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Splunk Windows Vulnerabilities Allow Privilege Escalation
Table of Contents
A newly disclosed high-severity flaw in Splunk for windows allows local users to escalate privileges due to incorrect file permissions applied during installation and upgrades. This impacts both Splunk Enterprise and Universal Forwarder, creating a pathway for attackers to overwrite sensitive files and gain elevated system access.
Inside the Splunk permission Flaws
The vulnerabilities CVE-2025-20386 (affecting Splunk Enterprise) and CVE-2025-20387 (affecting Splunk Universal Forwarder) originate from improper permission configurations applied by Splunk’s Windows installers. Splunk explains that the splunk Enterprise vulnerability “… lets non-administrator users on the machine access the directory and all it’s contents.”
Vulnerability Details
- CVE-2025-20386: Impacts Splunk Enterprise. Allows non-administrator users to access sensitive directories and files.
- CVE-2025-20387: Impacts Splunk Universal Forwarder. also allows unauthorized access due to incorrect permissions.
Specifically, the issue stems from the installers not correctly setting permissions, granting broader access than intended. This allows a local user, even without administrative privileges, to potentially modify critical Splunk files, leading to privilege escalation.
Impact of Exploitation
Prosperous exploitation of these vulnerabilities could allow an attacker to:
- Gain elevated system access.
- overwrite sensitive configuration files.
- Potentially compromise the entire Splunk deployment.
Mitigation and Patching
Splunk has released patches to address these vulnerabilities. Users are strongly advised to upgrade to the latest versions of Splunk Enterprise and Universal Forwarder as soon as possible.
Recommended Actions:
- Review Splunk’s security advisory for detailed facts and specific patch versions.
- Apply the recommended updates to both Splunk Enterprise and Universal forwarder instances.
- Monitor systems for any signs of suspicious activity.
FAQ
Q: What versions of Splunk are affected?
A: All versions of Splunk Enterprise and Universal Forwarder for Windows prior to the patched versions are affected. Refer to the Splunk advisory for a complete list.
Q: Is remote exploitation possible?
A: No, these vulnerabilities require local access to the system.
Q: What is the severity of these vulnerabilities?
A: Splunk rates these as high-severity vulnerabilities due to the potential for privilege escalation.
Key Takeaways
- Splunk for Windows is affected by privilege escalation vulnerabilities.
- The root cause is incorrect file permissions during installation and upgrades.
- Immediate patching is crucial to mitigate the risk.
- Regularly review Splunk security advisories for updates.