CVE-2018-18556

CRITICAL

9.9

CVSS Severity Score

EPSS Score0.1580%

EPSS Percentile17.03th

PublishedDec 17, 2018

Last ModifiedNov 21, 2024

Vulnerability 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.

Affected Platforms (CPE)

💻

Vyos

= 1.1.8

References & Advisories

🔗 http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html

🔗 https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/

🔗 https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases