fx78-c5r4 CONFIRM
https://github.com/containerd/containerd/commit/4a4bb851f5da563ff6e68a83dc837c7699c469ad

- Metasploit Modules Related To CVE-2020-15257

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


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