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.
EPSS: 0.154 (96.4th percentile) — read the EPSS interpretation.
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.
Affected products
- Vyos — versions 1.1.8
- N/a — versions n/a
Public proof-of-concept exploits
References
- cve@mitre.org (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
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.