Detections
Analytics
Oracle Linux 7 : containerd (ELSA-2020-5964)
medium Nessus Plugin ID 143451
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Synopsis
The remote Oracle Linux host is missing a security update.Description
The remote Oracle Linux 7 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2020-5964 advisory.- 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 shims 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 addr=@**, 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. (CVE-2020-15257)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected containerd package.See Also
Plugin Details
Severity: Medium
ID: 143451
File Name: oraclelinux_ELSA-2020-5964.nasl
Version: 1.4
Type: local
Agent: unix
Published: 12/3/2020
Updated: 2/7/2024
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.8
CVSS v2
Risk Factor: Low
Base Score: 3.6
Temporal Score: 2.8
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2020-15257
CVSS v3
Risk Factor: Medium
Base Score: 5.2
Temporal Score: 4.7
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:oracle:linux:7, p-cpe:/a:oracle:linux:containerd
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/OracleLinux
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 12/3/2020
Vulnerability Publication Date: 11/20/2020
Reference Information
CVE: CVE-2020-15257