SB2022092037 - SUSE update for libcontainers-common
Published: September 20, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2020-14370)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way application processes environment variables with deprecated Varlink API or the Docker-compatible REST API. If multiple containers are created in a short duration, the environment variables from the first container gets leaked into subsequent containers. A remote user with control over the subsequent containers could use this flaw to gain access to sensitive information stored in such variables.
2) Insufficiently protected credentials (CVE-ID: CVE-2020-15157)
The vulnerability allows a remote attacker to gain access to sensitive information.
If a container image manifest in the OCI Image format or Docker Image V2 Schema 2 format includes a URL for the location of a specific image layer (otherwise known as a “foreign layer”), the default containerd resolver will follow that URL to attempt to download it. In v1.2.x the default containerd resolver will provide its authentication credentials if the server where the URL is located presents an HTTP 401 status code along with registry-specific HTTP headers.
If an attacker publishes a public image with a manifest that directs one of the layers to be fetched from a web server they control and they trick a user or system into pulling the image, they can obtain the credentials used for pulling that image. In some cases, this may be the user's username and password for the registry. In other cases, this may be the credentials attached to the cloud virtual instance which can grant access to other cloud resources in the account.
The default containerd resolver is used by the cri-containerd plugin (which can be used by Kubernetes), the ctr development tool, and other client programs that have explicitly linked against it.
3) Origin validation error (CVE-ID: CVE-2021-20199)
The vulnerability allows a remote attacker to bypass security restrictions.
The vulnerability exists due to missing authentication when connecting from all sources. A remote attacker can send a specially crafted request and bypass access restrictions to containerized applications.
4) Improper locking (CVE-ID: CVE-2021-20291)
The vulnerability allows a local user to perform a denial of service attack (DoS) on the target system.
The vulnerability exists due to double-locking error. When a container image is processed, each layer is unpacked using `tar`. If one of those layers is not a valid `tar` archive this causes an error leading to an unexpected situation where the code indefinitely waits for the tar unpacked stream, which never finishes. An attacker could use this vulnerability to craft a malicious image, which when downloaded and stored by an application using containers/storage, would then cause a deadlock leading to a Denial of Service (DoS).
5) Information disclosure (CVE-ID: CVE-2021-3602)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to podman build command with the --isolation chroot flag includes environment variables from the host. A remote attacker with access to the container can obtain sensitive information from environment variables.
Remediation
Install update from vendor's website.