CVE-2023-0179

Published: 13 January 2023

A buffer overflow vulnerability was found in the Netfilter subsystem in the Linux Kernel. This issue could allow the leakage of both stack and heap addresses, and potentially allow Local Privilege Escalation to the root user via arbitrary code execution.

From the Ubuntu Security Team

Davide Ornaghi discovered that the netfilter subsystem in the Linux kernel did not properly handle VLAN headers in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Mitigation

If not needed, disable the ability for unprivileged users
to create namespaces. To do this temporarily, do:
  sudo sysctl -w kernel.unprivileged_userns_clone=0
To disable across reboots, do:
  echo kernel.unprivileged_userns_clone=0 | \
  sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0179
• https://www.openwall.com/lists/oss-security/2023/01/13/2
• https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230111212251.193032-4-pablo@netfilter.org/
• https://ubuntu.com/security/notices/USN-5856-1
• https://ubuntu.com/security/notices/USN-5857-1
• https://ubuntu.com/security/notices/USN-5858-1
• https://ubuntu.com/security/notices/USN-5859-1
• https://ubuntu.com/security/notices/USN-5911-1
• https://ubuntu.com/security/notices/USN-5912-1
• https://ubuntu.com/security/notices/USN-5915-1
• https://ubuntu.com/security/notices/USN-5929-1
• https://ubuntu.com/security/notices/USN-5935-1
• https://ubuntu.com/security/notices/USN-5938-1
• https://ubuntu.com/security/notices/USN-5941-1
• https://ubuntu.com/security/notices/USN-5950-1
• https://ubuntu.com/security/notices/USN-5962-1
• NVD
• Launchpad
• Debian