SB2023052330 - Ubuntu update for runc
Published: May 23, 2023
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) 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.
2) Integer overflow (CVE-ID: CVE-2021-43784)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in netlink bytemsg length field. A remote authenticated attacker can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-29162)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to containers are incorrectly started with non-empty inheritable Linux process capabilities, which leads to security restrictions bypass and privilege escalation.
4) Improper Preservation of Permissions (CVE-ID: CVE-2023-25809)
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due to the rootless "/sys/fs/cgroup" is writable when cgroupns is not unshared. A local administrator can gain the write access to user-owned cgroup hierarchy "/sys/fs/cgroup/user.slice/..." on the host.
5) Improper access control (CVE-ID: CVE-2023-27561)
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due to improper access restrictions in the libcontainer/rootfs_linux.go. A local user can gain elevated privileges on the target system.
6) Improper Preservation of Permissions (CVE-ID: CVE-2023-28642)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improper preservation of permissions in the AppArmor and SELinux when /proc inside the container is symlinked with a specific mount configuration. A remote attacker can gain access to the target application.
Remediation
Install update from vendor's website.