Vulnerability in Vyos
CVE-2018-18556
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.154 (96.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.154 · newest: 0.154 · change: 0.000
Affected products
- Vyos — versions 1.1.8
Public proof-of-concept exploits
References
- blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-n… (Exploit, Vendor Advisory)
- blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd… (Exploit, Third Party Advisory)
- packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Esc… (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-18556?
- CVE-2018-18556 is a critical-severity vulnerability in Vyos. CVSS score: 9.9/10. Published 2018-12-17.
- How severe is CVE-2018-18556?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2018-18556 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.