CVE-2021-41282

diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.

CVSS v3 8.8 HIGH
CVSS v2.0 9.0 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

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/166208/pfSense-2.5.2-Shell-Upload.html	Exploit Third Party Advisory VDB Entry
https://docs.netgate.com/pfsense/en/latest/releases/22-01_2-6-0.html	Release Notes Third Party Advisory
https://www.shielder.it/advisories/	Third Party Advisory
https://www.shielder.it/advisories/pfsense-remote-command-execution/	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:pfsense:pfsense:2.5.2:*:*:*:*:*:*:*

History

No history.

Information

Published : 2022-03-01 23:15

Updated : 2024-02-28 19:09

NVD link : CVE-2021-41282

Mitre link : CVE-2021-41282

CVE.ORG link : CVE-2021-41282

JSON object : View

Products Affected

pfsense

pfsense

CWE

CWE-74

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

{"id": "CVE-2021-41282", "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": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "published": "2022-03-01T23:15:08.347", "references": [{"url": "http://packetstormsecurity.com/files/166208/pfSense-2.5.2-Shell-Upload.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}, {"url": "https://docs.netgate.com/pfsense/en/latest/releases/22-01_2-6-0.html", "tags": ["Release Notes", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.shielder.it/advisories/", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.shielder.it/advisories/pfsense-remote-command-execution/", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-74"}]}], "descriptions": [{"lang": "en", "value": "diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location."}, {"lang": "es", "value": "El archivo diag_routes.php en pfSense versi\u00f3n 2.5.2, permite una inyecci\u00f3n de datos sed. Es pretendido que usuarios autenticados puedan visualizar los datos sobre las rutas establecidas en el firewall. Los datos son recuperados al ejecutar la utilidad netstat, y luego su salida es analizada por medio de la utilidad sed. Aunque son usados los mecanismos comunes de protecci\u00f3n contra la inyecci\u00f3n de comandos (es decir, el uso de la funci\u00f3n escapeshellarg para los argumentos), todav\u00eda es posible inyectar c\u00f3digo espec\u00edfico de sed y escribir un archivo arbitrario en una ubicaci\u00f3n arbitraria"}], "lastModified": "2022-07-12T17:42:04.277", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:pfsense:pfsense:2.5.2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AC1E93C2-8917-4E57-9607-ADA2F78F2BA5"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}