SB2021043028 - SUSE update for containerd, docker, runc
Published: April 30, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 9 secuirty vulnerabilities.
1) Command injection (CVE-ID: CVE-2018-16873)
The vulnerability allows a remote attacker to execute arbitrary commands on the target system.
The vulnerability exists in the go get command due to import path of a malicious Go package, or a package that imports it directly or indirectly. A remote unauthenticated attacker can use a vanity import path that ends with "/.git", use custom domains to arrange things so that a Git repository is cloned to a folder named ".git", trick the victim into considering the parent directory as a repository root, and run Git commands on it that will use the "config" file in the original Git repository root for its configuration, and if that config file contains malicious commands, and execute arbitrary code on the system running "go get -u".
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Path traversal (CVE-ID: CVE-2018-16874)
The vulnerability allows a remote attacker to conduct a directory traversal attack on the target system.
The vulnerability exists in the go get command due to path traversal attack when the affected software executes the go get command with the import path of a Go package that contains curly braces. A remote unauthenticated attacker can execute the go get command, trick the victim into accessing a Go package that submits malicious input, conduct a directory traversal attack, which the attacker can use to execute arbitrary code with elevated privileges.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Improper input validation (CVE-ID: CVE-2018-16875)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists on Go TLS servers accepting client certificates and TLS clients due to the crypto/x509 package does not limit the amount of work performed for each chain verification. A remote unauthenticated attacker can craft pathological inputs leading to a CPU denial of service.
4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-16884)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to incorrect checking of the mount targets in libcontainer/rootfs_linux.go in runc. A local user can bypass AppArmor restrictions and perform unauthorized actions on the system, as demonstrated by overwriting the /proc directory with a malicious Doker image.
5) Improper access control (CVE-ID: CVE-2019-19921)
The vulnerability allows a local user to gain unauthorized access to sensitive information.
The vulnerability exists due to improper access restrictions, related to libcontainer/rootfs_linux.go in runc. A local user with ability to spawn two containers with custom volume-mount configurations, and run custom images can escalate privileges on the system.
6) Privilege escalation (CVE-ID: CVE-2019-5736)
The vulnerability allows a remote attacker to gain elevated privileges.The weakness exists in the runc container runtime due to file-descriptor mishandling, related to /proc/self/exe. A remote attacker can leverage the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec, overwrite the host runc binary with minimal user interaction and execute arbitrary code with root privileges.
Successful exploitation of the vulnerability may result in system compromise.
7) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-21284)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions when using the --userns-remap option. A remote authenticated attacker on the local network can send a specially crafted request and gain elevated privileges as root on the system.
8) Resource exhaustion (CVE-ID: CVE-2021-21285)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trick a victim to pull a specially crafted Docker image, trigger resource exhaustion and perform a denial of service (DoS) attack.
9) Resource management error (CVE-ID: CVE-2021-21334)
The vulnerability allows an attacker to gain access to potentially sensitive information.
The vulnerability exists due to incorrect management of internal resources. Containers launched through containerd's CRI implementation (through Kubernetes, crictl, or any other pod/container client that uses the containerd CRI service) that share the same image may receive incorrect environment variables, including values that are defined for other containers. If the affected containers have different security contexts, this may allow sensitive information to be unintentionally shared.Remediation
Install update from vendor's website.