CVE-2018-18556
9.9 · CRITICALOverview
CVE-2018-18556 is a critical-severity vulnerability affecting vyos vyos. It was published on December 17, 2018 and has a CVSS 3.1 base score of 9.9 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.
Remediation
Check the references section for vendor advisories and patches from vyos. Update vyos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
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References
Frequently Asked Questions
What is CVE-2018-18556?
CVE-2018-18556 is a critical-severity vulnerability affecting vyos vyos. It was published on December 17, 2018 and has a CVSS 3.1 base score of 9.9 (CRITICAL).
How severe is CVE-2018-18556?
This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2018-18556?
Check the references section for vendor advisories and patches from vyos. Update vyos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2018-18556?
CyberStrike's AI-powered security agents can automatically detect CVE-2018-18556 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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