CVE-2018-18556

EPSS 15.4%

Vexday Risk Score

23Low

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Functional exploit

Automatable exploit available (Nuclei/Metasploit).

CVSS —EPSS 15.4%KEV nãoPoC —Nuclei —Metasploit simPatch —

Lifecycle

05 Nov 2018Metasploit module available

17 Dec 2018Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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 products

n/a · n/a

References

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