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.

CVSS v3 9.9 CRITICAL
CVSS v2.0 9.0 HIGH

9.9^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.1 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

9.0^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:S/C:C/I:C/A:C

Exploitability : 8.0 / Impact : 10.0

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html	Exploit Third Party Advisory VDB Entry
https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/	Exploit Third Party Advisory
https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:vyos:vyos:1.1.8:*:*:*:*:*:*:*

History

20 Jan 2023, 15:28

Type	Values Removed	Values Added
References	~~(MISC) http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html -~~	(MISC) http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html - Exploit, Third Party Advisory, VDB Entry

Information

Published : 2018-12-17 19:29

Updated : 2023-12-10 12:44

NVD link : CVE-2018-18556

Mitre link : CVE-2018-18556

CVE.ORG link : CVE-2018-18556

JSON object : View

Products Affected

vyos

vyos

CWE

NVD-CWE-noinfo

{"id": "CVE-2018-18556", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 9.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "authentication": "SINGLE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 8.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.9, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.1}]}, "published": "2018-12-17T19:29:00.627", "references": [{"url": "http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}, {"url": "https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases", "tags": ["Exploit", "Vendor Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se ha descubierto un problema de escalado de privilegios en VyOS 1.1.8. La configuraci\u00f3n por defecto tambi\u00e9n permite que los usuarios operadores ejecuten el binario pppd con permisos elevados (sudo). Ciertos par\u00e1metros de entrada no se validan correctamente. Un usuario operador malicioso puede ejecutar el binario con permisos elevados y aprovechar su condici\u00f3n de validaci\u00f3n incorrecta para lanzar un shell controlado por el atacante con privilegios root."}], "lastModified": "2023-01-20T15:28:06.240", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:vyos:vyos:1.1.8:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7959038B-A2A9-49EE-9684-56209F2A7CC2"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}