USN-6088-2

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USN-6088-2

Summary: runc vulnerabilities

Details: USN-6088-1 fixed vulnerabilities in runC. This update provides the corresponding updates for Ubuntu 16.04 LTS. It was discovered that runC incorrectly performed access control when mounting /proc to non-directories. An attacker could possibly use this issue to escalate privileges. (CVE-2019-19921) Felix Wilhelm discovered that runC incorrecly handled netlink messages. An attacker could possibly use this issue to escalate privileges. (CVE-2021-43784) Andrew G. Morgan discovered that runC incorrectly set inherited process capabilities inside the container. An attacker could possibly use this issue to escalate privileges. (CVE-2022-29162) Original advisory details: It was discovered that runC incorrectly made /sys/fs/cgroup writable when in rootless mode. An attacker could possibly use this issue to escalate privileges. (CVE-2023-25809) It was discovered that runC incorrectly performed access control when mounting /proc to non-directories. An attacker could possibly use this issue to escalate privileges. (CVE-2023-27561) It was discovered that runC incorrectly handled /proc and /sys mounts inside a container. An attacker could possibly use this issue to bypass AppArmor, and potentially SELinux. (CVE-2023-28642)

References: https://ubuntu.com/security/notices/USN-6088-2, https://ubuntu.com/security/CVE-2019-19921, https://ubuntu.com/security/CVE-2021-43784, https://ubuntu.com/security/CVE-2022-29162, https://ubuntu.com/security/CVE-2023-25809, https://ubuntu.com/security/CVE-2023-27561, https://ubuntu.com/security/CVE-2023-28642