Sudo Local Privilege Escalation Vulnerability (CVE-2025-32463) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTAll systems running Sudo versions prior to 1.9.17p1
A local attacker can exploit the '--chroot' option to force Sudo to load a user-controlled nsswitch.conf file, leading to full root privilege escalation
Immediately upgrade Sudo to version 1.9.17p1 or later, or restrict the use of the chroot option via sudoers configuration
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Update the Sudo package to the latest patched version using your operating system's package manager.
# For Debian / Ubuntu based systems
sudo apt-get update && sudo apt-get install --only-upgrade -y sudo
# For RHEL / CentOS / Rocky Linux based systems
sudo dnf clean all && sudo dnf upgrade -y sudo2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict the use of the --chroot argument by modifying the sudoers configuration. Run visudo to safely edit the configuration file.
# Open sudoers configuration and append the following line to disable chroot usage
Defaults !use_chroot3. Log Audit & IoC Verification Commands
Verify the installed Sudo version and inspect system authentication logs for any unauthorized or suspicious use of the --chroot option.
# 1. Check the current Sudo version
sudo -V | head -n 1
# 2. Audit authentication logs for suspicious chroot execution
grep -E 'sudo.*--chroot' /var/log/auth.log /var/log/secure 2>/dev/null || echo 'No suspicious chroot usage detected.'Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-32463) is a local privilege escalation flaw in the Sudo utility caused by improper control of generation of code or resources (CWE-829) when handling the --chroot option. Sudo allows executing commands within a chroot environment; however, a flaw exists in how it processes the Name Service Switch configuration file (/etc/nsswitch.conf) before fully transitioning into the chroot jail. Sudo incorrectly references the configuration file from a user-controlled directory, allowing local users to manipulate the execution flow.
2. Exploitation Mechanics & Attack Scenario
A local attacker with low-privilege access can create a malicious directory structure containing a crafted etc/nsswitch.conf file. This malicious configuration is designed to load arbitrary shared libraries (e.g., a custom .so payload). When the attacker executes sudo --chroot pointing to this directory, Sudo (which runs with SetUID root privileges) reads the attacker-controlled nsswitch.conf and loads the specified malicious library into its high-privileged process space, executing arbitrary code as root.
3. Infrastructure & Business Impact
With a CVSS score of 7.8 (High) and active exploitation confirmed by its inclusion in the CISA KEV catalog, this vulnerability poses a severe threat to multi-tenant servers, container hosts, and enterprise Linux environments. Successful exploitation grants complete administrative control over the host operating system, bypassing security boundaries, compromising data integrity, and facilitating lateral movement within the network.
Official Vendor Advisories & References
Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf from a user-controlled directory is used with the --chroot option.
Frequently Asked SecOps Questions (CVE-2025-32463)
FAQQ1. How critical is CVE-2025-32463 and is it actively exploited in the wild?
CVE-2025-32463 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 56.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-32463?
Primary impacted vendors include sudo across sudo. Scope summary: Sudo versions prior to 1.9.17p1
Q3. What temporary mitigations or workarounds exist for CVE-2025-32463 before patching?
[Mitigation] Immediately upgrade Sudo to version 1.9.17p1 or later, or restrict the use of the chroot option via sudoers configuration Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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