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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vyos | Vyos | 1.1.8 |
References
- http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-PrivileExploitThird Party AdvisoryVDB Entry
- https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-suExploitThird Party Advisory
- https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-iExploitVendor Advisory
- http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-PrivileExploitThird Party AdvisoryVDB Entry
- https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-suExploitThird Party Advisory
- https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-iExploitVendor Advisory
FAQ
What is CVE-2018-18556?
CVE-2018-18556 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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 ar...
How severe is CVE-2018-18556?
CVE-2018-18556 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2018-18556?
Check the references section above for vendor advisories and patch information. Affected products include: Vyos Vyos.