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CVE-2018-18556

9.9 · CRITICAL

A privilege escalation issue was discovered in VyOS 1.1.8.

Published Dec 17, 2018EPSS 15.41%

Overview

CVE-2018-18556 is a critical-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

Refpacketstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.htmlRefblog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/Refblog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releasesRefpacketstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.htmlRefblog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/Refblog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases

How CyberStrike helps

Frequently asked questions

What is CVE-2018-18556?

CVE-2018-18556 is a critical-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-18556 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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