Patch
CVE-2023-32629
with vRx
Vulnerability Overview
CVE Name
CVE-2023-32629
Severity
7.8
High
CVE Description
Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels
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Script
Script Type
Remediation script
Mitigation & detection
Taking advantage of these vulnerabilities necessitates the establishment of a user namespace and an OverlayFS mount. This implies that an attacker would need local code execution capabilities on the targeted system, making remote exploitation seem improbable.
Ubuntu released fixed versions for the impacted kernels (see the list above). It's crucial for Ubuntu users who are affected to upgrade to these newer versions. For those unable to upgrade their kernel, there's an alternative solution: restrict the user namespace usage to users with limited privileges to stop potential exploitation.
To enforce this, execute the following command:
sudo sysctl -w kernel.unprivileged_userns_clone=0
For those wanting this change to persist after the system restarts, use this command:
echo kernel.unprivileged_userns_clone=0 | \
sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf
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Affected OS & Apps
Ubuntu Linux
by
Canonical
Ubuntu
by
Ubuntu
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4.8
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