THREATPORT/VULNERABILITY/CVE-2018-18556
CRITICAL SEVERITY

CVE-2018-18556

Vyos vulnerability

CVSS
9.9
EPSS
15.4%
EPSS pct
96th
Exploited
No known
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 vendor
Vyos
Affected product
Vyos
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2018-12-17

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 15.4% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2018-18556

  • Confirm whether Vyos Vyos is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2018-18556.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-18556

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